update changelog for release v0.2.2-alpha [no ci]

* allow per-episode folders in local show libraries

* fix subfolder etag generation

CHANGELOG.md

@@ -5,6 +5,52 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+## [0.2.2-alpha] - 2021-10-30
+### Fixed
+- Fix EPG entries for Duration schedule items that play multiple items
+- Fix EPG entries for Multiple schedule items that play more than one item
+
+### Added
+- Add fallback filler settings to Channel and global FFmpeg Settings
+  - When streaming is attempted during an unscheduled gap, the resulting video will be determined using the following priority:
+    - Channel fallback filler
+    - Global fallback filler
+    - Generated `Channel Is Offline` error message video 
+
+### Changed
+- Allow per-episode folders for local show libraries
+  - e.g. `Show Name\Season #\Episode #\Show Name - s#e#.mkv`
+
+## [0.2.1-alpha] - 2021-10-24
+### Fixed
+- Fix saving dynamic start time on schedule items
+
+## [0.2.0-alpha] - 2021-10-23
+### Fixed
+- Fix generated streams with mpeg2video
+- Fix incorrect row count in playout detail table
+- Fix deleting movies that have been removed from Jellyfin and Emby
+- Fix bug that caused large unscheduled gaps in playouts
+  - This was caused by schedule items with a fixed start of midnight
+
+### Added
+- Add new filler system
+    - `Pre-Roll Filler` plays before each media item
+    - `Mid-Roll Filler` plays between media item chapters
+    - `Post-Roll Filler` plays after each media item
+    - `Tail Filler` plays after all media items, until the next media item
+    - `Fallback Filler` loops instead of default offline image to fill any remaining gaps
+- Store chapter details with media statistics; this is needed to support mid-roll filler
+    - This requires re-ingesting statistics for all media items the first time this version is launched
+- Add switch to show/hide filler in playout detail table
+- Add `minutes` field to search index
+  - This requires rebuilding the search index and search results may be empty or incomplete until the rebuild is complete
+
+### Changed
+- Change some debug log messages to info so they show by default again
+- Remove tail collection options from `Duration` playout mode
+- Show localized start time in schedule items tables
+
 ## [0.1.5-alpha] - 2021-10-18
 ### Fixed
 - Fix double scheduling; this could happen if the app was shutdown during a playout build
@@ -12,13 +58,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Fix updating Jellyfin and Emby artwork
 - Fix Plex, Jellyfin, Emby worker crash attempting to sync library that no longer exists
 - Fix bug with `Duration` mode scheduling when media items are too long to fit in the requested duration
-- Fix bug with `Duration` mode scheduling with `Filler` tail mode where other duration items in the schedule would be skipped
 
 ### Added
 - Include music video thumbnails in channel guide (xmltv)
 
 ### Changed
 - Automatically find working Plex address on startup
+- Automatically select schedule item in schedules that contain only one item
 - Change default log level from `Debug` to `Information`
   - The `Debug` log level can be enabled in the `appsettings.json` file for non-docker installs
   - The `Debug` log level can be enabled by setting the environment variable `Serilog:MinimumLevel=Debug` for docker installs
@@ -730,7 +776,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Initial release to facilitate testing outside of Docker.
 
 
-[Unreleased]: https://github.com/jasongdove/ErsatzTV/compare/v0.1.5-alpha...HEAD
+[Unreleased]: https://github.com/jasongdove/ErsatzTV/compare/v0.2.1-alpha...HEAD
+[0.2.1-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.2.0-alpha...v0.2.1-alpha
+[0.2.0-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.1.5-alpha...v0.2.0-alpha
 [0.1.5-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.1.4-alpha...v0.1.5-alpha
 [0.1.4-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.1.3-alpha...v0.1.4-alpha
 [0.1.3-alpha]: https://github.com/jasongdove/ErsatzTV/compare/v0.1.2-alpha...v0.1.3-alpha

ErsatzTV.Application/Channels/ChannelViewModel.cs

@@ -10,5 +10,6 @@ namespace ErsatzTV.Application.Channels
         string Logo,
         string PreferredLanguageCode,
         StreamingMode StreamingMode,
-        int? WatermarkId);
+        int? WatermarkId,
+        int? FallbackFillerId);
 }

ErsatzTV.Application/Channels/Commands/CreateChannel.cs

@@ -13,5 +13,6 @@ namespace ErsatzTV.Application.Channels.Commands
         string Logo,
         string PreferredLanguageCode,
         StreamingMode StreamingMode,
-        int? WatermarkId) : IRequest<Either<BaseError, CreateChannelResult>>;
+        int? WatermarkId,
+        int? FallbackFillerId) : IRequest<Either<BaseError, CreateChannelResult>>;
 }

ErsatzTV.Application/Channels/Commands/CreateChannelHandler.cs

@@ -7,6 +7,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
 using ErsatzTV.Infrastructure.Data;
 using ErsatzTV.Infrastructure.Extensions;
 using LanguageExt;
@@ -42,9 +43,10 @@ namespace ErsatzTV.Application.Channels.Commands
             (ValidateName(request), await ValidateNumber(dbContext, request),
                 await FFmpegProfileMustExist(dbContext, request),
                 ValidatePreferredLanguage(request),
-                await WatermarkMustExist(dbContext, request))
+                await WatermarkMustExist(dbContext, request),
+                await FillerPresetMustExist(dbContext, request))
             .Apply(
-                (name, number, ffmpegProfileId, preferredLanguageCode, watermarkId) =>
+                (name, number, ffmpegProfileId, preferredLanguageCode, watermarkId, fillerPresetId) =>
                 {
                     var artwork = new List<Artwork>();
                     if (!string.IsNullOrWhiteSpace(request.Logo))
@@ -74,6 +76,11 @@ namespace ErsatzTV.Application.Channels.Commands
                         channel.WatermarkId = id;
                     }
 
+                    foreach (int id in fillerPresetId)
+                    {
+                        channel.FallbackFillerId = id;
+                    }
+
                     return channel;
                 });
 
@@ -131,5 +138,25 @@ namespace ErsatzTV.Application.Channels.Commands
                 .MapT(_ => Optional(createChannel.WatermarkId))
                 .Map(o => o.ToValidation<BaseError>($"Watermark {createChannel.WatermarkId} does not exist."));
         }
+
+        private static async Task<Validation<BaseError, Option<int>>> FillerPresetMustExist(
+            TvContext dbContext,
+            CreateChannel createChannel)
+        {
+            if (createChannel.FallbackFillerId is null)
+            {
+                return Option<int>.None;
+            }
+
+            return await dbContext.FillerPresets
+                .Filter(fp => fp.FillerKind == FillerKind.Fallback)
+                .CountAsync(w => w.Id == createChannel.FallbackFillerId)
+                .Map(Optional)
+                .Filter(c => c > 0)
+                .MapT(_ => Optional(createChannel.FallbackFillerId))
+                .Map(
+                    o => o.ToValidation<BaseError>(
+                        $"Fallback filler {createChannel.FallbackFillerId} does not exist."));
+        }
     }
 }

ErsatzTV.Application/Channels/Commands/UpdateChannel.cs

@@ -14,5 +14,6 @@ namespace ErsatzTV.Application.Channels.Commands
         string Logo,
         string PreferredLanguageCode,
         StreamingMode StreamingMode,
-        int? WatermarkId) : IRequest<Either<BaseError, ChannelViewModel>>;
+        int? WatermarkId,
+        int? FallbackFillerId) : IRequest<Either<BaseError, ChannelViewModel>>;
 }

ErsatzTV.Application/Channels/Commands/UpdateChannelHandler.cs

@@ -67,6 +67,7 @@ namespace ErsatzTV.Application.Channels.Commands
             
             c.StreamingMode = update.StreamingMode;
             c.WatermarkId = update.WatermarkId;
+            c.FallbackFillerId = update.FallbackFillerId;
             await dbContext.SaveChangesAsync();
             return ProjectToViewModel(c);
         }

ErsatzTV.Application/Channels/Mapper.cs

@@ -15,7 +15,8 @@ namespace ErsatzTV.Application.Channels
                 GetLogo(channel),
                 channel.PreferredLanguageCode,
                 channel.StreamingMode,
-                channel.WatermarkId);
+                channel.WatermarkId,
+                channel.FallbackFillerId);
 
         private static string GetLogo(Channel channel) =>
             Optional(channel.Artwork.FirstOrDefault(a => a.ArtworkKind == ArtworkKind.Logo))

ErsatzTV.Application/Configuration/Commands/UpdateLibraryRefreshIntervalHandler.cs

@@ -25,7 +25,7 @@ namespace ErsatzTV.Application.Configuration.Commands
 
         private static Task<Validation<BaseError, Unit>> Validate(UpdateLibraryRefreshInterval request) =>
             Optional(request.LibraryRefreshInterval)
-                .Filter(lri => lri > 0)
+                .Where(lri => lri > 0)
                 .Map(_ => Unit.Default)
                 .ToValidation<BaseError>("Tuner count must be greater than zero")
                 .AsTask();

ErsatzTV.Application/Configuration/Commands/UpdatePlayoutDaysToBuildHandler.cs

@@ -58,7 +58,7 @@ namespace ErsatzTV.Application.Configuration.Commands
 
         private static Task<Validation<BaseError, Unit>> Validate(UpdatePlayoutDaysToBuild request) =>
             Optional(request.DaysToBuild)
-                .Filter(days => days > 0)
+                .Where(days => days > 0)
                 .Map(_ => Unit.Default)
                 .ToValidation<BaseError>("Days to build must be greater than zero")
                 .AsTask();

ErsatzTV.Application/Emby/Commands/SynchronizeEmbyLibrariesHandler.cs

@@ -67,7 +67,7 @@ namespace ErsatzTV.Application.Emby.Commands
         {
             EmbySecrets secrets = await _embySecretStore.ReadSecrets();
             return Optional(secrets.Address == connectionParameters.ActiveConnection.Address)
-                .Filter(match => match)
+                .Where(match => match)
                 .Map(_ => connectionParameters with { ApiKey = secrets.ApiKey })
                 .ToValidation<BaseError>("Emby media source requires an api key");
         }

ErsatzTV.Application/Emby/Commands/SynchronizeEmbyLibraryByIdHandler.cs

@@ -142,7 +142,7 @@ namespace ErsatzTV.Application.Emby.Commands
         {
             EmbySecrets secrets = await _embySecretStore.ReadSecrets();
             return Optional(secrets.Address == connectionParameters.ActiveConnection.Address)
-                .Filter(match => match)
+                .Where(match => match)
                 .Map(_ => connectionParameters with { ApiKey = secrets.ApiKey })
                 .ToValidation<BaseError>("Emby media source requires an api key");
         }

ErsatzTV.Application/FFmpegProfiles/Commands/UpdateFFmpegSettingsHandler.cs

@@ -115,6 +115,17 @@ namespace ErsatzTV.Application.FFmpegProfiles.Commands
                 await _configElementRepository.Delete(ConfigElementKey.FFmpegGlobalWatermarkId);
             }
 
+            if (request.Settings.GlobalFallbackFillerId is not null)
+            {
+                await _configElementRepository.Upsert(
+                    ConfigElementKey.FFmpegGlobalFallbackFillerId,
+                    request.Settings.GlobalFallbackFillerId.Value);
+            }
+            else
+            {
+                await _configElementRepository.Delete(ConfigElementKey.FFmpegGlobalFallbackFillerId);
+            }
+
             await _configElementRepository.Upsert(
                 ConfigElementKey.FFmpegSegmenterTimeout,
                 request.Settings.HlsSegmenterIdleTimeout);

ErsatzTV.Application/FFmpegProfiles/FFmpegSettingsViewModel.cs

@@ -8,6 +8,7 @@
         public string PreferredLanguageCode { get; set; }
         public bool SaveReports { get; set; }
         public int? GlobalWatermarkId { get; set; }
+        public int? GlobalFallbackFillerId { get; set; }
         public int HlsSegmenterIdleTimeout { get; set; }
         public int WorkAheadSegmenterLimit { get; set; }
     }

ErsatzTV.Application/FFmpegProfiles/Queries/GetFFmpegSettingsHandler.cs

@@ -28,6 +28,8 @@ namespace ErsatzTV.Application.FFmpegProfiles.Queries
                 await _configElementRepository.GetValue<string>(ConfigElementKey.FFmpegPreferredLanguageCode);
             Option<int> watermark =
                 await _configElementRepository.GetValue<int>(ConfigElementKey.FFmpegGlobalWatermarkId);
+            Option<int> fallbackFiller =
+                await _configElementRepository.GetValue<int>(ConfigElementKey.FFmpegGlobalFallbackFillerId);
             Option<int> hlsSegmenterIdleTimeout =
                 await _configElementRepository.GetValue<int>(ConfigElementKey.FFmpegSegmenterTimeout);
             Option<int> workAheadSegmenterLimit =
@@ -49,6 +51,11 @@ namespace ErsatzTV.Application.FFmpegProfiles.Queries
                 result.GlobalWatermarkId = watermarkId;
             }
 
+            foreach (int fallbackFillerId in fallbackFiller)
+            {
+                result.GlobalFallbackFillerId = fallbackFillerId;
+            }
+
             return result;
         }
     }

ErsatzTV.Application/Filler/Commands/CreateFillerPreset.cs

@@ -0,0 +1,24 @@
+using System;
+using ErsatzTV.Core;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
+using LanguageExt;
+using MediatR;
+using Unit = LanguageExt.Unit;
+
+namespace ErsatzTV.Application.Filler.Commands
+{
+    public record CreateFillerPreset(
+        string Name,
+        FillerKind FillerKind,
+        FillerMode FillerMode,
+        TimeSpan? Duration,
+        int? Count,
+        int? PadToNearestMinute,
+        ProgramScheduleItemCollectionType CollectionType,
+        int? CollectionId,
+        int? MediaItemId,
+        int? MultiCollectionId,
+        int? SmartCollectionId
+    ) : IRequest<Either<BaseError, Unit>>;
+}

ErsatzTV.Application/Filler/Commands/CreateFillerPresetHandler.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Core;
+using ErsatzTV.Core.Domain.Filler;
+using ErsatzTV.Infrastructure.Data;
+using LanguageExt;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using Unit = LanguageExt.Unit;
+
+namespace ErsatzTV.Application.Filler.Commands
+{
+    public class CreateFillerPresetHandler : IRequestHandler<CreateFillerPreset, Either<BaseError, Unit>>
+    {
+        private readonly IDbContextFactory<TvContext> _dbContextFactory;
+
+        public CreateFillerPresetHandler(IDbContextFactory<TvContext> dbContextFactory)
+        {
+            _dbContextFactory = dbContextFactory;
+        }
+
+        public async Task<Either<BaseError, Unit>> Handle(CreateFillerPreset request, CancellationToken cancellationToken)
+        {
+            try
+            {
+                await using TvContext dbContext = _dbContextFactory.CreateDbContext();
+
+                var fillerPreset = new FillerPreset
+                {
+                    Name = request.Name,
+                    FillerKind = request.FillerKind,
+                    FillerMode = request.FillerMode,
+                    Duration = request.Duration,
+                    Count = request.Count,
+                    PadToNearestMinute = request.PadToNearestMinute,
+                    CollectionType = request.CollectionType,
+                    CollectionId = request.CollectionId,
+                    MediaItemId = request.MediaItemId,
+                    MultiCollectionId = request.MultiCollectionId,
+                    SmartCollectionId = request.SmartCollectionId
+                };
+
+                await dbContext.FillerPresets.AddAsync(fillerPreset, cancellationToken);
+                await dbContext.SaveChangesAsync(cancellationToken);
+
+                return Unit.Default;
+            }
+            catch (Exception ex)
+            {
+                return BaseError.New(ex.Message);
+            }
+        }
+    }
+}

ErsatzTV.Application/Filler/Commands/DeleteFillerPreset.cs

@@ -0,0 +1,8 @@
+using ErsatzTV.Core;
+using LanguageExt;
+using MediatR;
+
+namespace ErsatzTV.Application.Filler.Commands
+{
+    public record DeleteFillerPreset(int FillerPresetId) : IRequest<Either<BaseError, LanguageExt.Unit>>;
+}

ErsatzTV.Application/Filler/Commands/DeleteFillerPresetHandler.cs

@@ -0,0 +1,43 @@
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Core;
+using ErsatzTV.Core.Domain.Filler;
+using ErsatzTV.Infrastructure.Data;
+using ErsatzTV.Infrastructure.Extensions;
+using LanguageExt;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using Unit = LanguageExt.Unit;
+
+namespace ErsatzTV.Application.Filler.Commands
+{
+    public class DeleteFillerPresetHandler : IRequestHandler<DeleteFillerPreset, Either<BaseError, Unit>>
+    {
+        private readonly IDbContextFactory<TvContext> _dbContextFactory;
+
+        public DeleteFillerPresetHandler(IDbContextFactory<TvContext> dbContextFactory) =>
+            _dbContextFactory = dbContextFactory;
+
+        public async Task<Either<BaseError, Unit>> Handle(
+            DeleteFillerPreset request,
+            CancellationToken cancellationToken)
+        {
+            await using TvContext dbContext = _dbContextFactory.CreateDbContext();
+            Validation<BaseError, FillerPreset> validation = await FillerPresetMustExist(dbContext, request);
+            return await validation.Apply(ps => DoDeletion(dbContext, ps));
+        }
+
+        private static Task<Unit> DoDeletion(TvContext dbContext, FillerPreset fillerPreset)
+        {
+            dbContext.FillerPresets.Remove(fillerPreset);
+            return dbContext.SaveChangesAsync().ToUnit();
+        }
+
+        private Task<Validation<BaseError, FillerPreset>> FillerPresetMustExist(
+            TvContext dbContext,
+            DeleteFillerPreset request) =>
+            dbContext.FillerPresets
+                .SelectOneAsync(fp => fp.Id, ps => ps.Id == request.FillerPresetId)
+                .Map(o => o.ToValidation<BaseError>($"FillerPreset {request.FillerPresetId} does not exist."));
+    }
+}

ErsatzTV.Application/Filler/Commands/UpdateFillerPreset.cs

@@ -0,0 +1,25 @@
+using System;
+using ErsatzTV.Core;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
+using LanguageExt;
+using MediatR;
+using Unit = LanguageExt.Unit;
+
+namespace ErsatzTV.Application.Filler.Commands
+{
+    public record UpdateFillerPreset(
+        int Id,
+        string Name,
+        FillerKind FillerKind,
+        FillerMode FillerMode,
+        TimeSpan? Duration,
+        int? Count,
+        int? PadToNearestMinute,
+        ProgramScheduleItemCollectionType CollectionType,
+        int? CollectionId,
+        int? MediaItemId,
+        int? MultiCollectionId,
+        int? SmartCollectionId
+    ) : IRequest<Either<BaseError, Unit>>;
+}

ErsatzTV.Application/Filler/Commands/UpdateFillerPresetHandler.cs

@@ -0,0 +1,60 @@
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Core;
+using ErsatzTV.Core.Domain.Filler;
+using ErsatzTV.Infrastructure.Data;
+using ErsatzTV.Infrastructure.Extensions;
+using LanguageExt;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using Unit = LanguageExt.Unit;
+
+namespace ErsatzTV.Application.Filler.Commands
+{
+    public class UpdateFillerPresetHandler : IRequestHandler<UpdateFillerPreset, Either<BaseError, Unit>>
+    {
+        private readonly IDbContextFactory<TvContext> _dbContextFactory;
+
+        public UpdateFillerPresetHandler(IDbContextFactory<TvContext> dbContextFactory)
+        {
+            _dbContextFactory = dbContextFactory;
+        }
+
+        public async Task<Either<BaseError, Unit>> Handle(UpdateFillerPreset request, CancellationToken cancellationToken)
+        {
+            await using TvContext dbContext = _dbContextFactory.CreateDbContext();
+
+            Validation<BaseError, FillerPreset> validation = await FillerPresetMustExist(dbContext, request);
+            return await validation.Apply(ps => ApplyUpdateRequest(dbContext, ps, request));
+        }
+
+        private async Task<Unit> ApplyUpdateRequest(
+            TvContext dbContext,
+            FillerPreset existing,
+            UpdateFillerPreset request)
+        {
+            existing.Name = request.Name;
+            existing.FillerKind = request.FillerKind;
+            existing.FillerMode = request.FillerMode;
+            existing.Duration = request.Duration;
+            existing.Count = request.Count;
+            existing.PadToNearestMinute = request.PadToNearestMinute;
+            existing.CollectionType = request.CollectionType;
+            existing.CollectionId = request.CollectionId;
+            existing.MediaItemId = request.MediaItemId;
+            existing.MultiCollectionId = request.MultiCollectionId;
+            existing.SmartCollectionId = request.SmartCollectionId;
+
+            await dbContext.SaveChangesAsync();
+
+            return Unit.Default;
+        }
+
+        private static Task<Validation<BaseError, FillerPreset>> FillerPresetMustExist(
+            TvContext dbContext,
+            UpdateFillerPreset request) =>
+            dbContext.FillerPresets
+                .SelectOneAsync(ps => ps.Id, ps => ps.Id == request.Id)
+                .Map(o => o.ToValidation<BaseError>("FillerPreset does not exist"));
+    }
+}

ErsatzTV.Application/Filler/FillerPresetViewModel.cs

@@ -0,0 +1,20 @@
+using System;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
+
+namespace ErsatzTV.Application.Filler
+{
+    public record FillerPresetViewModel(
+        int Id,
+        string Name,
+        FillerKind FillerKind,
+        FillerMode FillerMode,
+        TimeSpan? Duration,
+        int? Count,
+        int? PadToNearestMinute,
+        ProgramScheduleItemCollectionType CollectionType,
+        int? CollectionId,
+        int? MediaItemId,
+        int? MultiCollectionId,
+        int? SmartCollectionId);
+}

ErsatzTV.Application/Filler/Mapper.cs

@@ -0,0 +1,22 @@
+using ErsatzTV.Core.Domain.Filler;
+
+namespace ErsatzTV.Application.Filler
+{
+    internal static class Mapper
+    {
+        internal static FillerPresetViewModel ProjectToViewModel(FillerPreset fillerPreset) =>
+            new(
+                fillerPreset.Id,
+                fillerPreset.Name,
+                fillerPreset.FillerKind,
+                fillerPreset.FillerMode,
+                fillerPreset.Duration,
+                fillerPreset.Count,
+                fillerPreset.PadToNearestMinute,
+                fillerPreset.CollectionType,
+                fillerPreset.CollectionId,
+                fillerPreset.MediaItemId,
+                fillerPreset.MultiCollectionId,
+                fillerPreset.SmartCollectionId);
+    }
+}

ErsatzTV.Application/Filler/PagedFillerPresetsViewModel.cs

@@ -0,0 +1,6 @@
+using System.Collections.Generic;
+
+namespace ErsatzTV.Application.Filler
+{
+    public record PagedFillerPresetsViewModel(int TotalCount, List<FillerPresetViewModel> Page);
+}

ErsatzTV.Application/Filler/Queries/GetAllFillerPresets.cs

@@ -0,0 +1,7 @@
+using System.Collections.Generic;
+using MediatR;
+
+namespace ErsatzTV.Application.Filler.Queries
+{
+    public record GetAllFillerPresets : IRequest<List<FillerPresetViewModel>>;
+}

ErsatzTV.Application/Filler/Queries/GetAllFillerPresetsHandler.cs

@@ -0,0 +1,29 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Infrastructure.Data;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using LanguageExt;
+using static ErsatzTV.Application.Filler.Mapper;
+
+namespace ErsatzTV.Application.Filler.Queries
+{
+    public class GetAllFillerPresetsHandler : IRequestHandler<GetAllFillerPresets, List<FillerPresetViewModel>>
+    {
+        private readonly IDbContextFactory<TvContext> _dbContextFactory;
+
+        public GetAllFillerPresetsHandler(IDbContextFactory<TvContext> dbContextFactory) =>
+            _dbContextFactory = dbContextFactory;
+
+        public async Task<List<FillerPresetViewModel>> Handle(
+            GetAllFillerPresets request,
+            CancellationToken cancellationToken)
+        {
+            await using TvContext dbContext = _dbContextFactory.CreateDbContext();
+            return await dbContext.FillerPresets.ToListAsync(cancellationToken)
+                .Map(presets => presets.Map(ProjectToViewModel).ToList());
+        }
+    }
+}

ErsatzTV.Application/Filler/Queries/GetFillerPresetById.cs

@@ -0,0 +1,7 @@
+using LanguageExt;
+using MediatR;
+
+namespace ErsatzTV.Application.Filler.Queries
+{
+    public record GetFillerPresetById(int Id) : IRequest<Option<FillerPresetViewModel>>;
+}

ErsatzTV.Application/Filler/Queries/GetFillerPresetByIdHandler.cs

@@ -0,0 +1,29 @@
+using System.Threading;
+using System.Threading.Tasks;
+using ErsatzTV.Infrastructure.Data;
+using ErsatzTV.Infrastructure.Extensions;
+using LanguageExt;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using static ErsatzTV.Application.Filler.Mapper;
+
+namespace ErsatzTV.Application.Filler.Queries
+{
+    public class GetFillerPresetByIdHandler : IRequestHandler<GetFillerPresetById, Option<FillerPresetViewModel>>
+    {
+        private readonly IDbContextFactory<TvContext> _dbContextFactory;
+
+        public GetFillerPresetByIdHandler(IDbContextFactory<TvContext> dbContextFactory) =>
+            _dbContextFactory = dbContextFactory;
+
+        public async Task<Option<FillerPresetViewModel>> Handle(
+            GetFillerPresetById request,
+            CancellationToken cancellationToken)
+        {
+            await using TvContext dbContext = _dbContextFactory.CreateDbContext();
+            return await dbContext.FillerPresets
+                .SelectOneAsync(c => c.Id, c => c.Id == request.Id)
+                .MapT(ProjectToViewModel);
+        }
+    }
+}

ErsatzTV.Application/Filler/Queries/GetPagedFillerPresets.cs

@@ -0,0 +1,6 @@
+using MediatR;
+
+namespace ErsatzTV.Application.Filler.Queries
+{
+    public record GetPagedFillerPresets(int PageNum, int PageSize) : IRequest<PagedFillerPresetsViewModel>;
+}

ErsatzTV.Application/Filler/Queries/GetPagedFillerPresetsHandler.cs

@@ -0,0 +1,46 @@
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Dapper;
+using ErsatzTV.Infrastructure.Data;
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using LanguageExt;
+using static ErsatzTV.Application.Filler.Mapper;
+
+namespace ErsatzTV.Application.Filler.Queries
+{
+    public class GetPagedFillerPresetsHandler : IRequestHandler<GetPagedFillerPresets, PagedFillerPresetsViewModel>
+    {
+        private readonly IDbConnection _dbConnection;
+        private readonly IDbContextFactory<TvContext> _dbContextFactory;
+
+        public GetPagedFillerPresetsHandler(IDbContextFactory<TvContext> dbContextFactory, IDbConnection dbConnection)
+        {
+            _dbContextFactory = dbContextFactory;
+            _dbConnection = dbConnection;
+        }
+
+        public async Task<PagedFillerPresetsViewModel> Handle(
+            GetPagedFillerPresets request,
+            CancellationToken cancellationToken)
+        {
+            int count = await _dbConnection.QuerySingleAsync<int>(@"SELECT COUNT (*) FROM FillerPreset");
+
+            await using TvContext dbContext = _dbContextFactory.CreateDbContext();
+            List<FillerPresetViewModel> page = await dbContext.FillerPresets.FromSqlRaw(
+                    @"SELECT * FROM FillerPreset
+                    ORDER BY Name
+                    COLLATE NOCASE
+                    LIMIT {0} OFFSET {1}",
+                    request.PageSize,
+                    request.PageNum * request.PageSize)
+                .ToListAsync(cancellationToken)
+                .Map(list => list.Map(ProjectToViewModel).ToList());
+
+            return new PagedFillerPresetsViewModel(count, page);
+        }
+    }
+}

ErsatzTV.Application/HDHR/Commands/UpdateHDHRTunerCountHandler.cs

@@ -24,7 +24,7 @@ namespace ErsatzTV.Application.HDHR.Commands
 
         private static Task<Validation<BaseError, Unit>> Validate(UpdateHDHRTunerCount request) =>
             Optional(request.TunerCount)
-                .Filter(tc => tc > 0)
+                .Where(tc => tc > 0)
                 .Map(_ => Unit.Default)
                 .ToValidation<BaseError>("Tuner count must be greater than zero")
                 .AsTask();

ErsatzTV.Application/Jellyfin/Commands/SynchronizeJellyfinAdminUserIdHandler.cs

@@ -97,7 +97,7 @@ namespace ErsatzTV.Application.Jellyfin.Commands
         {
             JellyfinSecrets secrets = await _jellyfinSecretStore.ReadSecrets();
             return Optional(secrets.Address == connectionParameters.ActiveConnection.Address)
-                .Filter(match => match)
+                .Where(match => match)
                 .Map(_ => connectionParameters with { ApiKey = secrets.ApiKey })
                 .ToValidation<BaseError>("Jellyfin media source requires an api key");
         }

ErsatzTV.Application/Jellyfin/Commands/SynchronizeJellyfinLibrariesHandler.cs

@@ -69,7 +69,7 @@ namespace ErsatzTV.Application.Jellyfin.Commands
         {
             JellyfinSecrets secrets = await _jellyfinSecretStore.ReadSecrets();
             return Optional(secrets.Address == connectionParameters.ActiveConnection.Address)
-                .Filter(match => match)
+                .Where(match => match)
                 .Map(_ => connectionParameters with { ApiKey = secrets.ApiKey })
                 .ToValidation<BaseError>("Jellyfin media source requires an api key");
         }

ErsatzTV.Application/Jellyfin/Commands/SynchronizeJellyfinLibraryByIdHandler.cs

@@ -142,7 +142,7 @@ namespace ErsatzTV.Application.Jellyfin.Commands
         {
             JellyfinSecrets secrets = await _jellyfinSecretStore.ReadSecrets();
             return Optional(secrets.Address == connectionParameters.ActiveConnection.Address)
-                .Filter(match => match)
+                .Where(match => match)
                 .Map(_ => connectionParameters with { ApiKey = secrets.ApiKey })
                 .ToValidation<BaseError>("Jellyfin media source requires an api key");
         }

ErsatzTV.Application/Libraries/Commands/CreateLocalLibraryPathHandler.cs

@@ -46,7 +46,7 @@ namespace ErsatzTV.Application.Libraries.Commands
                 .Map(list => list.Map(c => c.Path).ToList());
 
             return Optional(request.Path)
-                .Filter(folder => allPaths.ForAll(f => !AreSubPaths(f, folder)))
+                .Where(folder => allPaths.ForAll(f => !AreSubPaths(f, folder)))
                 .ToValidation<BaseError>("Path must not belong to another library path");
         }
 

ErsatzTV.Application/Libraries/Commands/LocalLibraryHandlerBase.cs

@@ -33,7 +33,7 @@ namespace ErsatzTV.Application.Libraries.Commands
                 .Map(list => list.SelectMany(ll => ll.Paths).Map(lp => lp.Path).ToList());
 
             return Optional(localLibrary.Paths.Count(folder => allPaths.Any(f => AreSubPaths(f, folder.Path))))
-                .Filter(length => length == 0)
+                .Where(length => length == 0)
                 .Map(_ => localLibrary)
                 .ToValidation<BaseError>("Path must not belong to another library path");
         }

ErsatzTV.Application/MediaCollections/Commands/CreateCollectionHandler.cs

@@ -60,7 +60,7 @@ namespace ErsatzTV.Application.MediaCollections.Commands
                 .Bind(_ => createCollection.NotLongerThan(50)(c => c.Name));
 
             var result2 = Optional(createCollection.Name)
-                .Filter(name => !allNames.Contains(name))
+                .Where(name => !allNames.Contains(name))
                 .ToValidation<BaseError>("Collection name must be unique");
 
             return (result1, result2).Apply((_, _) => createCollection.Name);

ErsatzTV.Application/MediaCollections/Commands/CreateMultiCollectionHandler.cs

@@ -104,7 +104,7 @@ namespace ErsatzTV.Application.MediaCollections.Commands
                 .Bind(_ => createMultiCollection.NotLongerThan(50)(c => c.Name));
 
             var result2 = Optional(createMultiCollection.Name)
-                .Filter(name => !allNames.Contains(name))
+                .Where(name => !allNames.Contains(name))
                 .ToValidation<BaseError>("MultiCollection name must be unique");
 
             return (result1, result2).Apply((_, _) => createMultiCollection.Name);

ErsatzTV.Application/MediaCollections/Commands/CreateSmartCollectionHandler.cs

@@ -61,7 +61,7 @@ namespace ErsatzTV.Application.MediaCollections.Commands
                 .Bind(_ => createSmartCollection.NotLongerThan(50)(c => c.Name));
 
             var result2 = Optional(createSmartCollection.Name)
-                .Filter(name => !allNames.Contains(name))
+                .Where(name => !allNames.Contains(name))
                 .ToValidation<BaseError>("SmartCollection name must be unique");
 
             return (result1, result2).Apply((_, _) => createSmartCollection.Name);

ErsatzTV.Application/MediaCollections/Commands/UpdateMultiCollectionHandler.cs

@@ -156,7 +156,7 @@ namespace ErsatzTV.Application.MediaCollections.Commands
                 .Bind(_ => updateMultiCollection.NotLongerThan(50)(c => c.Name));
 
             var result2 = Optional(updateMultiCollection.Name)
-                .Filter(name => !allNames.Contains(name))
+                .Where(name => !allNames.Contains(name))
                 .ToValidation<BaseError>("MultiCollection name must be unique");
 
             return (result1, result2).Apply((_, _) => updateMultiCollection.Name);

ErsatzTV.Application/Playouts/Commands/BuildPlayoutHandler.cs

@@ -52,6 +52,21 @@ namespace ErsatzTV.Application.Playouts.Commands
                 .Include(p => p.ProgramSchedule)
                 .ThenInclude(ps => ps.Items)
                 .ThenInclude(psi => psi.MediaItem)
+                .Include(p => p.ProgramSchedule)
+                .ThenInclude(ps => ps.Items)
+                .ThenInclude(psi => psi.PreRollFiller)
+                .Include(p => p.ProgramSchedule)
+                .ThenInclude(ps => ps.Items)
+                .ThenInclude(psi => psi.MidRollFiller)
+                .Include(p => p.ProgramSchedule)
+                .ThenInclude(ps => ps.Items)
+                .ThenInclude(psi => psi.PostRollFiller)
+                .Include(p => p.ProgramSchedule)
+                .ThenInclude(ps => ps.Items)
+                .ThenInclude(psi => psi.TailFiller)
+                .Include(p => p.ProgramSchedule)
+                .ThenInclude(ps => ps.Items)
+                .ThenInclude(psi => psi.FallbackFiller)
                 .SelectOneAsync(p => p.Id, p => p.Id == buildPlayout.PlayoutId)
                 .Map(o => o.ToValidation<BaseError>("Playout does not exist."));
     }

ErsatzTV.Application/Playouts/Mapper.cs

@@ -8,13 +8,13 @@ namespace ErsatzTV.Application.Playouts
     {
         internal static PlayoutItemViewModel ProjectToViewModel(PlayoutItem playoutItem) =>
             new(
-                GetDisplayTitle(playoutItem.MediaItem),
+                GetDisplayTitle(playoutItem),
                 playoutItem.StartOffset,
-                GetDisplayDuration(playoutItem.MediaItem));
+                GetDisplayDuration(playoutItem.FinishOffset - playoutItem.StartOffset));
 
-        private static string GetDisplayTitle(MediaItem mediaItem)
+        private static string GetDisplayTitle(PlayoutItem playoutItem)
         {
-            switch (mediaItem)
+            switch (playoutItem.MediaItem)
             {
                 case Episode e:
                     string showTitle = e.Season.Show.ShowMetadata.HeadOrNone()
@@ -28,6 +28,11 @@ namespace ErsatzTV.Application.Playouts
 
                     var numbersString = $"e{string.Join('e', episodeNumbers.Map(n => $"{n:00}"))}";
                     var titlesString = $"{string.Join('/', episodeTitles)}";
+                    if (!string.IsNullOrWhiteSpace(playoutItem.ChapterTitle))
+                    {
+                        titlesString += $" ({playoutItem.ChapterTitle})";
+                    }
+
                     return $"{showTitle}s{e.Season.SeasonNumber:00}{numbersString} - {titlesString}";
                 case Movie m:
                     return m.MovieMetadata.HeadOrNone().Map(mm => mm.Title).IfNone("[unknown movie]");
@@ -36,29 +41,21 @@ namespace ErsatzTV.Application.Playouts
                         .Map(am => $"{am.Title} - ").IfNone(string.Empty);
                     return mv.MusicVideoMetadata.HeadOrNone()
                         .Map(mvm => $"{artistName}{mvm.Title}")
+                        .Map(s => string.IsNullOrWhiteSpace(playoutItem.ChapterTitle) ? s : $"{s} ({playoutItem.ChapterTitle})")
                         .IfNone("[unknown music video]");
                 case OtherVideo ov:
-                    return ov.OtherVideoMetadata.HeadOrNone().Map(ovm => ovm.Title ?? string.Empty)
+                    return ov.OtherVideoMetadata.HeadOrNone()
+                        .Map(ovm => ovm.Title ?? string.Empty)
+                        .Map(s => string.IsNullOrWhiteSpace(playoutItem.ChapterTitle) ? s : $"{s} ({playoutItem.ChapterTitle})")
                         .IfNone("[unknown video]");
                 default:
                     return string.Empty;
             }
         }
 
-        private static string GetDisplayDuration(MediaItem mediaItem)
-        {
-            MediaVersion version = mediaItem switch
-            {
-                Movie m => m.MediaVersions.Head(),
-                Episode e => e.MediaVersions.Head(),
-                MusicVideo mv => mv.MediaVersions.Head(),
-                OtherVideo ov => ov.MediaVersions.Head(),
-                _ => throw new ArgumentOutOfRangeException(nameof(mediaItem))
-            };
-
-            return string.Format(
-                version.Duration.TotalHours >= 1 ? @"{0:h\:mm\:ss}" : @"{0:mm\:ss}",
-                version.Duration);
-        }
+        private static string GetDisplayDuration(TimeSpan duration) =>
+            string.Format(
+                duration.TotalHours >= 1 ? @"{0:h\:mm\:ss}" : @"{0:mm\:ss}",
+                duration);
     }
 }

ErsatzTV.Application/Playouts/Queries/GetFuturePlayoutItemsById.cs

@@ -1,7 +1,6 @@
-using System.Collections.Generic;
-using MediatR;
+using MediatR;
 
 namespace ErsatzTV.Application.Playouts.Queries
 {
-    public record GetFuturePlayoutItemsById(int PlayoutId, int PageNum, int PageSize) : IRequest<PagedPlayoutItemsViewModel>;
+    public record GetFuturePlayoutItemsById(int PlayoutId, bool ShowFiller, int PageNum, int PageSize) : IRequest<PagedPlayoutItemsViewModel>;
 }

ErsatzTV.Application/Playouts/Queries/GetFuturePlayoutItemsByIdHandler.cs

@@ -4,6 +4,7 @@ using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
 using ErsatzTV.Infrastructure.Data;
 using LanguageExt;
 using MediatR;
@@ -25,10 +26,10 @@ namespace ErsatzTV.Application.Playouts.Queries
         {
             await using TvContext dbContext = _dbContextFactory.CreateDbContext();
 
-            int totalCount = await dbContext.PlayoutItems
-                .CountAsync(i => i.PlayoutId == request.PlayoutId, cancellationToken);
-
             DateTime now = DateTimeOffset.Now.UtcDateTime;
+
+            int totalCount = await dbContext.PlayoutItems
+                .CountAsync(i => i.Finish >= now && i.PlayoutId == request.PlayoutId && (request.ShowFiller || i.FillerKind == FillerKind.None), cancellationToken);
             
             List<PlayoutItemViewModel> page = await dbContext.PlayoutItems
                 .Include(i => i.MediaItem)
@@ -58,6 +59,7 @@ namespace ErsatzTV.Application.Playouts.Queries
                 .ThenInclude(mi => (mi as OtherVideo).MediaVersions)
                 .Filter(i => i.PlayoutId == request.PlayoutId)
                 .Filter(i => i.Finish >= now)
+                .Filter(i => request.ShowFiller || i.FillerKind == FillerKind.None)
                 .OrderBy(i => i.Start)
                 .Skip(request.PageNum * request.PageSize)
                 .Take(request.PageSize)

ErsatzTV.Application/ProgramSchedules/Commands/AddProgramScheduleItem.cs

@@ -20,11 +20,11 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
         int? MultipleCount,
         TimeSpan? PlayoutDuration,
         TailMode TailMode,
-        ProgramScheduleItemCollectionType TailCollectionType,
-        int? TailCollectionId,
-        int? TailMultiCollectionId,
-        int? TailSmartCollectionId,
-        int? TailMediaItemId,
         string CustomTitle,
-        GuideMode GuideMode) : IRequest<Either<BaseError, ProgramScheduleItemViewModel>>, IProgramScheduleItemRequest;
+        GuideMode GuideMode,
+        int? PreRollFillerId,
+        int? MidRollFillerId,
+        int? PostRollFillerId,
+        int? TailFillerId,
+        int? FallbackFillerId) : IRequest<Either<BaseError, ProgramScheduleItemViewModel>>, IProgramScheduleItemRequest;
 }

ErsatzTV.Application/ProgramSchedules/Commands/CreateProgramScheduleHandler.cs

@@ -65,7 +65,7 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
                 .CountAsync(ps => ps.Name == createProgramSchedule.Name);
 
             var result2 = Optional(duplicateNameCount)
-                .Filter(count => count == 0)
+                .Where(count => count == 0)
                 .ToValidation<BaseError>("Schedule name must be unique");
 
             return (result1, result2).Apply((_, _) => createProgramSchedule.Name);

ErsatzTV.Application/ProgramSchedules/Commands/IProgramScheduleItemRequest.cs

@@ -16,12 +16,12 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
         int? MultipleCount { get; }
         TimeSpan? PlayoutDuration { get; }
         TailMode TailMode { get; }
-        ProgramScheduleItemCollectionType TailCollectionType { get; }
-        int? TailCollectionId { get; }
-        int? TailMultiCollectionId { get; }
-        int? TailSmartCollectionId { get; }
-        int? TailMediaItemId { get; }
         string CustomTitle { get; }
         GuideMode GuideMode { get; }
+        int? PreRollFillerId { get; }
+        int? MidRollFillerId { get; }
+        int? PostRollFillerId { get; }
+        int? TailFillerId { get; }
+        int? FallbackFillerId { get; }
     }
 }

ErsatzTV.Application/ProgramSchedules/Commands/ProgramScheduleItemCommandBase.cs

@@ -1,11 +1,15 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
 using System.Threading.Tasks;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
 using ErsatzTV.Infrastructure.Data;
 using ErsatzTV.Infrastructure.Extensions;
 using LanguageExt;
 using Microsoft.EntityFrameworkCore;
+using static LanguageExt.Prelude;
 
 namespace ErsatzTV.Application.ProgramSchedules.Commands
 {
@@ -20,6 +24,33 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
                 .SelectOneAsync(ps => ps.Id, ps => ps.Id == programScheduleId)
                 .Map(o => o.ToValidation<BaseError>("[ProgramScheduleId] does not exist."));
 
+        protected static async Task<Either<BaseError, ProgramSchedule>> FillerConfigurationMustBeValid(
+            TvContext dbContext,
+            IProgramScheduleItemRequest item,
+            ProgramSchedule programSchedule)
+        {
+            var allFillerIds = Optional(item.PreRollFillerId)
+                .Append(Optional(item.MidRollFillerId))
+                .Append(Optional(item.PostRollFillerId))
+                .ToList();
+
+            List<FillerPreset> allFiller = await dbContext.FillerPresets
+                .Filter(fp => allFillerIds.Contains(fp.Id))
+                .ToListAsync();
+            
+            if (allFiller.Count(f => f.PadToNearestMinute.HasValue) > 1)
+            {
+                return BaseError.New("Schedule may only contain one filler preset that is configured to pad");
+            }
+
+            if (allFiller.Any(fp => fp.PadToNearestMinute.HasValue) && !item.FallbackFillerId.HasValue)
+            {
+                return BaseError.New("Fallback filler is required when padding");
+            }
+
+            return programSchedule;
+        }
+
         protected static Validation<BaseError, ProgramSchedule> PlayoutModeMustBeValid(
             IProgramScheduleItemRequest item,
             ProgramSchedule programSchedule)
@@ -55,6 +86,16 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
                         return BaseError.New("[PlayoutDuration] is required for playout mode 'duration'");
                     }
 
+                    if (item.TailMode == TailMode.Filler && item.TailFillerId == null)
+                    {
+                        return BaseError.New("Tail Filler is required with tail mode Filler");
+                    }
+
+                    if (item.TailFillerId != null && item.TailMode != TailMode.Filler)
+                    {
+                        return BaseError.New("Tail Filler will not be used unless tail mode is set to Filler");
+                    }
+
                     break;
                 default:
                     return BaseError.New("[PlayoutMode] is invalid");
@@ -128,7 +169,7 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
                 {
                     ProgramScheduleId = programSchedule.Id,
                     Index = index,
-                    StartTime = item.StartTime,
+                    StartTime = FixStartTime(item.StartTime),
                     CollectionType = item.CollectionType,
                     CollectionId = item.CollectionId,
                     MultiCollectionId = item.MultiCollectionId,
@@ -136,13 +177,18 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
                     MediaItemId = item.MediaItemId,
                     PlaybackOrder = item.PlaybackOrder,
                     CustomTitle = item.CustomTitle,
-                    GuideMode = item.GuideMode
+                    GuideMode = item.GuideMode,
+                    PreRollFillerId = item.PreRollFillerId,
+                    MidRollFillerId = item.MidRollFillerId,
+                    PostRollFillerId = item.PostRollFillerId,
+                    TailFillerId = item.TailFillerId,
+                    FallbackFillerId = item.FallbackFillerId
                 },
                 PlayoutMode.One => new ProgramScheduleItemOne
                 {
                     ProgramScheduleId = programSchedule.Id,
                     Index = index,
-                    StartTime = item.StartTime,
+                    StartTime = FixStartTime(item.StartTime),
                     CollectionType = item.CollectionType,
                     CollectionId = item.CollectionId,
                     MultiCollectionId = item.MultiCollectionId,
@@ -150,13 +196,18 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
                     MediaItemId = item.MediaItemId,
                     PlaybackOrder = item.PlaybackOrder,
                     CustomTitle = item.CustomTitle,
-                    GuideMode = item.GuideMode
+                    GuideMode = item.GuideMode,
+                    PreRollFillerId = item.PreRollFillerId,
+                    MidRollFillerId = item.MidRollFillerId,
+                    PostRollFillerId = item.PostRollFillerId,
+                    TailFillerId = item.TailFillerId,
+                    FallbackFillerId = item.FallbackFillerId
                 },
                 PlayoutMode.Multiple => new ProgramScheduleItemMultiple
                 {
                     ProgramScheduleId = programSchedule.Id,
                     Index = index,
-                    StartTime = item.StartTime,
+                    StartTime = FixStartTime(item.StartTime),
                     CollectionType = item.CollectionType,
                     CollectionId = item.CollectionId,
                     MultiCollectionId = item.MultiCollectionId,
@@ -165,13 +216,18 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
                     PlaybackOrder = item.PlaybackOrder,
                     Count = item.MultipleCount.GetValueOrDefault(),
                     CustomTitle = item.CustomTitle,
-                    GuideMode = item.GuideMode
+                    GuideMode = item.GuideMode,
+                    PreRollFillerId = item.PreRollFillerId,
+                    MidRollFillerId = item.MidRollFillerId,
+                    PostRollFillerId = item.PostRollFillerId,
+                    TailFillerId = item.TailFillerId,
+                    FallbackFillerId = item.FallbackFillerId
                 },
                 PlayoutMode.Duration => new ProgramScheduleItemDuration
                 {
                     ProgramScheduleId = programSchedule.Id,
                     Index = index,
-                    StartTime = item.StartTime,
+                    StartTime = FixStartTime(item.StartTime),
                     CollectionType = item.CollectionType,
                     CollectionId = item.CollectionId,
                     MultiCollectionId = item.MultiCollectionId,
@@ -180,18 +236,23 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
                     PlaybackOrder = item.PlaybackOrder,
                     PlayoutDuration = FixDuration(item.PlayoutDuration.GetValueOrDefault()),
                     TailMode = item.TailMode,
-                    TailCollectionType = item.TailCollectionType,
-                    TailCollectionId = item.TailCollectionId,
-                    TailMultiCollectionId = item.TailMultiCollectionId,
-                    TailSmartCollectionId = item.TailSmartCollectionId,
-                    TailMediaItemId = item.TailMediaItemId,
                     CustomTitle = item.CustomTitle,
-                    GuideMode = item.GuideMode
+                    GuideMode = item.GuideMode,
+                    PreRollFillerId = item.PreRollFillerId,
+                    MidRollFillerId = item.MidRollFillerId,
+                    PostRollFillerId = item.PostRollFillerId,
+                    TailFillerId = item.TailFillerId,
+                    FallbackFillerId = item.FallbackFillerId
                 },
                 _ => throw new NotSupportedException($"Unsupported playout mode {item.PlayoutMode}")
             };
 
         private static TimeSpan FixDuration(TimeSpan duration) =>
-            duration > TimeSpan.FromDays(1) ? duration.Subtract(TimeSpan.FromDays(1)) : duration;
+            duration >= TimeSpan.FromDays(1) ? duration.Subtract(TimeSpan.FromDays(1)) : duration;
+
+        private static TimeSpan? FixStartTime(TimeSpan? startTime) =>
+            startTime.HasValue && startTime.Value >= TimeSpan.FromDays(1)
+                ? startTime.Value.Subtract(TimeSpan.FromDays(1))
+                : startTime;
     }
 }

ErsatzTV.Application/ProgramSchedules/Commands/ReplaceProgramScheduleItems.cs

@@ -21,13 +21,13 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
         int? MultipleCount,
         TimeSpan? PlayoutDuration,
         TailMode TailMode,
-        ProgramScheduleItemCollectionType TailCollectionType,
-        int? TailCollectionId,
-        int? TailMultiCollectionId,
-        int? TailSmartCollectionId,
-        int? TailMediaItemId,
         string CustomTitle,
-        GuideMode GuideMode) : IProgramScheduleItemRequest;
+        GuideMode GuideMode,
+        int? PreRollFillerId,
+        int? MidRollFillerId,
+        int? PostRollFillerId,
+        int? TailFillerId,
+        int? FallbackFillerId) : IProgramScheduleItemRequest;
 
     public record ReplaceProgramScheduleItems
         (int ProgramScheduleId, List<ReplaceProgramScheduleItem> Items) : IRequest<

ErsatzTV.Application/ProgramSchedules/Commands/ReplaceProgramScheduleItemsHandler.cs

@@ -63,7 +63,8 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
             ProgramScheduleMustExist(dbContext, request.ProgramScheduleId)
                 .BindT(programSchedule => PlayoutModesMustBeValid(request, programSchedule))
                 .BindT(programSchedule => CollectionTypesMustBeValid(request, programSchedule))
-                .BindT(programSchedule => PlaybackOrdersMustBeValid(request, programSchedule));
+                .BindT(programSchedule => PlaybackOrdersMustBeValid(request, programSchedule))
+                .BindT(programSchedule => FillerConfigurationsMustBeValid(dbContext, request, programSchedule));
 
         private static Validation<BaseError, ProgramSchedule> PlayoutModesMustBeValid(
             ReplaceProgramScheduleItems request,
@@ -77,6 +78,26 @@ namespace ErsatzTV.Application.ProgramSchedules.Commands
             request.Items.Map(item => CollectionTypeMustBeValid(item, programSchedule)).Sequence()
                 .Map(_ => programSchedule);
 
+        private static async Task<Validation<BaseError, ProgramSchedule>> FillerConfigurationsMustBeValid(
+            TvContext dbContext,
+            ReplaceProgramScheduleItems request,
+            ProgramSchedule programSchedule)
+        {
+            foreach (ReplaceProgramScheduleItem item in request.Items)
+            {
+                Either<BaseError, ProgramSchedule> result = await FillerConfigurationMustBeValid(
+                    dbContext,
+                    item,
+                    programSchedule);
+                if (result.IsLeft)
+                {
+                    return result.ToValidation();
+                }
+            }
+
+            return programSchedule;
+        }
+
         private static Validation<BaseError, ProgramSchedule> PlaybackOrdersMustBeValid(
             ReplaceProgramScheduleItems request,
             ProgramSchedule programSchedule)

ErsatzTV.Application/ProgramSchedules/Mapper.cs

@@ -41,25 +41,23 @@ namespace ErsatzTV.Application.ProgramSchedules
                         duration.PlaybackOrder,
                         duration.PlayoutDuration,
                         duration.TailMode,
-                        duration.TailCollectionType,
-                        duration.TailCollection != null
-                            ? MediaCollections.Mapper.ProjectToViewModel(duration.TailCollection)
-                            : null,
-                        duration.TailMultiCollection != null
-                            ? MediaCollections.Mapper.ProjectToViewModel(duration.TailMultiCollection)
-                            : null,
-                        duration.TailSmartCollection != null
-                            ? MediaCollections.Mapper.ProjectToViewModel(duration.TailSmartCollection)
-                            : null,
-                        duration.TailMediaItem switch
-                        {
-                            Show show => MediaItems.Mapper.ProjectToViewModel(show),
-                            Season season => MediaItems.Mapper.ProjectToViewModel(season),
-                            Artist artist => MediaItems.Mapper.ProjectToViewModel(artist),
-                            _ => null
-                        },
                         duration.CustomTitle,
-                        duration.GuideMode),
+                        duration.GuideMode,
+                        duration.PreRollFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(duration.PreRollFiller)
+                            : null,
+                        duration.MidRollFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(duration.MidRollFiller)
+                            : null,
+                        duration.PostRollFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(duration.PostRollFiller)
+                            : null,
+                        duration.TailFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(duration.TailFiller)
+                            : null,
+                        duration.FallbackFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(duration.FallbackFiller)
+                            : null),
                 ProgramScheduleItemFlood flood =>
                     new ProgramScheduleItemFloodViewModel(
                         flood.Id,
@@ -85,7 +83,22 @@ namespace ErsatzTV.Application.ProgramSchedules
                         },
                         flood.PlaybackOrder,
                         flood.CustomTitle,
-                        flood.GuideMode),
+                        flood.GuideMode,
+                        flood.PreRollFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(flood.PreRollFiller)
+                            : null,
+                        flood.MidRollFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(flood.MidRollFiller)
+                            : null,
+                        flood.PostRollFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(flood.PostRollFiller)
+                            : null,
+                        flood.TailFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(flood.TailFiller)
+                            : null,
+                        flood.FallbackFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(flood.FallbackFiller)
+                            : null),
                 ProgramScheduleItemMultiple multiple =>
                     new ProgramScheduleItemMultipleViewModel(
                         multiple.Id,
@@ -112,7 +125,22 @@ namespace ErsatzTV.Application.ProgramSchedules
                         multiple.PlaybackOrder,
                         multiple.Count,
                         multiple.CustomTitle,
-                        multiple.GuideMode),
+                        multiple.GuideMode,
+                        multiple.PreRollFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(multiple.PreRollFiller)
+                            : null,
+                        multiple.MidRollFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(multiple.MidRollFiller)
+                            : null,
+                        multiple.PostRollFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(multiple.PostRollFiller)
+                            : null,
+                        multiple.TailFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(multiple.TailFiller)
+                            : null,
+                        multiple.FallbackFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(multiple.FallbackFiller)
+                            : null),
                 ProgramScheduleItemOne one =>
                     new ProgramScheduleItemOneViewModel(
                         one.Id,
@@ -138,7 +166,22 @@ namespace ErsatzTV.Application.ProgramSchedules
                         },
                         one.PlaybackOrder,
                         one.CustomTitle,
-                        one.GuideMode),
+                        one.GuideMode,
+                        one.PreRollFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(one.PreRollFiller)
+                            : null,
+                        one.MidRollFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(one.MidRollFiller)
+                            : null,
+                        one.PostRollFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(one.PostRollFiller)
+                            : null,
+                        one.TailFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(one.TailFiller)
+                            : null,
+                        one.FallbackFiller != null
+                            ? Filler.Mapper.ProjectToViewModel(one.FallbackFiller)
+                            : null),
                 _ => throw new NotSupportedException(
                     $"Unsupported program schedule item type {programScheduleItem.GetType().Name}")
             };

ErsatzTV.Application/ProgramSchedules/ProgramScheduleItemDurationViewModel.cs

@@ -1,4 +1,5 @@
 using System;
+using ErsatzTV.Application.Filler;
 using ErsatzTV.Application.MediaCollections;
 using ErsatzTV.Application.MediaItems;
 using ErsatzTV.Core.Domain;
@@ -20,13 +21,13 @@ namespace ErsatzTV.Application.ProgramSchedules
             PlaybackOrder playbackOrder,
             TimeSpan playoutDuration,
             TailMode tailMode,
-            ProgramScheduleItemCollectionType tailCollectionType,
-            MediaCollectionViewModel tailCollection,
-            MultiCollectionViewModel tailMultiCollection,
-            SmartCollectionViewModel tailSmartCollection,
-            NamedMediaItemViewModel tailMediaItem,
             string customTitle,
-            GuideMode guideMode) : base(
+            GuideMode guideMode,
+            FillerPresetViewModel preRollFiller,
+            FillerPresetViewModel midRollFiller,
+            FillerPresetViewModel postRollFiller,
+            FillerPresetViewModel tailFiller,
+            FillerPresetViewModel fallbackFiller) : base(
             id,
             index,
             startType,
@@ -39,25 +40,18 @@ namespace ErsatzTV.Application.ProgramSchedules
             mediaItem,
             playbackOrder,
             customTitle,
-            guideMode)
+            guideMode,
+            preRollFiller,
+            midRollFiller,
+            postRollFiller,
+            tailFiller,
+            fallbackFiller)
         {
             PlayoutDuration = playoutDuration;
             TailMode = tailMode;
-            TailCollectionType = tailCollectionType;
-            TailCollection = tailCollection;
-            TailMultiCollection = tailMultiCollection;
-            TailSmartCollection = tailSmartCollection;
-            TailMediaItem = tailMediaItem;
         }
 
         public TimeSpan PlayoutDuration { get; }
         public TailMode TailMode { get; }
-        public ProgramScheduleItemCollectionType TailCollectionType { get; }
-
-        public MediaCollectionViewModel TailCollection { get; }
-        public MultiCollectionViewModel TailMultiCollection { get; }
-        public SmartCollectionViewModel TailSmartCollection { get; }
-        public NamedMediaItemViewModel TailMediaItem { get; }
-
     }
 }

ErsatzTV.Application/ProgramSchedules/ProgramScheduleItemFloodViewModel.cs

@@ -1,4 +1,5 @@
 using System;
+using ErsatzTV.Application.Filler;
 using ErsatzTV.Application.MediaCollections;
 using ErsatzTV.Application.MediaItems;
 using ErsatzTV.Core.Domain;
@@ -19,7 +20,12 @@ namespace ErsatzTV.Application.ProgramSchedules
             NamedMediaItemViewModel mediaItem,
             PlaybackOrder playbackOrder,
             string customTitle,
-            GuideMode guideMode) : base(
+            GuideMode guideMode,
+            FillerPresetViewModel preRollFiller,
+            FillerPresetViewModel midRollFiller,
+            FillerPresetViewModel postRollFiller,
+            FillerPresetViewModel tailFiller,
+            FillerPresetViewModel fallbackFiller) : base(
             id,
             index,
             startType,
@@ -32,7 +38,12 @@ namespace ErsatzTV.Application.ProgramSchedules
             mediaItem,
             playbackOrder,
             customTitle,
-            guideMode)
+            guideMode,
+            preRollFiller,
+            midRollFiller,
+            postRollFiller,
+            tailFiller,
+            fallbackFiller)
         {
         }
     }

ErsatzTV.Application/ProgramSchedules/ProgramScheduleItemMultipleViewModel.cs

@@ -1,4 +1,5 @@
 using System;
+using ErsatzTV.Application.Filler;
 using ErsatzTV.Application.MediaCollections;
 using ErsatzTV.Application.MediaItems;
 using ErsatzTV.Core.Domain;
@@ -20,7 +21,12 @@ namespace ErsatzTV.Application.ProgramSchedules
             PlaybackOrder playbackOrder,
             int count,
             string customTitle,
-            GuideMode guideMode) : base(
+            GuideMode guideMode,
+            FillerPresetViewModel preRollFiller,
+            FillerPresetViewModel midRollFiller,
+            FillerPresetViewModel postRollFiller,
+            FillerPresetViewModel tailFiller,
+            FillerPresetViewModel fallbackFiller) : base(
             id,
             index,
             startType,
@@ -33,7 +39,12 @@ namespace ErsatzTV.Application.ProgramSchedules
             mediaItem,
             playbackOrder,
             customTitle,
-            guideMode) =>
+            guideMode,
+            preRollFiller,
+            midRollFiller,
+            postRollFiller,
+            tailFiller,
+            fallbackFiller) =>
             Count = count;
 
         public int Count { get; }

ErsatzTV.Application/ProgramSchedules/ProgramScheduleItemOneViewModel.cs

@@ -1,4 +1,5 @@
 using System;
+using ErsatzTV.Application.Filler;
 using ErsatzTV.Application.MediaCollections;
 using ErsatzTV.Application.MediaItems;
 using ErsatzTV.Core.Domain;
@@ -19,7 +20,12 @@ namespace ErsatzTV.Application.ProgramSchedules
             NamedMediaItemViewModel mediaItem,
             PlaybackOrder playbackOrder,
             string customTitle,
-            GuideMode guideMode) : base(
+            GuideMode guideMode,
+            FillerPresetViewModel preRollFiller,
+            FillerPresetViewModel midRollFiller,
+            FillerPresetViewModel postRollFiller,
+            FillerPresetViewModel tailFiller,
+            FillerPresetViewModel fallbackFiller) : base(
             id,
             index,
             startType,
@@ -32,7 +38,12 @@ namespace ErsatzTV.Application.ProgramSchedules
             mediaItem,
             playbackOrder,
             customTitle,
-            guideMode)
+            guideMode,
+            preRollFiller,
+            midRollFiller,
+            postRollFiller,
+            tailFiller,
+            fallbackFiller)
         {
         }
     }

ErsatzTV.Application/ProgramSchedules/ProgramScheduleItemViewModel.cs

@@ -1,4 +1,5 @@
 using System;
+using ErsatzTV.Application.Filler;
 using ErsatzTV.Application.MediaCollections;
 using ErsatzTV.Application.MediaItems;
 using ErsatzTV.Core.Domain;
@@ -18,7 +19,12 @@ namespace ErsatzTV.Application.ProgramSchedules
         NamedMediaItemViewModel MediaItem,
         PlaybackOrder PlaybackOrder,
         string CustomTitle,
-        GuideMode GuideMode)
+        GuideMode GuideMode,
+        FillerPresetViewModel PreRollFiller,
+        FillerPresetViewModel MidRollFiller,
+        FillerPresetViewModel PostRollFiller,
+        FillerPresetViewModel TailFiller,
+        FillerPresetViewModel FallbackFiller)
     {
         public string Name => CollectionType switch
         {

ErsatzTV.Application/ProgramSchedules/Queries/GetProgramScheduleItemsHandler.cs

@@ -30,10 +30,6 @@ namespace ErsatzTV.Application.ProgramSchedules.Queries
                 .Include(i => i.MultiCollection)
                 .Include(i => i.SmartCollection)
                 .Include(i => i.MediaItem)
-                .Include(i => (i as ProgramScheduleItemDuration).TailCollection)
-                .Include(i => (i as ProgramScheduleItemDuration).TailMultiCollection)
-                .Include(i => (i as ProgramScheduleItemDuration).TailSmartCollection)
-                .Include(i => (i as ProgramScheduleItemDuration).TailMediaItem)
                 .ThenInclude(i => (i as Movie).MovieMetadata)
                 .ThenInclude(mm => mm.Artwork)
                 .Include(i => i.MediaItem)
@@ -49,6 +45,11 @@ namespace ErsatzTV.Application.ProgramSchedules.Queries
                 .Include(i => i.MediaItem)
                 .ThenInclude(i => (i as Artist).ArtistMetadata)
                 .ThenInclude(am => am.Artwork)
+                .Include(i => i.PreRollFiller)
+                .Include(i => i.MidRollFiller)
+                .Include(i => i.PostRollFiller)
+                .Include(i => i.TailFiller)
+                .Include(i => i.FallbackFiller)
                 .ToListAsync(cancellationToken)
                 .Map(programScheduleItems => programScheduleItems.Map(ProjectToViewModel).ToList());
         }

ErsatzTV.Application/Search/Commands/RebuildSearchIndexHandler.cs

@@ -44,18 +44,18 @@ namespace ErsatzTV.Application.Search.Commands
                 await _configElementRepository.GetValue<int>(ConfigElementKey.SearchIndexVersion) <
                 _searchIndex.Version)
             {
-                _logger.LogDebug("Migrating search index to version {Version}", _searchIndex.Version);
+                _logger.LogInformation("Migrating search index to version {Version}", _searchIndex.Version);
 
                 List<int> itemIds = await _searchRepository.GetItemIdsToIndex();
                 await _searchIndex.Rebuild(_searchRepository, itemIds);
 
                 await _configElementRepository.Upsert(ConfigElementKey.SearchIndexVersion, _searchIndex.Version);
 
-                _logger.LogDebug("Done migrating search index");
+                _logger.LogInformation("Done migrating search index");
             }
             else
             {
-                _logger.LogDebug("Search index is already version {Version}", _searchIndex.Version);
+                _logger.LogInformation("Search index is already version {Version}", _searchIndex.Version);
             }
 
             return Unit.Default;

ErsatzTV.Application/Streaming/Commands/StartFFmpegSessionHandler.cs

@@ -83,7 +83,7 @@ namespace ErsatzTV.Application.Streaming.Commands
         private Task<Validation<BaseError, Unit>> SessionMustBeInactive(StartFFmpegSession request)
         {
             var result = Optional(_ffmpegSegmenterService.SessionWorkers.TryAdd(request.ChannelNumber, null))
-                .Filter(success => success)
+                .Where(success => success)
                 .Map(_ => Unit.Default)
                 .ToValidation<BaseError>(new ChannelSessionAlreadyActive());
 

ErsatzTV.Application/Streaming/HlsSessionWorker.cs

@@ -161,7 +161,7 @@ namespace ErsatzTV.Application.Streaming
 
                     Process process = processModel.Process;
 
-                    _logger.LogDebug(
+                    _logger.LogInformation(
                         "ffmpeg hls arguments {FFmpegArguments}",
                         string.Join(" ", process.StartInfo.ArgumentList));
 

ErsatzTV.Application/Streaming/Queries/GetPlayoutItemProcessByChannelNumberHandler.cs

@@ -1,17 +1,21 @@
 using System;
+using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
 using System.Runtime.InteropServices;
 using System.Threading.Tasks;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
 using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.FFmpeg;
 using ErsatzTV.Core.Interfaces.Emby;
 using ErsatzTV.Core.Interfaces.Jellyfin;
 using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Plex;
+using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Interfaces.Runtime;
+using ErsatzTV.Core.Scheduling;
 using ErsatzTV.Infrastructure.Data;
 using ErsatzTV.Infrastructure.Extensions;
 using LanguageExt;
@@ -24,6 +28,9 @@ namespace ErsatzTV.Application.Streaming.Queries
         FFmpegProcessHandler<GetPlayoutItemProcessByChannelNumber>
     {
         private readonly IEmbyPathReplacementService _embyPathReplacementService;
+        private readonly IMediaCollectionRepository _mediaCollectionRepository;
+        private readonly ITelevisionRepository _televisionRepository;
+        private readonly IArtistRepository _artistRepository;
         private readonly FFmpegProcessService _ffmpegProcessService;
         private readonly IJellyfinPathReplacementService _jellyfinPathReplacementService;
         private readonly ILocalFileSystem _localFileSystem;
@@ -37,6 +44,9 @@ namespace ErsatzTV.Application.Streaming.Queries
             IPlexPathReplacementService plexPathReplacementService,
             IJellyfinPathReplacementService jellyfinPathReplacementService,
             IEmbyPathReplacementService embyPathReplacementService,
+            IMediaCollectionRepository mediaCollectionRepository,
+            ITelevisionRepository televisionRepository,
+            IArtistRepository artistRepository,
             IRuntimeInfo runtimeInfo)
             : base(dbContextFactory)
         {
@@ -45,6 +55,9 @@ namespace ErsatzTV.Application.Streaming.Queries
             _plexPathReplacementService = plexPathReplacementService;
             _jellyfinPathReplacementService = jellyfinPathReplacementService;
             _embyPathReplacementService = embyPathReplacementService;
+            _mediaCollectionRepository = mediaCollectionRepository;
+            _televisionRepository = televisionRepository;
+            _artistRepository = artistRepository;
             _runtimeInfo = runtimeInfo;
         }
 
@@ -85,6 +98,11 @@ namespace ErsatzTV.Application.Streaming.Queries
                 .Map(o => o.ToEither<BaseError>(new UnableToLocatePlayoutItem()))
                 .BindT(ValidatePlayoutItemPath);
 
+            if (maybePlayoutItem.LeftAsEnumerable().Any(e => e is UnableToLocatePlayoutItem))
+            {
+                maybePlayoutItem = await CheckForFallbackFiller(dbContext, channel, now);
+            }
+
             return await maybePlayoutItem.Match(
                 async playoutItemWithPath =>
                 {
@@ -114,11 +132,15 @@ namespace ErsatzTV.Application.Streaming.Queries
                         version,
                         playoutItemWithPath.Path,
                         playoutItemWithPath.PlayoutItem.StartOffset,
+                        playoutItemWithPath.PlayoutItem.FinishOffset,
                         request.StartAtZero ? playoutItemWithPath.PlayoutItem.StartOffset : now,
                         maybeGlobalWatermark,
                         channel.FFmpegProfile.VaapiDriver,
                         channel.FFmpegProfile.VaapiDevice,
-                        request.HlsRealtime);
+                        request.HlsRealtime,
+                        playoutItemWithPath.PlayoutItem.FillerKind,
+                        playoutItemWithPath.PlayoutItem.InPoint,
+                        playoutItemWithPath.PlayoutItem.OutPoint);
 
                     var result = new PlayoutItemProcessModel(process, playoutItemWithPath.PlayoutItem.FinishOffset);
 
@@ -130,7 +152,7 @@ namespace ErsatzTV.Application.Streaming.Queries
                         $"offline image is unavailable because transcoding is disabled in ffmpeg profile '{channel.FFmpegProfile.Name}'";
 
                     Option<TimeSpan> maybeDuration = await Optional(channel.FFmpegProfile.Transcode)
-                        .Filter(transcode => transcode)
+                        .Where(transcode => transcode)
                         .Match(
                             _ => dbContext.PlayoutItems
                                 .Filter(pi => pi.Playout.ChannelId == channel.Id)
@@ -154,8 +176,7 @@ namespace ErsatzTV.Application.Streaming.Queries
                                     maybeDuration,
                                     "Channel is Offline",
                                     request.HlsRealtime);
-
-
+                                
                                 return new PlayoutItemProcessModel(errorProcess, finish);
                             }
                             else
@@ -207,6 +228,95 @@ namespace ErsatzTV.Application.Streaming.Queries
                 });
         }
 
+        private async Task<Either<BaseError, PlayoutItemWithPath>> CheckForFallbackFiller(
+            TvContext dbContext,
+            Channel channel,
+            DateTimeOffset now)
+        {
+            // check for channel fallback
+            Option<FillerPreset> maybeFallback = await dbContext.FillerPresets
+                .SelectOneAsync(w => w.Id, w => w.Id == channel.FallbackFillerId);
+
+            // then check for global fallback
+            if (maybeFallback.IsNone)
+            {
+                maybeFallback = await dbContext.ConfigElements
+                    .GetValue<int>(ConfigElementKey.FFmpegGlobalFallbackFillerId)
+                    .BindT(fillerId => dbContext.FillerPresets.SelectOneAsync(w => w.Id, w => w.Id == fillerId));
+            }
+
+            foreach (FillerPreset fallbackPreset in maybeFallback)
+            {
+                // turn this into a playout item
+
+                var collectionKey = CollectionKey.ForFillerPreset(fallbackPreset);
+                List<MediaItem> items = await MediaItemsForCollection.Collect(
+                    _mediaCollectionRepository,
+                    _televisionRepository,
+                    _artistRepository,
+                    collectionKey);
+
+                // TODO: shuffle? does it really matter since we loop anyway
+                MediaItem item = items[new Random().Next(items.Count)];
+                
+                Option<TimeSpan> maybeDuration = await Optional(channel.FFmpegProfile.Transcode)
+                    .Where(transcode => transcode)
+                    .Match(
+                        _ => dbContext.PlayoutItems
+                            .Filter(pi => pi.Playout.ChannelId == channel.Id)
+                            .Filter(pi => pi.Start > now.UtcDateTime)
+                            .OrderBy(pi => pi.Start)
+                            .FirstOrDefaultAsync()
+                            .Map(Optional)
+                            .MapT(pi => pi.StartOffset - now),
+                        () => Option<TimeSpan>.None.AsTask());
+
+                MediaVersion version = item switch
+                {
+                    Movie m => m.MediaVersions.Head(),
+                    Episode e => e.MediaVersions.Head(),
+                    MusicVideo mv => mv.MediaVersions.Head(),
+                    OtherVideo ov => ov.MediaVersions.Head(),
+                    _ => throw new ArgumentOutOfRangeException(nameof(item))
+                };
+
+                version.MediaFiles = await dbContext.MediaFiles
+                    .AsNoTracking()
+                    .Filter(mf => mf.MediaVersionId == version.Id)
+                    .ToListAsync();
+
+                version.Streams = await dbContext.MediaStreams
+                    .AsNoTracking()
+                    .Filter(ms => ms.MediaVersionId == version.Id)
+                    .ToListAsync();
+
+                DateTimeOffset finish = maybeDuration.Match(
+                    // next playout item exists
+                    // loop until it starts
+                    now.Add,
+                    // no next playout item exists
+                    // loop for 5 minutes if less than 30s, otherwise play full item
+                    () => version.Duration < TimeSpan.FromSeconds(30)
+                        ? now.AddMinutes(5)
+                        : now.Add(version.Duration));
+
+                var playoutItem = new PlayoutItem
+                {
+                    MediaItem = item,
+                    MediaItemId = item.Id,
+                    Start = now.UtcDateTime,
+                    Finish = finish.UtcDateTime,
+                    FillerKind = FillerKind.Fallback,
+                    InPoint = TimeSpan.Zero,
+                    OutPoint = version.Duration
+                };
+                
+                return await ValidatePlayoutItemPath(playoutItem);
+            }
+
+            return new UnableToLocatePlayoutItem();
+        }
+
         private async Task<Either<BaseError, PlayoutItemWithPath>> ValidatePlayoutItemPath(PlayoutItem playoutItem)
         {
             string path = await GetPlayoutItemPath(playoutItem);

ErsatzTV.Core.Tests/ErsatzTV.Core.Tests.csproj

@@ -6,10 +6,10 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="FluentAssertions" Version="6.1.0" />
-      <PackageReference Include="LanguageExt.Core" Version="3.4.15" />
+      <PackageReference Include="FluentAssertions" Version="6.2.0" />
+      <PackageReference Include="LanguageExt.Core" Version="4.0.3" />
       <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="5.0.2" />
-      <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
+      <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
       <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.0.63">
         <PrivateAssets>all</PrivateAssets>
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>

ErsatzTV.Core.Tests/FFmpeg/FFmpegPlaybackSettingsCalculatorTests.cs

@@ -29,7 +29,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ThreadCount.Should().Be(7);
             }
@@ -46,7 +48,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ThreadCount.Should().Be(7);
             }
@@ -63,7 +67,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 string[] expected = { "+genpts", "+discardcorrupt", "+igndts" };
                 actual.FormatFlags.Count.Should().Be(expected.Length);
@@ -82,7 +88,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 string[] expected = { "+genpts", "+discardcorrupt", "+igndts" };
                 actual.FormatFlags.Count.Should().Be(expected.Length);
@@ -101,7 +109,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.RealtimeOutput.Should().BeTrue();
             }
@@ -118,7 +128,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.RealtimeOutput.Should().BeTrue();
             }
@@ -137,7 +149,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     now,
-                    now.AddMinutes(5));
+                    now.AddMinutes(5),
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.StreamSeek.IsSome.Should().BeTrue();
                 actual.StreamSeek.IfNone(TimeSpan.Zero).Should().Be(TimeSpan.FromMinutes(5));
@@ -157,7 +171,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     now,
-                    now.AddMinutes(5));
+                    now.AddMinutes(5),
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.StreamSeek.IsSome.Should().BeTrue();
                 actual.StreamSeek.IfNone(TimeSpan.Zero).Should().Be(TimeSpan.FromMinutes(5));
@@ -175,7 +191,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
             }
@@ -199,7 +217,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
             }
@@ -223,7 +243,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
             }
@@ -247,7 +269,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeFalse();
@@ -273,7 +297,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeTrue();
@@ -298,7 +324,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 IDisplaySize scaledSize = actual.ScaledSize.IfNone(new MediaVersion { Width = 0, Height = 0 });
                 scaledSize.Width.Should().Be(1280);
@@ -326,7 +354,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeFalse();
@@ -352,7 +382,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeFalse();
@@ -379,7 +411,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeTrue();
@@ -409,7 +443,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream { Codec = "mpeg2video" },
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeFalse();
@@ -439,7 +475,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream { Codec = "mpeg2video" },
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeFalse();
@@ -468,7 +506,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream { Codec = "libx264" },
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeFalse();
@@ -498,7 +538,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream { Codec = "mpeg2video" },
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeFalse();
@@ -530,7 +572,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream { Codec = "mpeg2video" },
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeFalse();
@@ -560,7 +604,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeTrue();
@@ -589,7 +635,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream { Codec = "mpeg2video" },
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeFalse();
@@ -617,7 +665,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeTrue();
@@ -647,7 +697,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream { Codec = "mpeg2video" },
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.ScaledSize.IsNone.Should().BeTrue();
                 actual.PadToDesiredResolution.Should().BeFalse();
@@ -673,7 +725,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "aac" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.AudioCodec.Should().Be("aac");
             }
@@ -696,7 +750,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.AudioCodec.Should().Be("copy");
             }
@@ -720,7 +776,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.AudioCodec.Should().Be("aac");
             }
@@ -744,7 +802,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.AudioCodec.Should().Be("copy");
             }
@@ -769,7 +829,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.AudioBitrate.IfNone(0).Should().Be(2424);
             }
@@ -794,7 +856,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.AudioBufferSize.IfNone(0).Should().Be(2424);
             }
@@ -819,7 +883,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.AudioChannels.IfNone(0).Should().Be(6);
             }
@@ -844,7 +910,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.AudioSampleRate.IfNone(0).Should().Be(48);
             }
@@ -868,7 +936,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.AudioChannels.IfNone(0).Should().Be(6);
             }
@@ -892,7 +962,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.AudioSampleRate.IfNone(0).Should().Be(48);
             }
@@ -908,7 +980,7 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     AudioCodec = "ac3"
                 };
 
-                var version = new MediaVersion { Duration = TimeSpan.FromMinutes(2) };
+                var version = new MediaVersion { Duration = TimeSpan.FromMinutes(5) }; // not pulled from here
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
@@ -917,7 +989,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.FromMinutes(2));
 
                 actual.AudioDuration.IfNone(TimeSpan.MinValue).Should().Be(TimeSpan.FromMinutes(2));
             }
@@ -941,7 +1015,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.NormalizeLoudness.Should().BeTrue();
             }
@@ -965,7 +1041,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.NormalizeLoudness.Should().BeFalse();
             }
@@ -991,7 +1069,9 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     new MediaStream(),
                     new MediaStream(),
                     DateTimeOffset.Now,
-                    DateTimeOffset.Now);
+                    DateTimeOffset.Now,
+                    TimeSpan.Zero,
+                    TimeSpan.Zero);
 
                 actual.HardwareAcceleration.Should().Be(HardwareAccelerationKind.Qsv);
             }

ErsatzTV.Core.Tests/FFmpeg/TranscodingTests.cs

@@ -5,6 +5,7 @@ using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
 using ErsatzTV.Core.FFmpeg;
 using ErsatzTV.Core.Interfaces.FFmpeg;
 using ErsatzTV.Core.Interfaces.Images;
@@ -184,11 +185,15 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                 v,
                 file,
                 now,
+                now + TimeSpan.FromSeconds(5),
                 now,
                 None,
                 VaapiDriver.Default,
                 "/dev/dri/renderD128",
-                false);
+                false,
+                FillerKind.None,
+                TimeSpan.Zero,
+                TimeSpan.FromSeconds(5));
 
             process.StartInfo.RedirectStandardError = true;
 

ErsatzTV.Core.Tests/Metadata/LocalStatisticsProviderTests.cs

@@ -26,7 +26,8 @@ namespace ErsatzTV.Core.Tests.Metadata
 
             var input = new LocalStatisticsProvider.FFprobe(
                 new LocalStatisticsProvider.FFprobeFormat("123.45"),
-                new List<LocalStatisticsProvider.FFprobeStream>());
+                new List<LocalStatisticsProvider.FFprobeStream>(),
+                new List<LocalStatisticsProvider.FFprobeChapter>());
 
             MediaVersion result = provider.ProjectToMediaVersion("test", input);
 

ErsatzTV.Core.Tests/Scheduling/PlayoutBuilderTests.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Scheduling;
 using ErsatzTV.Core.Tests.Fakes;
@@ -1164,7 +1165,7 @@ namespace ErsatzTV.Core.Tests.Scheduling
                     TestMovie(1, TimeSpan.FromMinutes(55), new DateTime(2020, 1, 1))
                 }
             };
-
+            
             var collectionTwo = new Collection
             {
                 Id = 2,
@@ -1174,7 +1175,7 @@ namespace ErsatzTV.Core.Tests.Scheduling
                     TestMovie(2, TimeSpan.FromMinutes(55), new DateTime(2020, 1, 1))
                 }
             };
-
+            
             var collectionThree = new Collection
             {
                 Id = 3,
@@ -1184,13 +1185,13 @@ namespace ErsatzTV.Core.Tests.Scheduling
                     TestMovie(3, TimeSpan.FromMinutes(5), new DateTime(2020, 1, 1))
                 }
             };
-
+            
             var fakeRepository = new FakeMediaCollectionRepository(
                 Map(
                     (collectionOne.Id, collectionOne.MediaItems.ToList()),
                     (collectionTwo.Id, collectionTwo.MediaItems.ToList()),
                     (collectionThree.Id, collectionThree.MediaItems.ToList())));
-
+            
             var items = new List<ProgramScheduleItem>
             {
                 new ProgramScheduleItemDuration
@@ -1203,9 +1204,12 @@ namespace ErsatzTV.Core.Tests.Scheduling
                     PlayoutDuration = TimeSpan.FromHours(3),
                     PlaybackOrder = PlaybackOrder.Chronological,
                     TailMode = TailMode.Filler,
-                    TailCollectionType = ProgramScheduleItemCollectionType.Collection,
-                    TailCollection = collectionThree,
-                    TailCollectionId = collectionThree.Id
+                    TailFiller = new FillerPreset
+                    {
+                        FillerKind = FillerKind.Tail,
+                        Collection = collectionThree,
+                        CollectionId = collectionThree.Id
+                    }
                 },
                 new ProgramScheduleItemDuration
                 {
@@ -1217,12 +1221,15 @@ namespace ErsatzTV.Core.Tests.Scheduling
                     PlayoutDuration = TimeSpan.FromHours(3),
                     PlaybackOrder = PlaybackOrder.Chronological,
                     TailMode = TailMode.Filler,
-                    TailCollectionType = ProgramScheduleItemCollectionType.Collection,
-                    TailCollection = collectionThree,
-                    TailCollectionId = collectionThree.Id
+                    TailFiller = new FillerPreset
+                    {
+                        FillerKind = FillerKind.Tail,
+                        Collection = collectionThree,
+                        CollectionId = collectionThree.Id
+                    }
                 }
             };
-
+            
             var playout = new Playout
             {
                 ProgramSchedule = new ProgramSchedule
@@ -1231,7 +1238,7 @@ namespace ErsatzTV.Core.Tests.Scheduling
                 },
                 Channel = new Channel(Guid.Empty) { Id = 1, Name = "Test Channel" },
             };
-
+            
             var configRepo = new Mock<IConfigElementRepository>();
             var televisionRepo = new FakeTelevisionRepository();
             var artistRepo = new Mock<IArtistRepository>();
@@ -1241,42 +1248,42 @@ namespace ErsatzTV.Core.Tests.Scheduling
                 televisionRepo,
                 artistRepo.Object,
                 _logger);
-
+            
             DateTimeOffset start = HoursAfterMidnight(0);
             DateTimeOffset finish = start + TimeSpan.FromHours(6);
-
+            
             Playout result = await builder.BuildPlayoutItems(playout, start, finish);
-
+            
             result.Items.Count.Should().Be(12);
-
+            
             result.Items[0].StartOffset.TimeOfDay.Should().Be(TimeSpan.FromMinutes(0));
             result.Items[0].MediaItemId.Should().Be(1);
             result.Items[1].StartOffset.TimeOfDay.Should().Be(TimeSpan.FromMinutes(55));
             result.Items[1].MediaItemId.Should().Be(1);
             result.Items[2].StartOffset.TimeOfDay.Should().Be(new TimeSpan(1, 50, 0));
             result.Items[2].MediaItemId.Should().Be(1);
-
+            
             result.Items[3].StartOffset.TimeOfDay.Should().Be(new TimeSpan(2, 45, 0));
             result.Items[3].MediaItemId.Should().Be(3);
             result.Items[4].StartOffset.TimeOfDay.Should().Be(new TimeSpan(2, 50, 0));
             result.Items[4].MediaItemId.Should().Be(3);
             result.Items[5].StartOffset.TimeOfDay.Should().Be(new TimeSpan(2, 55, 0));
             result.Items[5].MediaItemId.Should().Be(3);
-
+            
             result.Items[6].StartOffset.TimeOfDay.Should().Be(TimeSpan.FromHours(3));
             result.Items[6].MediaItemId.Should().Be(2);
             result.Items[7].StartOffset.TimeOfDay.Should().Be(new TimeSpan(3, 55, 0));
             result.Items[7].MediaItemId.Should().Be(2);
             result.Items[8].StartOffset.TimeOfDay.Should().Be(new TimeSpan(4, 50, 0));
             result.Items[8].MediaItemId.Should().Be(2);
-
+            
             result.Items[9].StartOffset.TimeOfDay.Should().Be(new TimeSpan(5, 45, 0));
             result.Items[9].MediaItemId.Should().Be(3);
             result.Items[10].StartOffset.TimeOfDay.Should().Be(new TimeSpan(5, 50, 0));
             result.Items[10].MediaItemId.Should().Be(3);
             result.Items[11].StartOffset.TimeOfDay.Should().Be(new TimeSpan(5, 55, 0));
             result.Items[11].MediaItemId.Should().Be(3);
-
+            
             result.Anchor.NextScheduleItem.Should().Be(items[0]);
             result.Anchor.DurationFinish.Should().BeNull();
         }

ErsatzTV.Core.Tests/Scheduling/PlayoutModeSchedulerBaseTests.cs

@@ -0,0 +1,205 @@
+using System;
+using System.Collections.Generic;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
+using ErsatzTV.Core.Interfaces.Scheduling;
+using ErsatzTV.Core.Scheduling;
+using FluentAssertions;
+using NUnit.Framework;
+
+namespace ErsatzTV.Core.Tests.Scheduling
+{
+    [TestFixture]
+    public class PlayoutModeSchedulerBaseTests
+    {
+        [Test]
+        public void CalculateEndTimeWithFiller_Should_Not_Touch_Enumerator()
+        {
+            var collection = new Collection
+            {
+                Id = 1,
+                Name = "Filler Items",
+                MediaItems = new List<MediaItem>()
+            };
+
+            for (var i = 0; i < 5; i++)
+            {
+                collection.MediaItems.Add(TestMovie(i + 1, TimeSpan.FromHours(i + 1), new DateTime(2020, 2, i + 1)));
+            }
+
+            var fillerPreset = new FillerPreset
+            {
+                FillerKind = FillerKind.PreRoll,
+                FillerMode = FillerMode.Count,
+                Count = 3,
+                Collection = collection,
+                CollectionId = collection.Id
+            };
+
+            var enumerator = new ChronologicalMediaCollectionEnumerator(
+                collection.MediaItems,
+                new CollectionEnumeratorState { Index = 0, Seed = 1 });
+
+            DateTimeOffset result = PlayoutModeSchedulerBase<ProgramScheduleItem>
+                .CalculateEndTimeWithFiller(
+                    new Dictionary<CollectionKey, IMediaCollectionEnumerator>
+                    {
+                        { CollectionKey.ForFillerPreset(fillerPreset), enumerator }
+                    },
+                    new ProgramScheduleItemOne
+                    {
+                        PreRollFiller = fillerPreset
+                    },
+                    new DateTimeOffset(2020, 2, 1, 12, 0, 0, TimeSpan.FromHours(-5)),
+                    new TimeSpan(0, 12, 30),
+                    new List<MediaChapter>());
+
+            result.Should().Be(new DateTimeOffset(2020, 2, 1, 18, 12, 30, TimeSpan.FromHours(-5)));
+            enumerator.State.Index.Should().Be(0);
+            enumerator.State.Seed.Should().Be(1);
+        }
+
+        [Test]
+        public void CalculateEndTimeWithFiller_Should_Pad_To_15_Minutes_15()
+        {
+            DateTimeOffset result = PlayoutModeSchedulerBase<ProgramScheduleItem>
+                .CalculateEndTimeWithFiller(
+                    new Dictionary<CollectionKey, IMediaCollectionEnumerator>(),
+                    new ProgramScheduleItemOne
+                    {
+                        MidRollFiller = new FillerPreset
+                        {
+                            FillerKind = FillerKind.MidRoll,
+                            FillerMode = FillerMode.Pad,
+                            PadToNearestMinute = 15
+                        }
+                    },
+                    new DateTimeOffset(2020, 2, 1, 12, 0, 0, TimeSpan.FromHours(-5)),
+                    new TimeSpan(0, 12, 30),
+                    new List<MediaChapter>());
+
+            result.Should().Be(new DateTimeOffset(2020, 2, 1, 12, 15, 0, TimeSpan.FromHours(-5)));
+        }
+        
+        [Test]
+        public void CalculateEndTimeWithFiller_Should_Pad_To_15_Minutes_30()
+        {
+            DateTimeOffset result = PlayoutModeSchedulerBase<ProgramScheduleItem>
+                .CalculateEndTimeWithFiller(
+                    new Dictionary<CollectionKey, IMediaCollectionEnumerator>(),
+                    new ProgramScheduleItemOne
+                    {
+                        MidRollFiller = new FillerPreset
+                        {
+                            FillerKind = FillerKind.MidRoll,
+                            FillerMode = FillerMode.Pad,
+                            PadToNearestMinute = 15
+                        }
+                    },
+                    new DateTimeOffset(2020, 2, 1, 12, 16, 0, TimeSpan.FromHours(-5)),
+                    new TimeSpan(0, 12, 30),
+                    new List<MediaChapter>());
+
+            result.Should().Be(new DateTimeOffset(2020, 2, 1, 12, 30, 0, TimeSpan.FromHours(-5)));
+        }
+        
+        [Test]
+        public void CalculateEndTimeWithFiller_Should_Pad_To_15_Minutes_45()
+        {
+            DateTimeOffset result = PlayoutModeSchedulerBase<ProgramScheduleItem>
+                .CalculateEndTimeWithFiller(
+                    new Dictionary<CollectionKey, IMediaCollectionEnumerator>(),
+                    new ProgramScheduleItemOne
+                    {
+                        MidRollFiller = new FillerPreset
+                        {
+                            FillerKind = FillerKind.MidRoll,
+                            FillerMode = FillerMode.Pad,
+                            PadToNearestMinute = 15
+                        }
+                    },
+                    new DateTimeOffset(2020, 2, 1, 12, 30, 0, TimeSpan.FromHours(-5)),
+                    new TimeSpan(0, 12, 30),
+                    new List<MediaChapter>());
+
+            result.Should().Be(new DateTimeOffset(2020, 2, 1, 12, 45, 0, TimeSpan.FromHours(-5)));
+        }
+        
+        [Test]
+        public void CalculateEndTimeWithFiller_Should_Pad_To_15_Minutes_00()
+        {
+            DateTimeOffset result = PlayoutModeSchedulerBase<ProgramScheduleItem>
+                .CalculateEndTimeWithFiller(
+                    new Dictionary<CollectionKey, IMediaCollectionEnumerator>(),
+                    new ProgramScheduleItemOne
+                    {
+                        MidRollFiller = new FillerPreset
+                        {
+                            FillerKind = FillerKind.MidRoll,
+                            FillerMode = FillerMode.Pad,
+                            PadToNearestMinute = 15
+                        }
+                    },
+                    new DateTimeOffset(2020, 2, 1, 12, 46, 0, TimeSpan.FromHours(-5)),
+                    new TimeSpan(0, 12, 30),
+                    new List<MediaChapter>());
+
+            result.Should().Be(new DateTimeOffset(2020, 2, 1, 13, 0, 0, TimeSpan.FromHours(-5)));
+        }
+        
+        [Test]
+        public void CalculateEndTimeWithFiller_Should_Pad_To_30_Minutes_30()
+        {
+            DateTimeOffset result = PlayoutModeSchedulerBase<ProgramScheduleItem>
+                .CalculateEndTimeWithFiller(
+                    new Dictionary<CollectionKey, IMediaCollectionEnumerator>(),
+                    new ProgramScheduleItemOne
+                    {
+                        MidRollFiller = new FillerPreset
+                        {
+                            FillerKind = FillerKind.MidRoll,
+                            FillerMode = FillerMode.Pad,
+                            PadToNearestMinute = 30
+                        }
+                    },
+                    new DateTimeOffset(2020, 2, 1, 12, 0, 0, TimeSpan.FromHours(-5)),
+                    new TimeSpan(0, 12, 30),
+                    new List<MediaChapter>());
+
+            result.Should().Be(new DateTimeOffset(2020, 2, 1, 12, 30, 0, TimeSpan.FromHours(-5)));
+        }
+        
+        [Test]
+        public void CalculateEndTimeWithFiller_Should_Pad_To_30_Minutes_00()
+        {
+            DateTimeOffset result = PlayoutModeSchedulerBase<ProgramScheduleItem>
+                .CalculateEndTimeWithFiller(
+                    new Dictionary<CollectionKey, IMediaCollectionEnumerator>(),
+                    new ProgramScheduleItemOne
+                    {
+                        MidRollFiller = new FillerPreset
+                        {
+                            FillerKind = FillerKind.MidRoll,
+                            FillerMode = FillerMode.Pad,
+                            PadToNearestMinute = 30
+                        }
+                    },
+                    new DateTimeOffset(2020, 2, 1, 12, 20, 0, TimeSpan.FromHours(-5)),
+                    new TimeSpan(0, 12, 30),
+                    new List<MediaChapter>());
+
+            result.Should().Be(new DateTimeOffset(2020, 2, 1, 13, 0, 0, TimeSpan.FromHours(-5)));
+        }
+
+        private static Movie TestMovie(int id, TimeSpan duration, DateTime aired) =>
+            new()
+            {
+                Id = id,
+                MovieMetadata = new List<MovieMetadata> { new() { ReleaseDate = aired } },
+                MediaVersions = new List<MediaVersion>
+                {
+                    new() { Duration = duration }
+                }
+            };
+    }
+}

ErsatzTV.Core.Tests/Scheduling/PlayoutModeSchedulerDurationTests.cs

@@ -0,0 +1,584 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
+using ErsatzTV.Core.Scheduling;
+using FluentAssertions;
+using Microsoft.Extensions.Logging;
+using Moq;
+using NUnit.Framework;
+
+namespace ErsatzTV.Core.Tests.Scheduling
+{
+    [TestFixture]
+    public class PlayoutModeSchedulerDurationTests : SchedulerTestBase
+    {
+        [Test]
+        public void Should_Fill_Exact_Duration()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromHours(1));
+
+            var scheduleItem = new ProgramScheduleItemDuration
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlayoutDuration = TimeSpan.FromHours(3),
+                TailMode = TailMode.None,
+                PlaybackOrder = PlaybackOrder.Chronological
+            };
+
+            var enumerator = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+            
+            var scheduler = new PlayoutModeSchedulerDuration(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(3);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[0].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddHours(1));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[1].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.AddHours(2));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[2].GuideFinish.HasValue.Should().BeTrue();
+        }
+        
+        [Test]
+        public void Should_Not_Have_Gap_Duration_Tail_Mode_None()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+
+            var scheduleItem = new ProgramScheduleItemDuration
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlayoutDuration = TimeSpan.FromHours(3),
+                TailMode = TailMode.None,
+                PlaybackOrder = PlaybackOrder.Chronological
+            };
+
+            var enumerator = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+            
+            var scheduler = new PlayoutModeSchedulerDuration(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+            
+            enumerator.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(3);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[0].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[1].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[2].GuideFinish.HasValue.Should().BeTrue();
+        }
+        
+        [Test]
+        public void Should_Have_Gap_Duration_Tail_Mode_Offline_No_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+
+            var scheduleItem = new ProgramScheduleItemDuration
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlayoutDuration = TimeSpan.FromHours(3),
+                TailMode = TailMode.Offline,
+                PlaybackOrder = PlaybackOrder.Chronological
+            };
+
+            var enumerator = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+            
+            var scheduler = new PlayoutModeSchedulerDuration(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            // duration block should end after exact duration, with gap
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+            
+            enumerator.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(3);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[0].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[1].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[2].GuideFinish.HasValue.Should().BeTrue();
+        }
+        
+        [Test]
+        public void Should_Not_Have_Gap_Duration_Tail_Mode_Offline_With_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(1));
+
+            var scheduleItem = new ProgramScheduleItemDuration
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlayoutDuration = TimeSpan.FromHours(3),
+                TailMode = TailMode.Offline,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Fallback,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+            
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+            
+            var scheduler = new PlayoutModeSchedulerDuration(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.FallbackFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+            
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(4);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[0].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[1].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[2].GuideFinish.HasValue.Should().BeTrue();
+            
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[3].GuideGroup.Should().Be(3);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Fallback);
+            playoutItems[3].GuideFinish.HasValue.Should().BeFalse();
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_Duration_Tail_Mode_Filler_Exact_Duration()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(5));
+
+            var scheduleItem = new ProgramScheduleItemDuration
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlayoutDuration = TimeSpan.FromHours(3),
+                TailMode = TailMode.Filler,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+            
+            var scheduler = new PlayoutModeSchedulerDuration(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.TailFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+            
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(6);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[0].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[1].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[2].GuideFinish.HasValue.Should().BeTrue();
+
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[3].GuideGroup.Should().Be(3);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Tail);
+            playoutItems[3].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[4].MediaItemId.Should().Be(4);
+            playoutItems[4].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 50, 0)));
+            playoutItems[4].GuideGroup.Should().Be(3);
+            playoutItems[4].FillerKind.Should().Be(FillerKind.Tail);
+            playoutItems[3].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[5].MediaItemId.Should().Be(3);
+            playoutItems[5].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 55, 0)));
+            playoutItems[5].GuideGroup.Should().Be(3);
+            playoutItems[5].FillerKind.Should().Be(FillerKind.Tail);
+            playoutItems[3].GuideFinish.HasValue.Should().BeFalse();
+        }
+        
+        [Test]
+        public void Should_Have_Gap_Duration_Tail_Mode_Filler_No_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(4));
+
+            var scheduleItem = new ProgramScheduleItemDuration
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlayoutDuration = TimeSpan.FromHours(3),
+                TailMode = TailMode.Filler,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+            
+            var scheduler = new PlayoutModeSchedulerDuration(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.TailFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 57, 0)));
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+            
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(6);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[0].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[1].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[2].GuideFinish.HasValue.Should().BeTrue();
+
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[3].GuideGroup.Should().Be(3);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Tail);
+            playoutItems[3].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[4].MediaItemId.Should().Be(4);
+            playoutItems[4].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 49, 0)));
+            playoutItems[4].GuideGroup.Should().Be(3);
+            playoutItems[4].FillerKind.Should().Be(FillerKind.Tail);
+            playoutItems[4].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[5].MediaItemId.Should().Be(3);
+            playoutItems[5].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 53, 0)));
+            playoutItems[5].GuideGroup.Should().Be(3);
+            playoutItems[5].FillerKind.Should().Be(FillerKind.Tail);
+            playoutItems[5].GuideFinish.HasValue.Should().BeFalse();
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_Duration_Tail_Mode_Filler_With_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(4));
+            Collection collectionThree = TwoItemCollection(5, 6, TimeSpan.FromMinutes(1));
+
+            var scheduleItem = new ProgramScheduleItemDuration
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlayoutDuration = TimeSpan.FromHours(3),
+                TailMode = TailMode.Filler,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Fallback,
+                    Collection = collectionThree,
+                    CollectionId = collectionThree.Id
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator3 = new ChronologicalMediaCollectionEnumerator(
+                collectionThree.MediaItems,
+                new CollectionEnumeratorState());
+            
+            var scheduler = new PlayoutModeSchedulerDuration(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(
+                    scheduleItem,
+                    enumerator1,
+                    scheduleItem.TailFiller,
+                    enumerator2,
+                    scheduleItem.FallbackFiller,
+                    enumerator3),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+            
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+            enumerator3.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(7);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[0].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[1].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+            playoutItems[2].GuideFinish.HasValue.Should().BeTrue();
+
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[3].GuideGroup.Should().Be(3);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Tail);
+            playoutItems[3].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[4].MediaItemId.Should().Be(4);
+            playoutItems[4].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 49, 0)));
+            playoutItems[4].GuideGroup.Should().Be(3);
+            playoutItems[4].FillerKind.Should().Be(FillerKind.Tail);
+            playoutItems[4].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[5].MediaItemId.Should().Be(3);
+            playoutItems[5].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 53, 0)));
+            playoutItems[5].GuideGroup.Should().Be(3);
+            playoutItems[5].FillerKind.Should().Be(FillerKind.Tail);
+            playoutItems[5].GuideFinish.HasValue.Should().BeFalse();
+
+            playoutItems[6].MediaItemId.Should().Be(5);
+            playoutItems[6].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 57, 0)));
+            playoutItems[6].GuideGroup.Should().Be(3);
+            playoutItems[6].FillerKind.Should().Be(FillerKind.Fallback);
+            playoutItems[6].GuideFinish.HasValue.Should().BeFalse();
+        }
+    }
+}

ErsatzTV.Core.Tests/Scheduling/PlayoutModeSchedulerFloodTests.cs

@@ -0,0 +1,715 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
+using ErsatzTV.Core.Scheduling;
+using FluentAssertions;
+using Microsoft.Extensions.Logging;
+using Moq;
+using NUnit.Framework;
+
+namespace ErsatzTV.Core.Tests.Scheduling
+{
+    [TestFixture]
+    public class PlayoutModeSchedulerFloodTests : SchedulerTestBase
+    {
+        [Test]
+        public void Should_Fill_Exactly_To_Next_Schedule_Item()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromHours(1));
+
+            var scheduleItem = new ProgramScheduleItemFlood
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = null,
+                FallbackFiller = null
+            };
+
+            var enumerator = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var sortedScheduleItems = new List<ProgramScheduleItem>
+            {
+                scheduleItem,
+                NextScheduleItem
+            };
+
+            var scheduler = new PlayoutModeSchedulerFlood(sortedScheduleItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(3);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddHours(1));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.AddHours(2));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+        }
+        
+        [Test]
+        public void Should_Fill_Exactly_To_Next_Schedule_Item_With_Post_Roll_Multiple_One()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(5));
+
+            var scheduleItem = new ProgramScheduleItemFlood
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                PostRollFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.PostRoll,
+                    FillerMode = FillerMode.Count,
+                    Count = 1,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                TailFiller = null,
+                FallbackFiller = null
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var sortedScheduleItems = new List<ProgramScheduleItem>
+            {
+                scheduleItem,
+                NextScheduleItem
+            };
+
+            var scheduler = new PlayoutModeSchedulerFlood(sortedScheduleItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.PostRollFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(6);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(3);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(1);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.PostRoll);
+
+            playoutItems[2].MediaItemId.Should().Be(2);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.AddHours(1));
+            playoutItems[2].GuideGroup.Should().Be(2);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[3].MediaItemId.Should().Be(4);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 55, 0)));
+            playoutItems[3].GuideGroup.Should().Be(2);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.PostRoll);
+
+            playoutItems[4].MediaItemId.Should().Be(1);
+            playoutItems[4].StartOffset.Should().Be(StartState.CurrentTime.AddHours(2));
+            playoutItems[4].GuideGroup.Should().Be(3);
+            playoutItems[4].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[5].MediaItemId.Should().Be(3);
+            playoutItems[5].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 55, 0)));
+            playoutItems[5].GuideGroup.Should().Be(3);
+            playoutItems[5].FillerKind.Should().Be(FillerKind.PostRoll);
+        }
+
+        [Test]
+        public void Should_Have_Gap_With_No_Tail_No_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+
+            var scheduleItem = new ProgramScheduleItemFlood
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = null,
+                FallbackFiller = null
+            };
+
+            var enumerator = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var sortedScheduleItems = new List<ProgramScheduleItem>
+            {
+                scheduleItem,
+                NextScheduleItem
+            };
+
+            var scheduler = new PlayoutModeSchedulerFlood(sortedScheduleItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(3);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_With_Exact_Tail()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(5));
+
+            var scheduleItem = new ProgramScheduleItemFlood
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = null
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var sortedScheduleItems = new List<ProgramScheduleItem>
+            {
+                scheduleItem,
+                NextScheduleItem
+            };
+
+            var scheduler = new PlayoutModeSchedulerFlood(sortedScheduleItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.TailFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(6);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[3].GuideGroup.Should().Be(3);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[4].MediaItemId.Should().Be(4);
+            playoutItems[4].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 50, 0)));
+            playoutItems[4].GuideGroup.Should().Be(3);
+            playoutItems[4].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[5].MediaItemId.Should().Be(3);
+            playoutItems[5].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 55, 0)));
+            playoutItems[5].GuideGroup.Should().Be(3);
+            playoutItems[5].FillerKind.Should().Be(FillerKind.Tail);
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_With_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(5));
+
+            var scheduleItem = new ProgramScheduleItemFlood
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = null,
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var sortedScheduleItems = new List<ProgramScheduleItem>
+            {
+                scheduleItem,
+                NextScheduleItem
+            };
+
+            var scheduler = new PlayoutModeSchedulerFlood(sortedScheduleItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.FallbackFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(4);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[3].GuideGroup.Should().Be(3);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Fallback);
+        }
+        
+        [Test]
+        public void Should_Have_Gap_With_Tail_No_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(4));
+
+            var scheduleItem = new ProgramScheduleItemFlood
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = null
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var sortedScheduleItems = new List<ProgramScheduleItem>
+            {
+                scheduleItem,
+                NextScheduleItem
+            };
+
+            var scheduler = new PlayoutModeSchedulerFlood(sortedScheduleItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.TailFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 57, 0)));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(6);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[3].GuideGroup.Should().Be(3);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[4].MediaItemId.Should().Be(4);
+            playoutItems[4].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 49, 0)));
+            playoutItems[4].GuideGroup.Should().Be(3);
+            playoutItems[4].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[5].MediaItemId.Should().Be(3);
+            playoutItems[5].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 53, 0)));
+            playoutItems[5].GuideGroup.Should().Be(3);
+            playoutItems[5].FillerKind.Should().Be(FillerKind.Tail);
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_With_Tail_And_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(4));
+            Collection collectionThree = TwoItemCollection(5, 6, TimeSpan.FromMinutes(1));
+
+            var scheduleItem = new ProgramScheduleItemFlood
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Fallback,
+                    Collection = collectionThree,
+                    CollectionId = collectionThree.Id
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator3 = new ChronologicalMediaCollectionEnumerator(
+                collectionThree.MediaItems,
+                new CollectionEnumeratorState());
+
+            var sortedScheduleItems = new List<ProgramScheduleItem>
+            {
+                scheduleItem,
+                NextScheduleItem
+            };
+
+            var scheduler = new PlayoutModeSchedulerFlood(sortedScheduleItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(
+                    scheduleItem,
+                    enumerator1,
+                    scheduleItem.TailFiller,
+                    enumerator2,
+                    scheduleItem.FallbackFiller,
+                    enumerator3),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+            enumerator3.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(7);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[3].GuideGroup.Should().Be(3);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[4].MediaItemId.Should().Be(4);
+            playoutItems[4].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 49, 0)));
+            playoutItems[4].GuideGroup.Should().Be(3);
+            playoutItems[4].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[5].MediaItemId.Should().Be(3);
+            playoutItems[5].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 53, 0)));
+            playoutItems[5].GuideGroup.Should().Be(3);
+            playoutItems[5].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[6].MediaItemId.Should().Be(5);
+            playoutItems[6].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 57, 0)));
+            playoutItems[6].GuideGroup.Should().Be(3);
+            playoutItems[6].FillerKind.Should().Be(FillerKind.Fallback);
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_With_Unused_Tail_And_Unused_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromHours(1));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(4));
+            Collection collectionThree = TwoItemCollection(5, 6, TimeSpan.FromMinutes(1));
+
+            var scheduleItem = new ProgramScheduleItemFlood
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Fallback,
+                    Collection = collectionThree,
+                    CollectionId = collectionThree.Id
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator3 = new ChronologicalMediaCollectionEnumerator(
+                collectionThree.MediaItems,
+                new CollectionEnumeratorState());
+
+            var sortedScheduleItems = new List<ProgramScheduleItem>
+            {
+                scheduleItem,
+                NextScheduleItem
+            };
+
+            var scheduler = new PlayoutModeSchedulerFlood(sortedScheduleItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(
+                    scheduleItem,
+                    enumerator1,
+                    scheduleItem.TailFiller,
+                    enumerator2,
+                    scheduleItem.FallbackFiller,
+                    enumerator3),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(0);
+            enumerator3.State.Index.Should().Be(0);
+
+            playoutItems.Count.Should().Be(3);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddHours(1));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.AddHours(2));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+        }
+
+        protected override ProgramScheduleItem NextScheduleItem => new ProgramScheduleItemOne
+        {
+            StartTime = TimeSpan.FromHours(3)
+        };
+    }
+}

ErsatzTV.Core.Tests/Scheduling/PlayoutModeSchedulerMultipleTests.cs

@@ -0,0 +1,630 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
+using ErsatzTV.Core.Scheduling;
+using FluentAssertions;
+using LanguageExt;
+using Microsoft.Extensions.Logging;
+using Moq;
+using NUnit.Framework;
+
+namespace ErsatzTV.Core.Tests.Scheduling
+{
+    [TestFixture]
+    public class PlayoutModeSchedulerMultipleTests : SchedulerTestBase
+    {
+        [Test]
+        public void Should_Fill_Exactly_To_Next_Schedule_Item()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromHours(1));
+
+            var scheduleItem = new ProgramScheduleItemMultiple
+            {
+                Id = 1,
+                Index = 1,
+                CollectionType = ProgramScheduleItemCollectionType.Collection,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = null,
+                FallbackFiller = null,
+                Count = 3
+            };
+
+            var enumerator = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var collectionMediaItems = new Dictionary<CollectionKey, List<MediaItem>>
+            {
+                { CollectionKey.ForScheduleItem(scheduleItem), collectionOne.MediaItems }
+            }.ToMap();
+    
+            var scheduler = new PlayoutModeSchedulerMultiple(collectionMediaItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(3);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddHours(1));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.AddHours(2));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+        }
+
+        [Test]
+        public void Should_Have_Gap_With_No_Tail_No_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+
+            var scheduleItem = new ProgramScheduleItemMultiple
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = null,
+                FallbackFiller = null,
+                Count = 3
+            };
+
+            var enumerator = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var collectionMediaItems = new Dictionary<CollectionKey, List<MediaItem>>
+            {
+                { CollectionKey.ForScheduleItem(scheduleItem), collectionOne.MediaItems }
+            }.ToMap();
+
+            var scheduler = new PlayoutModeSchedulerMultiple(collectionMediaItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(3);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_With_Exact_Tail()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(5));
+
+            var scheduleItem = new ProgramScheduleItemMultiple
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = null,
+                Count = 3
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var collectionMediaItems = new Dictionary<CollectionKey, List<MediaItem>>
+            {
+                { CollectionKey.ForScheduleItem(scheduleItem), collectionOne.MediaItems },
+                { CollectionKey.ForFillerPreset(scheduleItem.TailFiller), collectionTwo.MediaItems }
+            }.ToMap();
+
+            var scheduler = new PlayoutModeSchedulerMultiple(collectionMediaItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.TailFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(6);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[3].GuideGroup.Should().Be(3);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[4].MediaItemId.Should().Be(4);
+            playoutItems[4].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 50, 0)));
+            playoutItems[4].GuideGroup.Should().Be(3);
+            playoutItems[4].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[5].MediaItemId.Should().Be(3);
+            playoutItems[5].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 55, 0)));
+            playoutItems[5].GuideGroup.Should().Be(3);
+            playoutItems[5].FillerKind.Should().Be(FillerKind.Tail);
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_With_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(5));
+
+            var scheduleItem = new ProgramScheduleItemMultiple
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = null,
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                Count = 3
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var collectionMediaItems = new Dictionary<CollectionKey, List<MediaItem>>
+            {
+                { CollectionKey.ForScheduleItem(scheduleItem), collectionOne.MediaItems },
+                { CollectionKey.ForFillerPreset(scheduleItem.FallbackFiller), collectionTwo.MediaItems }
+            }.ToMap();
+
+            var scheduler = new PlayoutModeSchedulerMultiple(collectionMediaItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.FallbackFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(4);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[3].GuideGroup.Should().Be(3);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Fallback);
+        }
+        
+        [Test]
+        public void Should_Have_Gap_With_Tail_No_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(4));
+
+            var scheduleItem = new ProgramScheduleItemMultiple
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = null,
+                Count = 3
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var collectionMediaItems = new Dictionary<CollectionKey, List<MediaItem>>
+            {
+                { CollectionKey.ForScheduleItem(scheduleItem), collectionOne.MediaItems },
+                { CollectionKey.ForFillerPreset(scheduleItem.TailFiller), collectionTwo.MediaItems }
+            }.ToMap();
+
+            var scheduler = new PlayoutModeSchedulerMultiple(collectionMediaItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.TailFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 57, 0)));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(6);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+            
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[3].GuideGroup.Should().Be(3);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[4].MediaItemId.Should().Be(4);
+            playoutItems[4].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 49, 0)));
+            playoutItems[4].GuideGroup.Should().Be(3);
+            playoutItems[4].FillerKind.Should().Be(FillerKind.Tail);
+        
+            playoutItems[5].MediaItemId.Should().Be(3);
+            playoutItems[5].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 53, 0)));
+            playoutItems[5].GuideGroup.Should().Be(3);
+            playoutItems[5].FillerKind.Should().Be(FillerKind.Tail);
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_With_Tail_And_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromMinutes(55));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(4));
+            Collection collectionThree = TwoItemCollection(5, 6, TimeSpan.FromMinutes(1));
+
+            var scheduleItem = new ProgramScheduleItemMultiple
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Fallback,
+                    Collection = collectionThree,
+                    CollectionId = collectionThree.Id
+                },
+                Count = 3
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator3 = new ChronologicalMediaCollectionEnumerator(
+                collectionThree.MediaItems,
+                new CollectionEnumeratorState());
+
+            var collectionMediaItems = new Dictionary<CollectionKey, List<MediaItem>>
+            {
+                { CollectionKey.ForScheduleItem(scheduleItem), collectionOne.MediaItems },
+                { CollectionKey.ForFillerPreset(scheduleItem.TailFiller), collectionTwo.MediaItems },
+                { CollectionKey.ForFillerPreset(scheduleItem.FallbackFiller), collectionThree.MediaItems }
+            }.ToMap();
+
+            var scheduler = new PlayoutModeSchedulerMultiple(collectionMediaItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(
+                    scheduleItem,
+                    enumerator1,
+                    scheduleItem.TailFiller,
+                    enumerator2,
+                    scheduleItem.FallbackFiller,
+                    enumerator3),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+            enumerator3.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(7);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddMinutes(55));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+        
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(1, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+            
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[3].GuideGroup.Should().Be(3);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[4].MediaItemId.Should().Be(4);
+            playoutItems[4].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 49, 0)));
+            playoutItems[4].GuideGroup.Should().Be(3);
+            playoutItems[4].FillerKind.Should().Be(FillerKind.Tail);
+        
+            playoutItems[5].MediaItemId.Should().Be(3);
+            playoutItems[5].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 53, 0)));
+            playoutItems[5].GuideGroup.Should().Be(3);
+            playoutItems[5].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[6].MediaItemId.Should().Be(5);
+            playoutItems[6].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 57, 0)));
+            playoutItems[6].GuideGroup.Should().Be(3);
+            playoutItems[6].FillerKind.Should().Be(FillerKind.Fallback);
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_With_Unused_Tail_And_Unused_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromHours(1));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(4));
+            Collection collectionThree = TwoItemCollection(5, 6, TimeSpan.FromMinutes(1));
+
+            var scheduleItem = new ProgramScheduleItemMultiple
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Fallback,
+                    Collection = collectionThree,
+                    CollectionId = collectionThree.Id
+                },
+                Count = 3
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator3 = new ChronologicalMediaCollectionEnumerator(
+                collectionThree.MediaItems,
+                new CollectionEnumeratorState());
+
+            var collectionMediaItems = new Dictionary<CollectionKey, List<MediaItem>>
+            {
+                { CollectionKey.ForScheduleItem(scheduleItem), collectionOne.MediaItems },
+                { CollectionKey.ForFillerPreset(scheduleItem.TailFiller), collectionTwo.MediaItems },
+                { CollectionKey.ForFillerPreset(scheduleItem.FallbackFiller), collectionThree.MediaItems }
+            }.ToMap();
+
+            var scheduler = new PlayoutModeSchedulerMultiple(collectionMediaItems, new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(
+                    scheduleItem,
+                    enumerator1,
+                    scheduleItem.TailFiller,
+                    enumerator2,
+                    scheduleItem.FallbackFiller,
+                    enumerator3),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(4);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(0);
+            enumerator3.State.Index.Should().Be(0);
+
+            playoutItems.Count.Should().Be(3);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(2);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddHours(1));
+            playoutItems[1].GuideGroup.Should().Be(2);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.None);
+        
+            playoutItems[2].MediaItemId.Should().Be(1);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.AddHours(2));
+            playoutItems[2].GuideGroup.Should().Be(3);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.None);
+        }
+
+        protected override ProgramScheduleItem NextScheduleItem => new ProgramScheduleItemOne
+        {
+            StartTime = TimeSpan.FromHours(3)
+        };
+    }
+}

ErsatzTV.Core.Tests/Scheduling/PlayoutModeSchedulerOneTests.cs

@@ -0,0 +1,706 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
+using ErsatzTV.Core.Scheduling;
+using FluentAssertions;
+using Microsoft.Extensions.Logging;
+using Moq;
+using NUnit.Framework;
+
+namespace ErsatzTV.Core.Tests.Scheduling
+{
+    [TestFixture]
+    public class PlayoutModeSchedulerOneTests : SchedulerTestBase
+    {
+        [Test]
+        public void Should_Have_Gap_With_No_Tail_No_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromHours(1));
+
+            var scheduleItem = new ProgramScheduleItemOne
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = null,
+                FallbackFiller = null
+            };
+
+            var enumerator = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var scheduler = new PlayoutModeSchedulerOne(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(1));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(2);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(1);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+        }
+
+        [Test]
+        public void Should_Have_Gap_With_Empty_Tail_Empty_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromHours(1));
+            var collectionTwo = new Collection { Id = 2, Name = "Collection 2", MediaItems = new List<MediaItem>() };
+            var collectionThree = new Collection { Id = 3, Name = "Collection 3", MediaItems = new List<MediaItem>() };
+
+            var scheduleItem = new ProgramScheduleItemOne
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    CollectionId = collectionTwo.Id,
+                    Collection = collectionTwo
+                },
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Fallback,
+                    CollectionId = collectionThree.Id,
+                    Collection = collectionThree
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator3 = new ChronologicalMediaCollectionEnumerator(
+                collectionThree.MediaItems,
+                new CollectionEnumeratorState());
+            
+            var scheduler = new PlayoutModeSchedulerOne(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.TailFiller, enumerator2, scheduleItem.FallbackFiller, enumerator3),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(1));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(2);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(0);
+            enumerator3.State.Index.Should().Be(0);
+
+            playoutItems.Count.Should().Be(1);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_With_Exact_Tail()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, new TimeSpan(2, 45, 0));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(5));
+
+            var scheduleItem = new ProgramScheduleItemOne
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = null
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var scheduler = new PlayoutModeSchedulerOne(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.TailFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(2);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(4);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(3);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[1].GuideGroup.Should().Be(1);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[2].MediaItemId.Should().Be(4);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(1);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.Tail);
+        
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 55, 0)));
+            playoutItems[3].GuideGroup.Should().Be(1);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Tail);
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_With_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromHours(1));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(5));
+
+            var scheduleItem = new ProgramScheduleItemOne
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = null,
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var scheduler = new PlayoutModeSchedulerOne(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.FallbackFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(2);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(2);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(3);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.AddHours(1));
+            playoutItems[1].GuideGroup.Should().Be(1);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.Fallback);
+        }
+        
+        [Test]
+        public void Should_Have_Gap_With_Tail_No_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, new TimeSpan(2, 45, 0));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(4));
+
+            var scheduleItem = new ProgramScheduleItemOne
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = null
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var scheduler = new PlayoutModeSchedulerOne(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.TailFiller, enumerator2),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 57, 0)));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(2);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(4);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(3);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[1].GuideGroup.Should().Be(1);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[2].MediaItemId.Should().Be(4);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 49, 0)));
+            playoutItems[2].GuideGroup.Should().Be(1);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.Tail);
+        
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 53, 0)));
+            playoutItems[3].GuideGroup.Should().Be(1);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Tail);
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_With_Tail_And_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, new TimeSpan(2, 45, 0));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(4));
+            Collection collectionThree = TwoItemCollection(5, 6, TimeSpan.FromMinutes(1));
+
+            var scheduleItem = new ProgramScheduleItemOne
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Fallback,
+                    Collection = collectionThree,
+                    CollectionId = collectionThree.Id
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator3 = new ChronologicalMediaCollectionEnumerator(
+                collectionThree.MediaItems,
+                new CollectionEnumeratorState());
+
+            var scheduler = new PlayoutModeSchedulerOne(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(
+                    scheduleItem,
+                    enumerator1,
+                    scheduleItem.TailFiller,
+                    enumerator2,
+                    scheduleItem.FallbackFiller,
+                    enumerator3),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(2);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+            enumerator3.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(5);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(3);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[1].GuideGroup.Should().Be(1);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[2].MediaItemId.Should().Be(4);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 49, 0)));
+            playoutItems[2].GuideGroup.Should().Be(1);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.Tail);
+        
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 53, 0)));
+            playoutItems[3].GuideGroup.Should().Be(1);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.Tail);
+
+            playoutItems[4].MediaItemId.Should().Be(5);
+            playoutItems[4].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 57, 0)));
+            playoutItems[4].GuideGroup.Should().Be(1);
+            playoutItems[4].FillerKind.Should().Be(FillerKind.Fallback);
+        }
+
+        [Test]
+        public void Should_Not_Have_Gap_With_Unused_Tail_And_Unused_Fallback()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, TimeSpan.FromHours(3));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(4));
+            Collection collectionThree = TwoItemCollection(5, 6, TimeSpan.FromMinutes(1));
+
+            var scheduleItem = new ProgramScheduleItemOne
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                TailFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Tail,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Fallback,
+                    Collection = collectionThree,
+                    CollectionId = collectionThree.Id
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator3 = new ChronologicalMediaCollectionEnumerator(
+                collectionThree.MediaItems,
+                new CollectionEnumeratorState());
+
+            var scheduler = new PlayoutModeSchedulerOne(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(
+                    scheduleItem,
+                    enumerator1,
+                    scheduleItem.TailFiller,
+                    enumerator2,
+                    scheduleItem.FallbackFiller,
+                    enumerator3),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(2);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(0);
+            enumerator3.State.Index.Should().Be(0);
+
+            playoutItems.Count.Should().Be(1);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+        }
+
+        [Test]
+        public void Should_Have_No_Gap_With_Exact_Post_Roll_Pad()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, new TimeSpan(2, 45, 0));
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(5));
+            Collection collectionThree = TwoItemCollection(5, 6, TimeSpan.FromMinutes(1));
+
+            var scheduleItem = new ProgramScheduleItemOne
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                PostRollFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.PostRoll,
+                    FillerMode = FillerMode.Pad,
+                    PadToNearestMinute = 30,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Fallback,
+                    Collection = collectionThree,
+                    CollectionId = collectionThree.Id
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator3 = new ChronologicalMediaCollectionEnumerator(
+                collectionThree.MediaItems,
+                new CollectionEnumeratorState());
+
+            var scheduler = new PlayoutModeSchedulerOne(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.PostRollFiller, enumerator2, scheduleItem.FallbackFiller, enumerator3),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(2);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+
+            playoutItems.Count.Should().Be(4);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(3);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[1].GuideGroup.Should().Be(1);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.PostRoll);
+
+            playoutItems[2].MediaItemId.Should().Be(4);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(1);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.PostRoll);
+        
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 55, 0)));
+            playoutItems[3].GuideGroup.Should().Be(1);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.PostRoll);
+        }
+
+        [Test]
+        public void Should_Have_No_Gap_With_Exact_Post_Roll_Pad_With_Chapters()
+        {
+            Collection collectionOne = TwoItemCollection(1, 2, new TimeSpan(2, 45, 0), 2);
+            Collection collectionTwo = TwoItemCollection(3, 4, TimeSpan.FromMinutes(5));
+            Collection collectionThree = TwoItemCollection(5, 6, TimeSpan.FromMinutes(1));
+
+            var scheduleItem = new ProgramScheduleItemOne
+            {
+                Id = 1,
+                Index = 1,
+                Collection = collectionOne,
+                CollectionId = collectionOne.Id,
+                StartTime = null,
+                PlaybackOrder = PlaybackOrder.Chronological,
+                PostRollFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.PostRoll,
+                    FillerMode = FillerMode.Pad,
+                    PadToNearestMinute = 30,
+                    Collection = collectionTwo,
+                    CollectionId = collectionTwo.Id
+                },
+                FallbackFiller = new FillerPreset
+                {
+                    FillerKind = FillerKind.Fallback,
+                    Collection = collectionThree,
+                    CollectionId = collectionThree.Id
+                }
+            };
+
+            var enumerator1 = new ChronologicalMediaCollectionEnumerator(
+                collectionOne.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator2 = new ChronologicalMediaCollectionEnumerator(
+                collectionTwo.MediaItems,
+                new CollectionEnumeratorState());
+
+            var enumerator3 = new ChronologicalMediaCollectionEnumerator(
+                collectionThree.MediaItems,
+                new CollectionEnumeratorState());
+
+            var scheduler = new PlayoutModeSchedulerOne(new Mock<ILogger>().Object);
+            (PlayoutBuilderState playoutBuilderState, List<PlayoutItem> playoutItems) = scheduler.Schedule(
+                StartState,
+                CollectionEnumerators(scheduleItem, enumerator1, scheduleItem.PostRollFiller, enumerator2, scheduleItem.FallbackFiller, enumerator3),
+                scheduleItem,
+                NextScheduleItem,
+                HardStop);
+
+            playoutBuilderState.CurrentTime.Should().Be(StartState.CurrentTime.AddHours(3));
+            playoutItems.Last().FinishOffset.Should().Be(playoutBuilderState.CurrentTime);
+
+            playoutBuilderState.NextGuideGroup.Should().Be(2);
+            playoutBuilderState.DurationFinish.IsNone.Should().BeTrue();
+            playoutBuilderState.InFlood.Should().BeFalse();
+            playoutBuilderState.MultipleRemaining.IsNone.Should().BeTrue();
+            playoutBuilderState.InDurationFiller.Should().BeFalse();
+            playoutBuilderState.ScheduleItemIndex.Should().Be(1);
+
+            enumerator1.State.Index.Should().Be(1);
+            enumerator2.State.Index.Should().Be(1);
+            enumerator3.State.Index.Should().Be(0);
+
+            playoutItems.Count.Should().Be(4);
+
+            playoutItems[0].MediaItemId.Should().Be(1);
+            playoutItems[0].StartOffset.Should().Be(StartState.CurrentTime);
+            playoutItems[0].GuideGroup.Should().Be(1);
+            playoutItems[0].FillerKind.Should().Be(FillerKind.None);
+
+            playoutItems[1].MediaItemId.Should().Be(3);
+            playoutItems[1].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 45, 0)));
+            playoutItems[1].GuideGroup.Should().Be(1);
+            playoutItems[1].FillerKind.Should().Be(FillerKind.PostRoll);
+
+            playoutItems[2].MediaItemId.Should().Be(4);
+            playoutItems[2].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 50, 0)));
+            playoutItems[2].GuideGroup.Should().Be(1);
+            playoutItems[2].FillerKind.Should().Be(FillerKind.PostRoll);
+        
+            playoutItems[3].MediaItemId.Should().Be(3);
+            playoutItems[3].StartOffset.Should().Be(StartState.CurrentTime.Add(new TimeSpan(2, 55, 0)));
+            playoutItems[3].GuideGroup.Should().Be(1);
+            playoutItems[3].FillerKind.Should().Be(FillerKind.PostRoll);
+        }
+
+        protected override ProgramScheduleItem NextScheduleItem => new ProgramScheduleItemOne
+        {
+            StartTime = TimeSpan.FromHours(3)
+        };
+    }
+}

ErsatzTV.Core.Tests/Scheduling/SchedulerTestBase.cs

@@ -0,0 +1,92 @@
+using System;
+using System.Collections.Generic;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
+using ErsatzTV.Core.Interfaces.Scheduling;
+using ErsatzTV.Core.Scheduling;
+using LanguageExt;
+
+namespace ErsatzTV.Core.Tests.Scheduling
+{
+    public abstract class SchedulerTestBase
+    {
+        protected static PlayoutBuilderState StartState => new(
+            0,
+            Prelude.None,
+            Prelude.None,
+            false,
+            false,
+            1,
+            new DateTimeOffset(new DateTime(2020, 10, 18, 0, 0, 0, DateTimeKind.Local)));
+
+        protected virtual ProgramScheduleItem NextScheduleItem => new ProgramScheduleItemOne
+        {
+            StartTime = null
+        };
+
+        protected static DateTimeOffset HardStop => StartState.CurrentTime.AddHours(6);
+
+        protected static Dictionary<CollectionKey, IMediaCollectionEnumerator> CollectionEnumerators(
+            ProgramScheduleItem scheduleItem, IMediaCollectionEnumerator enumerator) =>
+            new()
+            {
+                { CollectionKey.ForScheduleItem(scheduleItem), enumerator }
+            };
+
+        protected static Dictionary<CollectionKey, IMediaCollectionEnumerator> CollectionEnumerators(
+            ProgramScheduleItem scheduleItem, IMediaCollectionEnumerator enumerator1,
+            FillerPreset fillerPreset, IMediaCollectionEnumerator enumerator2,
+            FillerPreset fillerPreset2, IMediaCollectionEnumerator enumerator3) =>
+            new()
+            {
+                { CollectionKey.ForScheduleItem(scheduleItem), enumerator1 },
+                { CollectionKey.ForFillerPreset(fillerPreset), enumerator2 },
+                { CollectionKey.ForFillerPreset(fillerPreset2), enumerator3 }
+            };
+
+        private static Movie TestMovie(int id, TimeSpan duration, DateTime aired, int chapterCount = 0)
+        {
+            var result = new Movie()
+            {
+                Id = id,
+                MovieMetadata = new List<MovieMetadata> { new() { ReleaseDate = aired } },
+                MediaVersions = new List<MediaVersion>
+                {
+                    new() { Duration = duration, Chapters = new List<MediaChapter>() }
+                }
+            };
+
+            for (var i = 0; i < chapterCount; i++)
+            {
+                result.MediaVersions.Head().Chapters.Add(
+                    new MediaChapter
+                    {
+                        StartTime = TimeSpan.FromMilliseconds(i * duration.TotalMilliseconds / chapterCount),
+                        EndTime = TimeSpan.FromMilliseconds(i + 1 * duration.TotalMilliseconds / chapterCount)
+                    });
+            }
+
+            return result;
+        }
+
+        protected static Collection TwoItemCollection(int id1, int id2, TimeSpan duration, int chapterCount = 0) => new()
+        {
+            Id = id1,
+            Name = $"Collection of Items {id1}",
+            MediaItems = new List<MediaItem>
+            {
+                TestMovie(id1, duration, new DateTime(2020, 1, 1), chapterCount),
+                TestMovie(id2, duration, new DateTime(2020, 1, 2), chapterCount)
+            }
+        };
+
+        protected static Dictionary<CollectionKey, IMediaCollectionEnumerator> CollectionEnumerators(
+            ProgramScheduleItem scheduleItem, IMediaCollectionEnumerator enumerator1,
+            FillerPreset fillerPreset, IMediaCollectionEnumerator enumerator2) =>
+            new()
+            {
+                { CollectionKey.ForScheduleItem(scheduleItem), enumerator1 },
+                { CollectionKey.ForFillerPreset(fillerPreset), enumerator2 }
+            };
+    }
+}

ErsatzTV.Core/Domain/Channel.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using ErsatzTV.Core.Domain.Filler;
 
 namespace ErsatzTV.Core.Domain
 {
@@ -16,6 +17,8 @@ namespace ErsatzTV.Core.Domain
         public FFmpegProfile FFmpegProfile { get; set; }
         public int? WatermarkId { get; set; }
         public ChannelWatermark Watermark { get; set; }
+        public int? FallbackFillerId { get; set; }
+        public FillerPreset FallbackFiller { get; set; }
         public StreamingMode StreamingMode { get; set; }
         public List<Playout> Playouts { get; set; }
         public List<Artwork> Artwork { get; set; }

ErsatzTV.Core/Domain/ConfigElementKey.cs

@@ -13,6 +13,7 @@
         public static ConfigElementKey FFmpegSaveReports => new("ffmpeg.save_reports");
         public static ConfigElementKey FFmpegPreferredLanguageCode => new("ffmpeg.preferred_language_code");
         public static ConfigElementKey FFmpegGlobalWatermarkId => new("ffmpeg.global_watermark_id");
+        public static ConfigElementKey FFmpegGlobalFallbackFillerId => new("ffmpeg.global_fallback_filler_id");
         public static ConfigElementKey FFmpegSegmenterTimeout => new("ffmpeg.segmenter.timeout_seconds");
         public static ConfigElementKey FFmpegWorkAheadSegmenters => new("ffmpeg.segmenter.work_ahead_limit");
         public static ConfigElementKey SearchIndexVersion => new("search_index.version");
@@ -25,8 +26,10 @@
         public static ConfigElementKey SchedulesDetailPageSize => new("pages.schedules.detail_page_size");
         public static ConfigElementKey PlayoutsPageSize => new("pages.playouts.page_size");
         public static ConfigElementKey PlayoutsDetailPageSize => new("pages.playouts.detail_page_size");
+        public static ConfigElementKey PlayoutsDetailShowFiller => new("pages.playouts.detail_show_filler");
         public static ConfigElementKey LogsPageSize => new("pages.logs.page_size");
         public static ConfigElementKey TraktListsPageSize => new("pages.trakt.lists_page_size");
+        public static ConfigElementKey FillerPresetsPageSize => new("pages.filler_presets.page_size");
         public static ConfigElementKey LibraryRefreshInterval => new("scanner.library_refresh_interval");
         public static ConfigElementKey PlayoutDaysToBuild => new("playout.days_to_build");
     }

ErsatzTV.Core/Domain/Filler/FillerKind.cs

@@ -0,0 +1,12 @@
+namespace ErsatzTV.Core.Domain.Filler
+{
+    public enum FillerKind
+    {
+        None = 0,
+        PreRoll = 1,
+        MidRoll = 2,
+        PostRoll = 3,
+        Tail = 4,
+        Fallback = 5
+    }
+}

ErsatzTV.Core/Domain/Filler/FillerMode.cs

@@ -0,0 +1,10 @@
+namespace ErsatzTV.Core.Domain.Filler
+{
+    public enum FillerMode
+    {
+        None = 0,
+        Duration = 1,
+        Count = 2,
+        Pad = 3
+    }
+}

ErsatzTV.Core/Domain/Filler/FillerPreset.cs

@@ -0,0 +1,24 @@
+using System;
+
+namespace ErsatzTV.Core.Domain.Filler
+{
+    public class FillerPreset
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public FillerKind FillerKind { get; set; }
+        public FillerMode FillerMode { get; set; }
+        public TimeSpan? Duration { get; set; }
+        public int? Count { get; set; }
+        public int? PadToNearestMinute { get; set; }
+        public ProgramScheduleItemCollectionType CollectionType { get; set; }
+        public int? CollectionId { get; set; }
+        public Collection Collection { get; set; }
+        public int? MediaItemId { get; set; }
+        public MediaItem MediaItem { get; set; }
+        public int? MultiCollectionId { get; set; }
+        public MultiCollection MultiCollection { get; set; }
+        public int? SmartCollectionId { get; set; }
+        public SmartCollection SmartCollection { get; set; }
+    }
+}

ErsatzTV.Core/Domain/MediaItem/MediaChapter.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace ErsatzTV.Core.Domain
+{
+    public class MediaChapter
+    {
+        public int Id { get; set; }
+        public int MediaVersionId { get; set; }
+        public MediaVersion MediaVersion { get; set; }
+        public long ChapterId { get; set; }
+        public TimeSpan StartTime { get; set; }
+        public TimeSpan EndTime { get; set; }
+        public string Title { get; set; }
+    }
+}

ErsatzTV.Core/Domain/MediaItem/MediaVersion.cs

@@ -10,6 +10,7 @@ namespace ErsatzTV.Core.Domain
         public string Name { get; set; }
         public List<MediaFile> MediaFiles { get; set; }
         public List<MediaStream> Streams { get; set; }
+        public List<MediaChapter> Chapters { get; set; }
         public TimeSpan Duration { get; set; }
         public string SampleAspectRatio { get; set; }
         public string DisplayAspectRatio { get; set; }

ErsatzTV.Core/Domain/PlayoutAnchor.cs

@@ -15,6 +15,7 @@ namespace ErsatzTV.Core.Domain
         public DateTime? DurationFinish { get; set; }
         public bool InFlood { get; set; }
         public bool InDurationFiller { get; set; }
+        public int NextGuideGroup { get; set; }
 
         public DateTimeOffset NextStartOffset => new DateTimeOffset(NextStart, TimeSpan.Zero).ToLocalTime();
 

ErsatzTV.Core/Domain/PlayoutItem.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Diagnostics;
+using ErsatzTV.Core.Domain.Filler;
 
 namespace ErsatzTV.Core.Domain
 {
@@ -13,15 +14,36 @@ namespace ErsatzTV.Core.Domain
         public DateTime Finish { get; set; }
         public DateTime? GuideFinish { get; set; }
         public string CustomTitle { get; set; }
-        public bool CustomGroup { get; set; }
-        public bool IsFiller { get; set; }
+        public int GuideGroup { get; set; }
+        public FillerKind FillerKind { get; set; }
         public int PlayoutId { get; set; }
         public Playout Playout { get; set; }
+        public TimeSpan InPoint { get; set; }
+        public TimeSpan OutPoint { get; set; }
+        public string ChapterTitle { get; set; }
 
         public DateTimeOffset StartOffset => new DateTimeOffset(Start, TimeSpan.Zero).ToLocalTime();
         public DateTimeOffset FinishOffset => new DateTimeOffset(Finish, TimeSpan.Zero).ToLocalTime();
         public DateTimeOffset? GuideFinishOffset => GuideFinish.HasValue
             ? new DateTimeOffset(GuideFinish.Value, TimeSpan.Zero).ToLocalTime()
             : null;
+
+        public PlayoutItem ForChapter(MediaChapter chapter) =>
+            new()
+            {
+                MediaItemId = MediaItemId,
+                MediaItem = MediaItem,
+                Start = Start,
+                Finish = Start + chapter.EndTime - chapter.StartTime,
+                GuideFinish = GuideFinish,
+                CustomTitle = CustomTitle,
+                GuideGroup = GuideGroup,
+                FillerKind = FillerKind,
+                PlayoutId = PlayoutId,
+                Playout = Playout,
+                InPoint = chapter.StartTime,
+                OutPoint = chapter.EndTime,
+                ChapterTitle = chapter.Title
+            };
     }
 }

ErsatzTV.Core/Domain/ProgramScheduleItem.cs

@@ -1,4 +1,5 @@
 using System;
+using ErsatzTV.Core.Domain.Filler;
 
 namespace ErsatzTV.Core.Domain
 {
@@ -22,5 +23,15 @@ namespace ErsatzTV.Core.Domain
         public int? SmartCollectionId { get; set; }
         public SmartCollection SmartCollection { get; set; }
         public PlaybackOrder PlaybackOrder { get; set; }
+        public int? PreRollFillerId { get; set; }
+        public FillerPreset PreRollFiller { get; set; }
+        public int? MidRollFillerId { get; set; }
+        public FillerPreset MidRollFiller { get; set; }
+        public int? PostRollFillerId { get; set; }
+        public FillerPreset PostRollFiller { get; set; }
+        public int? TailFillerId { get; set; }
+        public FillerPreset TailFiller { get; set; }
+        public int? FallbackFillerId { get; set; }
+        public FillerPreset FallbackFiller { get; set; }
     }
 }

ErsatzTV.Core/Domain/ProgramScheduleItemDuration.cs

@@ -6,14 +6,5 @@ namespace ErsatzTV.Core.Domain
     {
         public TimeSpan PlayoutDuration { get; set; }
         public TailMode TailMode { get; set; }
-        public ProgramScheduleItemCollectionType TailCollectionType { get; set; }
-        public int? TailCollectionId { get; set; }
-        public Collection TailCollection { get; set; }
-        public int? TailMediaItemId { get; set; }
-        public MediaItem TailMediaItem { get; set; }
-        public int? TailMultiCollectionId { get; set; }
-        public MultiCollection TailMultiCollection { get; set; }
-        public int? TailSmartCollectionId { get; set; }
-        public SmartCollection TailSmartCollection { get; set; }
     }
 }

ErsatzTV.Core/Emby/EmbyPathReplacementService.cs

@@ -68,7 +68,7 @@ namespace ErsatzTV.Core.Emby
 
                     if (log)
                     {
-                        _logger.LogDebug(
+                        _logger.LogInformation(
                             "Replacing emby path {EmbyPath} with {LocalPath} resulting in {FinalPath}",
                             replacement.EmbyPath,
                             replacement.LocalPath,

ErsatzTV.Core/ErsatzTV.Core.csproj

@@ -8,7 +8,7 @@
 
     <ItemGroup>
       <PackageReference Include="Flurl" Version="3.0.2" />
-      <PackageReference Include="LanguageExt.Core" Version="3.4.15" />
+      <PackageReference Include="LanguageExt.Core" Version="4.0.3" />
       <PackageReference Include="MediatR" Version="9.0.0" />
       <PackageReference Include="Microsoft.Extensions.Http" Version="5.0.0" />
       <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="5.0.0" />

ErsatzTV.Core/FFmpeg/FFmpegPlaybackSettingsCalculator.cs

@@ -49,7 +49,9 @@ namespace ErsatzTV.Core.FFmpeg
             MediaStream videoStream,
             Option<MediaStream> audioStream,
             DateTimeOffset start,
-            DateTimeOffset now)
+            DateTimeOffset now,
+            TimeSpan inPoint,
+            TimeSpan outPoint)
         {
             var result = new FFmpegPlaybackSettings
             {
@@ -57,9 +59,9 @@ namespace ErsatzTV.Core.FFmpeg
                 FormatFlags = CommonFormatFlags
             };
 
-            if (now != start)
+            if (now != start || inPoint != TimeSpan.Zero)
             {
-                result.StreamSeek = now - start;
+                result.StreamSeek = now - start + inPoint;
             }
 
             switch (streamingMode)
@@ -140,7 +142,7 @@ namespace ErsatzTV.Core.FFmpeg
                             });
 
                         result.AudioSampleRate = ffmpegProfile.AudioSampleRate;
-                        result.AudioDuration = version.Duration;
+                        result.AudioDuration = outPoint - inPoint;
                         result.NormalizeLoudness = ffmpegProfile.NormalizeLoudness;
                     }
                     else

ErsatzTV.Core/FFmpeg/FFmpegProcessBuilder.cs

@@ -141,10 +141,14 @@ namespace ErsatzTV.Core.FFmpeg
             return this;
         }
 
-        public FFmpegProcessBuilder WithInfiniteLoop()
+        public FFmpegProcessBuilder WithInfiniteLoop(bool loop = true)
         {
-            _arguments.Add("-stream_loop");
-            _arguments.Add("-1");
+            if (loop)
+            {
+                _arguments.Add("-stream_loop");
+                _arguments.Add("-1");
+            }
+
             return this;
         }
 
@@ -375,7 +379,8 @@ namespace ErsatzTV.Core.FFmpeg
             {
                 "-c:v", playbackSettings.VideoCodec,
                 "-flags", "cgop",
-                "-sc_threshold", "0" // disable scene change detection
+                // disable scene change detection except with mpeg2video
+                "-sc_threshold", playbackSettings.VideoCodec == "mpeg2video" ? "1000000000" : "0"
             };
 
             if (!string.IsNullOrWhiteSpace(_outputPixelFormat))

ErsatzTV.Core/FFmpeg/FFmpegProcessService.cs

@@ -3,6 +3,7 @@ using System.Diagnostics;
 using System.IO;
 using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
 using ErsatzTV.Core.Interfaces.FFmpeg;
 using ErsatzTV.Core.Interfaces.Images;
 using LanguageExt;
@@ -37,11 +38,15 @@ namespace ErsatzTV.Core.FFmpeg
             MediaVersion version,
             string path,
             DateTimeOffset start,
+            DateTimeOffset finish,
             DateTimeOffset now,
             Option<ChannelWatermark> globalWatermark,
             VaapiDriver vaapiDriver,
             string vaapiDevice,
-            bool hlsRealtime)
+            bool hlsRealtime,
+            FillerKind fillerKind,
+            TimeSpan inPoint,
+            TimeSpan outPoint)
         {
             MediaStream videoStream = await _ffmpegStreamSelector.SelectVideoStream(channel, version);
             Option<MediaStream> maybeAudioStream = await _ffmpegStreamSelector.SelectAudioStream(channel, version);
@@ -53,7 +58,9 @@ namespace ErsatzTV.Core.FFmpeg
                 videoStream,
                 maybeAudioStream,
                 start,
-                now);
+                now,
+                inPoint,
+                outPoint);
 
             (Option<ChannelWatermark> maybeWatermark, Option<string> maybeWatermarkPath) =
                 GetWatermarkOptions(channel, globalWatermark);
@@ -70,6 +77,7 @@ namespace ErsatzTV.Core.FFmpeg
                 .WithFormatFlags(playbackSettings.FormatFlags)
                 .WithRealtimeOutput(playbackSettings.RealtimeOutput)
                 .WithSeek(playbackSettings.StreamSeek)
+                .WithInfiniteLoop(fillerKind == FillerKind.Fallback)
                 .WithInputCodec(path, playbackSettings.VideoDecoder, videoStream.Codec, videoStream.PixelFormat)
                 .WithWatermark(maybeWatermark, maybeWatermarkPath, channel.FFmpegProfile.Resolution, isAnimated)
                 .WithVideoTrackTimeScale(playbackSettings.VideoTrackTimeScale)
@@ -114,7 +122,7 @@ namespace ErsatzTV.Core.FFmpeg
 
             builder = builder.WithPlaybackArgs(playbackSettings)
                 .WithMetadata(channel, maybeAudioStream)
-                .WithDuration(start + version.Duration - now);
+                .WithDuration(finish - now);
 
             switch (channel.StreamingMode)
             {

ErsatzTV.Core/Interfaces/Scheduling/IMediaCollectionEnumerator.cs

@@ -8,5 +8,6 @@ namespace ErsatzTV.Core.Interfaces.Scheduling
         CollectionEnumeratorState State { get; }
         Option<MediaItem> Current { get; }
         void MoveNext();
+        Option<MediaItem> Peek(int offset);
     }
 }

ErsatzTV.Core/Interfaces/Scheduling/IPlayoutModeScheduler.cs

@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Scheduling;
+
+namespace ErsatzTV.Core.Interfaces.Scheduling
+{
+    public interface IPlayoutModeScheduler<in T> where T : ProgramScheduleItem
+    {
+        Tuple<PlayoutBuilderState, List<PlayoutItem>> Schedule(
+            PlayoutBuilderState playoutBuilderState,
+            Dictionary<CollectionKey, IMediaCollectionEnumerator> collectionEnumerators,
+            T scheduleItem,
+            ProgramScheduleItem nextScheduleItem,
+            DateTimeOffset hardStop);
+    }
+}

ErsatzTV.Core/Iptv/ChannelGuide.cs

@@ -5,6 +5,7 @@ using System.Linq;
 using System.Text;
 using System.Xml;
 using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
 using ErsatzTV.Core.Emby;
 using ErsatzTV.Core.Jellyfin;
 using LanguageExt;
@@ -70,7 +71,7 @@ namespace ErsatzTV.Core.Iptv
             foreach ((Channel channel, List<PlayoutItem> sorted) in sortedChannelItems.OrderBy(kvp => kvp.Key.Number))
             {
                 var i = 0;
-                while (i < sorted.Count && sorted[i].IsFiller)
+                while (i < sorted.Count && sorted[i].FillerKind != FillerKind.None && sorted[i].FillerKind != FillerKind.PreRoll)
                 {
                     i++;
                 }
@@ -78,23 +79,28 @@ namespace ErsatzTV.Core.Iptv
                 while (i < sorted.Count)
                 {
                     PlayoutItem startItem = sorted[i];
+                    int j = i;
+                    while (j + 1 < sorted.Count && sorted[j].FillerKind != FillerKind.None)
+                    {
+                        j++;
+                    }
+                    PlayoutItem displayItem = sorted[j];
                     bool hasCustomTitle = !string.IsNullOrWhiteSpace(startItem.CustomTitle);
 
                     int finishIndex = i;
-                    while (finishIndex + 1 < sorted.Count && (hasCustomTitle && sorted[finishIndex + 1].CustomGroup ||
-                                                              sorted[finishIndex + 1].IsFiller))
+                    while (finishIndex + 1 < sorted.Count && sorted[finishIndex + 1].GuideGroup == startItem.GuideGroup)
                     {
                         finishIndex++;
                     }
 
                     int customShowId = -1;
-                    if (sorted[i].MediaItem is Episode ep)
+                    if (displayItem.MediaItem is Episode ep)
                     {
                         customShowId = ep.Season.ShowId;
                     }
 
                     bool isSameCustomShow = hasCustomTitle;
-                    for (int x = i; x <= finishIndex; x++)
+                    for (int x = j; x <= finishIndex; x++)
                     {
                         isSameCustomShow = isSameCustomShow && sorted[x].MediaItem is Episode e &&
                                            customShowId == e.Season.ShowId;
@@ -104,14 +110,14 @@ namespace ErsatzTV.Core.Iptv
                     i = finishIndex;
 
                     string start = startItem.StartOffset.ToString("yyyyMMddHHmmss zzz").Replace(":", string.Empty);
-                    string stop = startItem.GuideFinishOffset.HasValue
-                        ? startItem.GuideFinishOffset.Value.ToString("yyyyMMddHHmmss zzz").Replace(":", string.Empty)
+                    string stop = displayItem.GuideFinishOffset.HasValue
+                        ? displayItem.GuideFinishOffset.Value.ToString("yyyyMMddHHmmss zzz").Replace(":", string.Empty)
                         : finishItem.FinishOffset.ToString("yyyyMMddHHmmss zzz").Replace(":", string.Empty);
 
-                    string title = GetTitle(startItem);
-                    string subtitle = GetSubtitle(startItem);
-                    string description = GetDescription(startItem);
-                    Option<ContentRating> contentRating = GetContentRating(startItem);
+                    string title = GetTitle(displayItem);
+                    string subtitle = GetSubtitle(displayItem);
+                    string description = GetDescription(displayItem);
+                    Option<ContentRating> contentRating = GetContentRating(displayItem);
 
                     xml.WriteStartElement("programme");
                     xml.WriteAttributeString("start", start);
@@ -142,7 +148,7 @@ namespace ErsatzTV.Core.Iptv
                         }
                     }
 
-                    if (!hasCustomTitle && startItem.MediaItem is Movie movie)
+                    if (!hasCustomTitle && displayItem.MediaItem is Movie movie)
                     {
                         foreach (MovieMetadata metadata in movie.MovieMetadata.HeadOrNone())
                         {
@@ -175,7 +181,7 @@ namespace ErsatzTV.Core.Iptv
                         }
                     }
 
-                    if (!hasCustomTitle && startItem.MediaItem is MusicVideo musicVideo)
+                    if (!hasCustomTitle && displayItem.MediaItem is MusicVideo musicVideo)
                     {
                         foreach (MusicVideoMetadata metadata in musicVideo.MusicVideoMetadata.HeadOrNone())
                         {
@@ -208,7 +214,7 @@ namespace ErsatzTV.Core.Iptv
                         }
                     }
 
-                    if (startItem.MediaItem is Episode episode && (!hasCustomTitle || isSameCustomShow))
+                    if (displayItem.MediaItem is Episode episode && (!hasCustomTitle || isSameCustomShow))
                     {
                         Option<ShowMetadata> maybeMetadata =
                             Optional(episode.Season?.Show?.ShowMetadata.HeadOrNone()).Flatten();

ErsatzTV.Core/Jellyfin/JellyfinPathReplacementService.cs

@@ -69,7 +69,7 @@ namespace ErsatzTV.Core.Jellyfin
 
                     if (log)
                     {
-                        _logger.LogDebug(
+                        _logger.LogInformation(
                             "Replacing jellyfin path {JellyfinPath} with {LocalPath} resulting in {FinalPath}",
                             replacement.JellyfinPath,
                             replacement.LocalPath,

ErsatzTV.Core/Metadata/FolderEtag.cs

@@ -31,5 +31,32 @@ namespace ErsatzTV.Core.Metadata
 
             return hash.ToString();
         }
+        
+        public static string CalculateWithSubfolders(string folder, ILocalFileSystem localFileSystem)
+        {
+            IEnumerable<string> allFiles = localFileSystem.ListFiles(folder);
+
+            var sb = new StringBuilder();
+            foreach (string file in allFiles.OrderBy(identity))
+            {
+                sb.Append(file);
+                sb.Append(localFileSystem.GetLastWriteTime(file).Ticks);
+            }
+
+            foreach (string subfolder in localFileSystem.ListSubdirectories(folder).OrderBy(identity))
+            {
+                sb.Append(subfolder);
+                sb.Append(Calculate(subfolder, localFileSystem));
+            }
+
+            var hash = new StringBuilder();
+            byte[] bytes = Crypto.ComputeHash(Encoding.UTF8.GetBytes(sb.ToString()));
+            foreach (byte t in bytes)
+            {
+                hash.Append(t.ToString("x2"));
+            }
+
+            return hash.ToString();
+        }
     }
 }

ErsatzTV.Core/Metadata/LocalStatisticsProvider.cs

@@ -110,6 +110,7 @@ namespace ErsatzTV.Core.Metadata
             startInfo.ArgumentList.Add("json");
             startInfo.ArgumentList.Add("-show_format");
             startInfo.ArgumentList.Add("-show_streams");
+            startInfo.ArgumentList.Add("-show_chapters");
             startInfo.ArgumentList.Add("-i");
             startInfo.ArgumentList.Add(filePath);
 
@@ -138,9 +139,18 @@ namespace ErsatzTV.Core.Metadata
                     json =>
                     {
                         var version = new MediaVersion
-                            { Name = "Main", DateAdded = DateTime.UtcNow, Streams = new List<MediaStream>() };
+                        {
+                            Name = "Main",
+                            DateAdded = DateTime.UtcNow,
+                            Streams = new List<MediaStream>(),
+                            Chapters = new List<MediaChapter>()
+                        };
 
-                        if (double.TryParse(json.format.duration, NumberStyles.Number, CultureInfo.InvariantCulture, out double duration))
+                        if (double.TryParse(
+                            json.format.duration,
+                            NumberStyles.Number,
+                            CultureInfo.InvariantCulture,
+                            out double duration))
                         {
                             var seconds = TimeSpan.FromSeconds(duration);
                             version.Duration = seconds;
@@ -240,10 +250,56 @@ namespace ErsatzTV.Core.Metadata
                             version.Streams.Add(stream);
                         }
 
+                        foreach (FFprobeChapter probedChapter in json.chapters)
+                        {
+                            if (double.TryParse(
+                                    probedChapter.start_time,
+                                    NumberStyles.Number,
+                                    CultureInfo.InvariantCulture,
+                                    out double startTime)
+                                && double.TryParse(
+                                    probedChapter.end_time,
+                                    NumberStyles.Number,
+                                    CultureInfo.InvariantCulture,
+                                    out double endTime))
+                            {
+                                var chapter = new MediaChapter
+                                {
+                                    MediaVersionId = version.Id,
+                                    ChapterId = probedChapter.id,
+                                    StartTime = TimeSpan.FromSeconds(startTime),
+                                    EndTime = TimeSpan.FromSeconds(endTime),
+                                    Title = probedChapter?.tags?.title
+                                };
+
+                                version.Chapters.Add(chapter);
+                            }
+                            else
+                            {
+                                _logger.LogWarning(
+                                    "Media item at {Path} has a missing or invalid chapter start/end time",
+                                    path);
+                            }
+                        }
+
+                        if (version.Chapters.Any())
+                        {
+                            MediaChapter last = version.Chapters.Last();
+                            if (last.EndTime != version.Duration)
+                            {
+                                last.EndTime = version.Duration;
+                            }
+                        }
+
                         return version;
                     },
                     _ => new MediaVersion
-                        { Name = "Main", DateAdded = DateTime.UtcNow, Streams = new List<MediaStream>() });
+                    {
+                        Name = "Main",
+                        DateAdded = DateTime.UtcNow,
+                        Streams = new List<MediaStream>(),
+                        Chapters = new List<MediaChapter>()
+                    });
 
         private VideoScanKind ScanKindFromFieldOrder(string fieldOrder) =>
             fieldOrder?.ToLowerInvariant() switch
@@ -254,13 +310,13 @@ namespace ErsatzTV.Core.Metadata
             };
 
         // ReSharper disable InconsistentNaming
-        public record FFprobe(FFprobeFormat format, List<FFprobeStream> streams);
+        public record FFprobe(FFprobeFormat format, List<FFprobeStream> streams, List<FFprobeChapter> chapters);
 
         public record FFprobeFormat(string duration);
 
         public record FFprobeDisposition(int @default, int forced);
 
-        public record FFProbeTags(string language, string title);
+        public record FFprobeTags(string language, string title);
 
         public record FFprobeStream(
             int index,
@@ -277,7 +333,13 @@ namespace ErsatzTV.Core.Metadata
             string r_frame_rate,
             string bits_per_raw_sample,
             FFprobeDisposition disposition,
-            FFProbeTags tags);
+            FFprobeTags tags);
+
+        public record FFprobeChapter(
+            long id,
+            string start_time,
+            string end_time,
+            FFprobeTags tags);
         // ReSharper restore InconsistentNaming
     }
 }

ErsatzTV.Core/Metadata/OtherVideoFolderScanner.cs

@@ -119,8 +119,6 @@ namespace ErsatzTV.Core.Metadata
 
                 foreach (string file in allFiles.OrderBy(identity))
                 {
-                    _logger.LogDebug("Other video found at {File}", file);
-
                     Either<BaseError, MediaItemScanResult<OtherVideo>> maybeVideo = await _otherVideoRepository
                         .GetOrAdd(libraryPath, file)
                         .BindT(video => UpdateStatistics(video, ffprobePath))

ErsatzTV.Core/Metadata/TelevisionFolderScanner.cs

@@ -159,7 +159,7 @@ namespace ErsatzTV.Core.Metadata
             foreach (string seasonFolder in _localFileSystem.ListSubdirectories(showFolder).Filter(ShouldIncludeFolder)
                 .OrderBy(identity))
             {
-                string etag = FolderEtag.Calculate(seasonFolder, _localFileSystem);
+                string etag = FolderEtag.CalculateWithSubfolders(seasonFolder, _localFileSystem);
                 Option<LibraryFolder> knownFolder = libraryPath.LibraryFolders
                     .Filter(f => f.Path == seasonFolder)
                     .HeadOrNone();
@@ -208,10 +208,16 @@ namespace ErsatzTV.Core.Metadata
             Season season,
             string seasonPath)
         {
-            foreach (string file in _localFileSystem.ListFiles(seasonPath)
+            var allSeasonFiles = _localFileSystem.ListSubdirectories(seasonPath)
+                .Map(_localFileSystem.ListFiles)
+                .Flatten()
+                .Append(_localFileSystem.ListFiles(seasonPath))
                 .Filter(f => VideoFileExtensions.Contains(Path.GetExtension(f)))
                 .Filter(f => !Path.GetFileName(f).StartsWith("._"))
-                .OrderBy(identity))
+                .OrderBy(identity)
+                .ToList();
+
+            foreach (string file in allSeasonFiles)
             {
                 // TODO: figure out how to rebuild playlists
                 Either<BaseError, Episode> maybeEpisode = await _televisionRepository

ErsatzTV.Core/Scheduling/ChronologicalMediaCollectionEnumerator.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Scheduling;
@@ -36,5 +37,8 @@ namespace ErsatzTV.Core.Scheduling
         public Option<MediaItem> Current => _sortedMediaItems.Any() ? _sortedMediaItems[State.Index] : None;
 
         public void MoveNext() => State.Index = (State.Index + 1) % _sortedMediaItems.Count;
+
+        public Option<MediaItem> Peek(int offset) =>
+            _sortedMediaItems.Any() ? _sortedMediaItems[(State.Index + offset) % _sortedMediaItems.Count] : None;
     }
 }

ErsatzTV.Core/Scheduling/CollectionKey.cs

@@ -0,0 +1,88 @@
+using System;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Domain.Filler;
+using LanguageExt;
+
+namespace ErsatzTV.Core.Scheduling
+{
+    public class CollectionKey : Record<CollectionKey>
+    {
+        public static CollectionKey ForScheduleItem(ProgramScheduleItem item) =>
+            item.CollectionType switch
+            {
+                ProgramScheduleItemCollectionType.Collection => new CollectionKey
+                {
+                    CollectionType = item.CollectionType,
+                    CollectionId = item.CollectionId
+                },
+                ProgramScheduleItemCollectionType.TelevisionShow => new CollectionKey
+                {
+                    CollectionType = item.CollectionType,
+                    MediaItemId = item.MediaItemId
+                },
+                ProgramScheduleItemCollectionType.TelevisionSeason => new CollectionKey
+                {
+                    CollectionType = item.CollectionType,
+                    MediaItemId = item.MediaItemId
+                },
+                ProgramScheduleItemCollectionType.Artist => new CollectionKey
+                {
+                    CollectionType = item.CollectionType,
+                    MediaItemId = item.MediaItemId
+                },
+                ProgramScheduleItemCollectionType.MultiCollection => new CollectionKey
+                {
+                    CollectionType = item.CollectionType,
+                    MultiCollectionId = item.MultiCollectionId
+                },
+                ProgramScheduleItemCollectionType.SmartCollection => new CollectionKey
+                {
+                    CollectionType = item.CollectionType,
+                    SmartCollectionId = item.SmartCollectionId
+                },
+                _ => throw new ArgumentOutOfRangeException(nameof(item))
+            };
+        
+        public static CollectionKey ForFillerPreset(FillerPreset filler) =>
+            filler.CollectionType switch
+            {
+                ProgramScheduleItemCollectionType.Collection => new CollectionKey
+                {
+                    CollectionType = filler.CollectionType,
+                    CollectionId = filler.CollectionId
+                },
+                ProgramScheduleItemCollectionType.TelevisionShow => new CollectionKey
+                {
+                    CollectionType = filler.CollectionType,
+                    MediaItemId = filler.MediaItemId
+                },
+                ProgramScheduleItemCollectionType.TelevisionSeason => new CollectionKey
+                {
+                    CollectionType = filler.CollectionType,
+                    MediaItemId = filler.MediaItemId
+                },
+                ProgramScheduleItemCollectionType.Artist => new CollectionKey
+                {
+                    CollectionType = filler.CollectionType,
+                    MediaItemId = filler.MediaItemId
+                },
+                ProgramScheduleItemCollectionType.MultiCollection => new CollectionKey
+                {
+                    CollectionType = filler.CollectionType,
+                    MultiCollectionId = filler.MultiCollectionId
+                },
+                ProgramScheduleItemCollectionType.SmartCollection => new CollectionKey
+                {
+                    CollectionType = filler.CollectionType,
+                    SmartCollectionId = filler.SmartCollectionId
+                },
+                _ => throw new ArgumentOutOfRangeException(nameof(filler))
+            };
+        
+        public ProgramScheduleItemCollectionType CollectionType { get; set; }
+        public int? CollectionId { get; set; }
+        public int? MultiCollectionId { get; set; }
+        public int? SmartCollectionId { get; set; }
+        public int? MediaItemId { get; set; }
+    }
+}

ErsatzTV.Core/Scheduling/CustomOrderCollectionEnumerator.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Scheduling;
@@ -9,13 +10,16 @@ namespace ErsatzTV.Core.Scheduling
 {
     public class CustomOrderCollectionEnumerator : IMediaCollectionEnumerator
     {
+        private readonly Collection _collection;
         private readonly IList<MediaItem> _sortedMediaItems;
 
         public CustomOrderCollectionEnumerator(
             Collection collection,
-            List<MediaItem> mediaItems,
+            IList<MediaItem> mediaItems,
             CollectionEnumeratorState state)
         {
+            _collection = collection;
+
             // TODO: this will break if we allow shows and seasons
             _sortedMediaItems = collection.CollectionItems
                 .OrderBy(ci => ci.CustomIndex)
@@ -34,5 +38,8 @@ namespace ErsatzTV.Core.Scheduling
         public Option<MediaItem> Current => _sortedMediaItems.Any() ? _sortedMediaItems[State.Index] : None;
 
         public void MoveNext() => State.Index = (State.Index + 1) % _sortedMediaItems.Count;
+
+        public Option<MediaItem> Peek(int offset) =>
+            throw new NotSupportedException();
     }
 }

ErsatzTV.Core/Scheduling/MediaItemsForCollection.cs

@@ -0,0 +1,51 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Interfaces.Repositories;
+
+namespace ErsatzTV.Core.Scheduling
+{
+    public static class MediaItemsForCollection
+    {
+        public static async Task<List<MediaItem>> Collect(
+            IMediaCollectionRepository mediaCollectionRepository,
+            ITelevisionRepository televisionRepository,
+            IArtistRepository artistRepository,
+            CollectionKey collectionKey)
+        {
+            switch (collectionKey.CollectionType)
+            {
+                case ProgramScheduleItemCollectionType.Collection:
+                    List<MediaItem> collectionItems =
+                        await mediaCollectionRepository.GetItems(collectionKey.CollectionId ?? 0);
+                    return collectionItems;
+                case ProgramScheduleItemCollectionType.TelevisionShow:
+                    List<Episode> showItems =
+                        await televisionRepository.GetShowItems(collectionKey.MediaItemId ?? 0);
+                    return showItems.Cast<MediaItem>().ToList();
+                case ProgramScheduleItemCollectionType.TelevisionSeason:
+                    List<Episode> seasonItems =
+                        await televisionRepository.GetSeasonItems(collectionKey.MediaItemId ?? 0);
+                    return seasonItems.Cast<MediaItem>().ToList();
+                case ProgramScheduleItemCollectionType.Artist:
+                    List<MusicVideo> artistItems =
+                        await artistRepository.GetArtistItems(collectionKey.MediaItemId ?? 0);
+                    return artistItems.Cast<MediaItem>().ToList();
+                case ProgramScheduleItemCollectionType.MultiCollection:
+                    List<MediaItem> multiCollectionItems =
+                        await mediaCollectionRepository.GetMultiCollectionItems(
+                            collectionKey.MultiCollectionId ?? 0);
+                    return multiCollectionItems;
+                case ProgramScheduleItemCollectionType.SmartCollection:
+                    List<MediaItem> smartCollectionItems =
+                        await mediaCollectionRepository.GetSmartCollectionItems(
+                            collectionKey.SmartCollectionId ?? 0);
+                    return smartCollectionItems;
+                default:
+                    return new List<MediaItem>();
+            }
+        }
+
+    }
+}

ErsatzTV.Core/Scheduling/PlayoutBuilder.cs

@@ -51,58 +51,17 @@ namespace ErsatzTV.Core.Scheduling
             DateTimeOffset playoutFinish,
             bool rebuild = false)
         {
-            var collectionKeys = playout.ProgramSchedule.Items
-                .SelectMany(CollectionKeysForItem)
-                .Distinct()
-                .ToList();
-
-            if (!collectionKeys.Any())
+            Map<CollectionKey, List<MediaItem>> collectionMediaItems = await GetCollectionMediaItems(playout);
+            if (!collectionMediaItems.Any())
             {
                 _logger.LogWarning(
                     "Playout {Playout} schedule {Schedule} has no items",
                     playout.Channel.Name,
                     playout.ProgramSchedule.Name);
+
                 return playout;
             }
 
-            IEnumerable<Tuple<CollectionKey, List<MediaItem>>> tuples = await collectionKeys.Map(
-                async collectionKey =>
-                {
-                    switch (collectionKey.CollectionType)
-                    {
-                        case ProgramScheduleItemCollectionType.Collection:
-                            List<MediaItem> collectionItems =
-                                await _mediaCollectionRepository.GetItems(collectionKey.CollectionId ?? 0);
-                            return Tuple(collectionKey, collectionItems);
-                        case ProgramScheduleItemCollectionType.TelevisionShow:
-                            List<Episode> showItems =
-                                await _televisionRepository.GetShowItems(collectionKey.MediaItemId ?? 0);
-                            return Tuple(collectionKey, showItems.Cast<MediaItem>().ToList());
-                        case ProgramScheduleItemCollectionType.TelevisionSeason:
-                            List<Episode> seasonItems =
-                                await _televisionRepository.GetSeasonItems(collectionKey.MediaItemId ?? 0);
-                            return Tuple(collectionKey, seasonItems.Cast<MediaItem>().ToList());
-                        case ProgramScheduleItemCollectionType.Artist:
-                            List<MusicVideo> artistItems =
-                                await _artistRepository.GetArtistItems(collectionKey.MediaItemId ?? 0);
-                            return Tuple(collectionKey, artistItems.Cast<MediaItem>().ToList());
-                        case ProgramScheduleItemCollectionType.MultiCollection:
-                            List<MediaItem> multiCollectionItems =
-                                await _mediaCollectionRepository.GetMultiCollectionItems(
-                                    collectionKey.MultiCollectionId ?? 0);
-                            return Tuple(collectionKey, multiCollectionItems);
-                        case ProgramScheduleItemCollectionType.SmartCollection:
-                            List<MediaItem> smartCollectionItems =
-                                await _mediaCollectionRepository.GetSmartCollectionItems(
-                                    collectionKey.SmartCollectionId ?? 0);
-                            return Tuple(collectionKey, smartCollectionItems);
-                        default:
-                            return Tuple(collectionKey, new List<MediaItem>());
-                    }
-                }).Sequence();
-
-            var collectionMediaItems = Map.createRange(tuples);
-
             _logger.LogDebug(
                 "{Action} playout {PlayoutId} for channel {ChannelNumber} - {ChannelName}",
                 rebuild ? "Rebuilding" : "Building",
@@ -110,6 +69,188 @@ namespace ErsatzTV.Core.Scheduling
                 playout.Channel.Number,
                 playout.Channel.Name);
 
+            Option<CollectionKey> maybeEmptyCollection = await CheckForEmptyCollections(collectionMediaItems);
+            foreach (CollectionKey emptyCollection in maybeEmptyCollection)
+            {
+                _logger.LogError(
+                    "Unable to rebuild playout; collection {@CollectionKey} has no valid items!",
+                    emptyCollection);
+
+                return playout;
+            }
+
+            playout.Items ??= new List<PlayoutItem>();
+            playout.ProgramScheduleAnchors ??= new List<PlayoutProgramScheduleAnchor>();
+
+            if (rebuild)
+            {
+                playout.Items.Clear();
+                playout.Anchor = null;
+                playout.ProgramScheduleAnchors.Clear();
+            }
+
+            var sortedScheduleItems = playout.ProgramSchedule.Items.OrderBy(i => i.Index).ToList();
+            var collectionEnumerators = new Dictionary<CollectionKey, IMediaCollectionEnumerator>();
+            foreach ((CollectionKey collectionKey, List<MediaItem> mediaItems) in collectionMediaItems)
+            {
+                // use configured playback order for primary collection, shuffle for filler
+                Option<ProgramScheduleItem> maybeScheduleItem = sortedScheduleItems
+                    .FirstOrDefault(item => CollectionKey.ForScheduleItem(item) == collectionKey);
+                PlaybackOrder playbackOrder = maybeScheduleItem
+                    .Match(item => item.PlaybackOrder, () => PlaybackOrder.Shuffle);
+                IMediaCollectionEnumerator enumerator =
+                    await GetMediaCollectionEnumerator(playout, collectionKey, mediaItems, playbackOrder);
+                collectionEnumerators.Add(collectionKey, enumerator);
+            }
+
+            // find start anchor
+            PlayoutAnchor startAnchor = FindStartAnchor(playout, playoutStart, sortedScheduleItems);
+
+            // start at the previously-decided time
+            DateTimeOffset currentTime = startAnchor.NextStartOffset.ToLocalTime();
+            _logger.LogDebug(
+                "Starting playout {PlayoutId} for channel {ChannelNumber} - {ChannelName} at {StartTime}",
+                playout.Id,
+                playout.Channel.Number,
+                playout.Channel.Name,
+                currentTime);
+            
+            // removing any items scheduled past the start anchor
+            // this could happen if the app was closed after scheduling items
+            // but before saving the anchor
+            int removed = playout.Items.RemoveAll(pi => pi.StartOffset >= currentTime);
+            if (removed > 0)
+            {
+                _logger.LogWarning("Removed {Count} schedule items beyond current start anchor", removed);
+            }
+
+            // start with the previously-decided schedule item
+            // start with the previous multiple/duration states
+            var playoutBuilderState = new PlayoutBuilderState(
+                sortedScheduleItems.IndexOf(startAnchor.NextScheduleItem),
+                Optional(startAnchor.MultipleRemaining),
+                startAnchor.DurationFinishOffset,
+                startAnchor.InFlood,
+                startAnchor.InDurationFiller,
+                startAnchor.NextGuideGroup,
+                currentTime);
+
+            var schedulerOne = new PlayoutModeSchedulerOne(_logger);
+            var schedulerMultiple = new PlayoutModeSchedulerMultiple(collectionMediaItems, _logger);
+            var schedulerDuration = new PlayoutModeSchedulerDuration(_logger);
+            var schedulerFlood = new PlayoutModeSchedulerFlood(sortedScheduleItems, _logger);
+
+            // loop until we're done filling the desired amount of time
+            while (playoutBuilderState.CurrentTime < playoutFinish)
+            {
+                // get the schedule item out of the sorted list
+                ProgramScheduleItem scheduleItem =
+                    sortedScheduleItems[playoutBuilderState.ScheduleItemIndex % sortedScheduleItems.Count];
+
+                ProgramScheduleItem nextScheduleItem =
+                    sortedScheduleItems[(playoutBuilderState.ScheduleItemIndex + 1) % sortedScheduleItems.Count];
+
+                Tuple<PlayoutBuilderState, List<PlayoutItem>> result = scheduleItem switch
+                {
+                    ProgramScheduleItemMultiple multiple => schedulerMultiple.Schedule(
+                        playoutBuilderState,
+                        collectionEnumerators,
+                        multiple,
+                        nextScheduleItem,
+                        playoutFinish),
+                    ProgramScheduleItemDuration duration => schedulerDuration.Schedule(
+                        playoutBuilderState,
+                        collectionEnumerators,
+                        duration,
+                        nextScheduleItem,
+                        playoutFinish),
+                    ProgramScheduleItemFlood flood => schedulerFlood.Schedule(
+                        playoutBuilderState,
+                        collectionEnumerators,
+                        flood,
+                        nextScheduleItem,
+                        playoutFinish),
+                    ProgramScheduleItemOne one => schedulerOne.Schedule(
+                        playoutBuilderState,
+                        collectionEnumerators,
+                        one,
+                        nextScheduleItem,
+                        playoutFinish),
+                    _ => throw new ArgumentOutOfRangeException(nameof(scheduleItem))
+                };
+
+                (PlayoutBuilderState nextState, List<PlayoutItem> playoutItems) = result;
+
+                foreach (PlayoutItem playoutItem in playoutItems)
+                {
+                    playout.Items.Add(playoutItem);
+                }
+
+                playoutBuilderState = nextState;
+            }
+
+            // once more to get playout anchor
+            ProgramScheduleItem anchorScheduleItem =
+                sortedScheduleItems[playoutBuilderState.ScheduleItemIndex % sortedScheduleItems.Count];
+
+            // build program schedule anchors
+            playout.ProgramScheduleAnchors = BuildProgramScheduleAnchors(playout, collectionEnumerators);
+
+            // remove any items outside the desired range
+            playout.Items.RemoveAll(
+                old => old.FinishOffset < playoutStart.AddHours(-4) || old.StartOffset > playoutFinish);
+
+            if (playout.Items.Any())
+            {
+                DateTimeOffset maxStartTime = playout.Items.Max(i => i.FinishOffset);
+                if (maxStartTime < playoutBuilderState.CurrentTime)
+                {
+                    playoutBuilderState = playoutBuilderState with { CurrentTime = maxStartTime };
+                }
+            }
+
+            playout.Anchor = new PlayoutAnchor
+            {
+                NextScheduleItem = anchorScheduleItem,
+                NextScheduleItemId = anchorScheduleItem.Id,
+                NextStart = PlayoutModeSchedulerBase<ProgramScheduleItem>.GetStartTimeAfter(playoutBuilderState, anchorScheduleItem)
+                    .UtcDateTime,
+                MultipleRemaining = playoutBuilderState.MultipleRemaining.IsSome
+                    ? playoutBuilderState.MultipleRemaining.ValueUnsafe()
+                    : null,
+                DurationFinish = playoutBuilderState.DurationFinish.IsSome
+                    ? playoutBuilderState.DurationFinish.ValueUnsafe().UtcDateTime
+                    : null,
+                InFlood = playoutBuilderState.InFlood,
+                InDurationFiller = playoutBuilderState.InDurationFiller,
+                NextGuideGroup = playoutBuilderState.NextGuideGroup
+            };
+
+            return playout;
+        }
+
+        private async Task<Map<CollectionKey, List<MediaItem>>> GetCollectionMediaItems(Playout playout)
+        {
+            var collectionKeys = playout.ProgramSchedule.Items
+                .SelectMany(CollectionKeysForItem)
+                .Distinct()
+                .ToList();
+
+            IEnumerable<Tuple<CollectionKey, List<MediaItem>>> tuples = await collectionKeys.Map(
+                async collectionKey => Tuple(
+                    collectionKey,
+                    await MediaItemsForCollection.Collect(
+                        _mediaCollectionRepository,
+                        _televisionRepository,
+                        _artistRepository,
+                        collectionKey))).SequenceParallel();
+
+            return Map.createRange(tuples);
+        }
+
+        private async Task<Option<CollectionKey>> CheckForEmptyCollections(
+            Map<CollectionKey, List<MediaItem>> collectionMediaItems)
+        {
             foreach ((CollectionKey _, List<MediaItem> items) in collectionMediaItems)
             {
                 var zeroItems = new List<MediaItem>();
@@ -143,415 +284,9 @@ namespace ErsatzTV.Core.Scheduling
                 items.RemoveAll(i => zeroItems.Contains(i));
             }
 
-            // this guard needs to be below the place where we modify the collections (by removing zero-duration items)
-            Option<CollectionKey> emptyCollection =
-                collectionMediaItems.Find(c => !c.Value.Any()).Map(c => c.Key);
-            if (emptyCollection.IsSome)
-            {
-                _logger.LogError(
-                    "Unable to rebuild playout; collection {@CollectionKey} has no valid items!",
-                    emptyCollection.ValueUnsafe());
-
-                return playout;
-            }
-
-            // leaving this guard in for a while to ensure the zero item removal is working properly
-            Option<CollectionKey> zeroDurationCollection = collectionMediaItems.Find(
-                c => c.Value.Any(
-                    mi => mi switch
-                    {
-                        Movie m => m.MediaVersions.HeadOrNone().Map(mv => mv.Duration)
-                            .IfNone(TimeSpan.Zero) == TimeSpan.Zero,
-                        Episode e => e.MediaVersions.HeadOrNone().Map(mv => mv.Duration)
-                            .IfNone(TimeSpan.Zero) == TimeSpan.Zero,
-                        MusicVideo mv => mv.MediaVersions.HeadOrNone().Map(v => v.Duration)
-                            .IfNone(TimeSpan.Zero) == TimeSpan.Zero,
-                        OtherVideo ov => ov.MediaVersions.HeadOrNone().Map(v => v.Duration)
-                            .IfNone(TimeSpan.Zero) == TimeSpan.Zero,
-                        _ => true
-                    })).Map(c => c.Key);
-            if (zeroDurationCollection.IsSome)
-            {
-                _logger.LogError(
-                    "BUG: Unable to rebuild playout; collection {@CollectionKey} contains items with zero duration!",
-                    zeroDurationCollection.ValueUnsafe());
-
-                return playout;
-            }
-
-            playout.Items ??= new List<PlayoutItem>();
-            playout.ProgramScheduleAnchors ??= new List<PlayoutProgramScheduleAnchor>();
-
-            if (rebuild)
-            {
-                playout.Items.Clear();
-                playout.Anchor = null;
-                playout.ProgramScheduleAnchors.Clear();
-            }
-
-            var sortedScheduleItems =
-                playout.ProgramSchedule.Items.OrderBy(i => i.Index).ToList();
-            var collectionEnumerators = new Dictionary<CollectionKey, IMediaCollectionEnumerator>();
-            foreach ((CollectionKey collectionKey, List<MediaItem> mediaItems) in collectionMediaItems)
-            {
-                // use configured playback order for primary collection, shuffle for filler
-                Option<ProgramScheduleItem> maybeScheduleItem = sortedScheduleItems
-                    .FirstOrDefault(item => CollectionKeyForItem(item) == collectionKey);
-                PlaybackOrder playbackOrder = maybeScheduleItem
-                    .Match(item => item.PlaybackOrder, () => PlaybackOrder.Shuffle);
-                IMediaCollectionEnumerator enumerator =
-                    await GetMediaCollectionEnumerator(playout, collectionKey, mediaItems, playbackOrder);
-                collectionEnumerators.Add(collectionKey, enumerator);
-            }
-
-            // find start anchor
-            PlayoutAnchor startAnchor = FindStartAnchor(playout, playoutStart, sortedScheduleItems);
-
-            // start at the previously-decided time
-            DateTimeOffset currentTime = startAnchor.NextStartOffset.ToLocalTime();
-            _logger.LogDebug(
-                "Starting playout {PlayoutId} for channel {ChannelNumber} - {ChannelName} at {StartTime}",
-                playout.Id,
-                playout.Channel.Number,
-                playout.Channel.Name,
-                currentTime);
-            
-            // removing any items scheduled past the start anchor
-            // this could happen if the app was closed after scheduling items
-            // but before saving the anchor
-            int removed = playout.Items.RemoveAll(pi => pi.StartOffset >= currentTime);
-            if (removed > 0)
-            {
-                _logger.LogWarning("Removed {Count} schedule items beyond current start anchor", removed);
-            }
-
-            // start with the previously-decided schedule item
-            int index = sortedScheduleItems.IndexOf(startAnchor.NextScheduleItem);
-
-            // start with the previous multiple/duration states
-            Option<int> multipleRemaining = Optional(startAnchor.MultipleRemaining);
-            Option<DateTimeOffset> durationFinish = startAnchor.DurationFinishOffset;
-            bool inFlood = startAnchor.InFlood;
-            bool inDurationFiller = startAnchor.InDurationFiller;
-
-            bool customGroup = multipleRemaining.IsSome || durationFinish.IsSome;
-
-            // loop until we're done filling the desired amount of time
-            while (currentTime < playoutFinish)
-            {
-                // get the schedule item out of the sorted list
-                ProgramScheduleItem scheduleItem = sortedScheduleItems[index % sortedScheduleItems.Count];
-
-                // find when we should start this item, based on the current time
-                DateTimeOffset itemStartTime = GetStartTimeAfter(
-                    scheduleItem,
-                    currentTime,
-                    multipleRemaining.IsSome,
-                    durationFinish.IsSome,
-                    inFlood,
-                    inDurationFiller);
-                
-                Option<CollectionKey> maybeTailCollectionKey = Option<CollectionKey>.None;
-                if (inDurationFiller && scheduleItem is ProgramScheduleItemDuration
-                {
-                    TailMode: TailMode.Filler
-                })
-                {
-                    maybeTailCollectionKey = TailCollectionKeyForItem(scheduleItem);
-                }
-
-                IMediaCollectionEnumerator enumerator = collectionEnumerators[CollectionKeyForItem(scheduleItem)];
-                foreach (CollectionKey tailCollectionKey in maybeTailCollectionKey)
-                {
-                    enumerator = collectionEnumerators[tailCollectionKey];
-                }
-
-                await enumerator.Current.IfSomeAsync(
-                    mediaItem =>
-                    {
-                        _logger.LogDebug(
-                            "Scheduling media item: {ScheduleItemNumber} / {CollectionType} / {MediaItemId} - {MediaItemTitle} / {StartTime}",
-                            scheduleItem.Index,
-                            inDurationFiller
-                                ? (scheduleItem as ProgramScheduleItemDuration)?.TailCollectionType
-                                : scheduleItem.CollectionType,
-                            mediaItem.Id,
-                            DisplayTitle(mediaItem),
-                            itemStartTime);
-
-                        MediaVersion version = mediaItem switch
-                        {
-                            Movie m => m.MediaVersions.Head(),
-                            Episode e => e.MediaVersions.Head(),
-                            MusicVideo mv => mv.MediaVersions.Head(),
-                            OtherVideo mv => mv.MediaVersions.Head(),
-                            _ => throw new ArgumentOutOfRangeException(nameof(mediaItem))
-                        };
-
-                        var playoutItem = new PlayoutItem
-                        {
-                            MediaItemId = mediaItem.Id,
-                            Start = itemStartTime.UtcDateTime,
-                            Finish = itemStartTime.UtcDateTime + version.Duration,
-                            CustomGroup = customGroup,
-                            IsFiller = inDurationFiller || scheduleItem.GuideMode == GuideMode.Filler
-                        };
-
-                        if (!string.IsNullOrWhiteSpace(scheduleItem.CustomTitle))
-                        {
-                            playoutItem.CustomTitle = scheduleItem.CustomTitle;
-                        }
-
-                        enumerator.MoveNext();
-                        
-                        if (scheduleItem is ProgramScheduleItemDuration d &&
-                            version.Duration > d.PlayoutDuration)
-                        {
-                            _logger.LogWarning(
-                                "Skipping playout item {Title} with duration {Duration} that is longer than schedule item duration {PlayoutDuration}",
-                                DisplayTitle(mediaItem),
-                                version.Duration,
-                                d.PlayoutDuration);
-                            return;
-                        }
-
-                        currentTime = itemStartTime + version.Duration;
-                        playout.Items.Add(playoutItem);
-
-                        switch (scheduleItem)
-                        {
-                            case ProgramScheduleItemOne:
-                                // only play one item from collection, so always advance to the next item
-                                _logger.LogDebug(
-                                    "Advancing to next schedule item after playout mode {PlayoutMode}",
-                                    "One");
-                                index++;
-                                customGroup = false;
-                                break;
-                            case ProgramScheduleItemMultiple multiple:
-                                if (multipleRemaining.IsNone)
-                                {
-                                    if (multiple.Count == 0)
-                                    {
-                                        multipleRemaining = collectionMediaItems[CollectionKeyForItem(scheduleItem)]
-                                            .Count;
-                                    }
-                                    else
-                                    {
-                                        multipleRemaining = multiple.Count;
-                                    }
-
-                                    customGroup = true;
-                                }
-
-                                multipleRemaining = multipleRemaining.Map(i => i - 1);
-                                if (multipleRemaining.IfNone(-1) == 0)
-                                {
-                                    _logger.LogDebug(
-                                        "Advancing to next schedule item after playout mode {PlayoutMode}",
-                                        "Multiple");
-                                    index++;
-                                    multipleRemaining = None;
-                                    customGroup = false;
-                                }
-
-                                break;
-                            case ProgramScheduleItemFlood:
-                                enumerator.Current.Do(
-                                    peekMediaItem =>
-                                    {
-                                        customGroup = true;
-
-                                        MediaVersion peekVersion = peekMediaItem switch
-                                        {
-                                            Movie m => m.MediaVersions.Head(),
-                                            Episode e => e.MediaVersions.Head(),
-                                            MusicVideo mv => mv.MediaVersions.Head(),
-                                            OtherVideo ov => ov.MediaVersions.Head(),
-                                            _ => throw new ArgumentOutOfRangeException(nameof(peekMediaItem))
-                                        };
-
-                                        ProgramScheduleItem peekScheduleItem =
-                                            sortedScheduleItems[(index + 1) % sortedScheduleItems.Count];
-                                        DateTimeOffset peekScheduleItemStart =
-                                            peekScheduleItem.StartType == StartType.Fixed
-                                                ? GetStartTimeAfter(peekScheduleItem, currentTime)
-                                                : DateTimeOffset.MaxValue;
-
-                                        // if the current time is before the next schedule item, but the current finish
-                                        // is after, we need to move on to the next schedule item
-                                        // eventually, spots probably have to fit in this gap
-                                        bool willNotFinishInTime = currentTime <= peekScheduleItemStart &&
-                                                                   currentTime + peekVersion.Duration >
-                                                                   peekScheduleItemStart;
-                                        if (willNotFinishInTime)
-                                        {
-                                            _logger.LogDebug(
-                                                "Advancing to next schedule item after playout mode {PlayoutMode}",
-                                                "Flood");
-                                            index++;
-                                            customGroup = false;
-                                            inFlood = false;
-                                        }
-                                        else
-                                        {
-                                            inFlood = true;
-                                        }
-                                    });
-                                break;
-                            case ProgramScheduleItemDuration duration:
-                                enumerator.Current.Do(
-                                    peekMediaItem =>
-                                    {
-                                        MediaVersion peekVersion = peekMediaItem switch
-                                        {
-                                            Movie m => m.MediaVersions.Head(),
-                                            Episode e => e.MediaVersions.Head(),
-                                            MusicVideo mv => mv.MediaVersions.Head(),
-                                            OtherVideo ov => ov.MediaVersions.Head(),
-                                            _ => throw new ArgumentOutOfRangeException(nameof(peekMediaItem))
-                                        };
-
-                                        // remember when we need to finish this duration item
-                                        if (durationFinish.IsNone)
-                                        {
-                                            durationFinish = itemStartTime + duration.PlayoutDuration;
-                                            customGroup = true;
-                                        }
-
-                                        bool willNotFinishInTime =
-                                            currentTime <= durationFinish.IfNone(SystemTime.MinValueUtc) &&
-                                            currentTime + peekVersion.Duration >
-                                            durationFinish.IfNone(SystemTime.MinValueUtc);
-                                        if (willNotFinishInTime)
-                                        {
-                                            _logger.LogDebug(
-                                                "Advancing to next schedule item after playout mode {PlayoutMode}",
-                                                "Duration");
-                                            index++;
-
-                                            if (duration.TailMode == TailMode.Offline)
-                                            {
-                                                durationFinish.Do(f => currentTime = f);
-                                            }
-
-                                            if (duration.TailMode != TailMode.Filler || inDurationFiller)
-                                            {
-                                                if (duration.TailMode != TailMode.None)
-                                                {
-                                                    durationFinish.Do(f => currentTime = f);
-                                                }
-
-                                                durationFinish = None;
-                                                inDurationFiller = false;
-                                                customGroup = false;
-                                            }
-                                            else if (duration.TailMode == TailMode.Filler &&
-                                                     WillFinishFillerInTime(
-                                                         scheduleItem,
-                                                         currentTime,
-                                                         durationFinish,
-                                                         collectionEnumerators))
-                                            {
-                                                // if we're starting filler, we don't actually need to move
-                                                // to the next schedule item yet
-                                                index--;
-
-                                                inDurationFiller = true;
-                                                durationFinish.Do(
-                                                    f => playoutItem.GuideFinish = f.UtcDateTime);
-                                            }
-                                        }
-                                    }
-                                );
-                                break;
-                        }
-                    });
-            }
-
-            // once more to get playout anchor
-            ProgramScheduleItem nextScheduleItem = sortedScheduleItems[index % sortedScheduleItems.Count];
-
-            // build program schedule anchors
-            playout.ProgramScheduleAnchors = BuildProgramScheduleAnchors(playout, collectionEnumerators);
-
-            // remove any items outside the desired range
-            playout.Items.RemoveAll(
-                old => old.FinishOffset < playoutStart.AddHours(-4) || old.StartOffset > playoutFinish);
-
-            DateTimeOffset minCurrentTime = currentTime;
-            if (playout.Items.Any())
-            {
-                DateTimeOffset maxStartTime = playout.Items.Max(i => i.FinishOffset);
-                if (maxStartTime < currentTime)
-                {
-                    minCurrentTime = maxStartTime;
-                }
-            }
-            
-            playout.Anchor = new PlayoutAnchor
-            {
-                NextScheduleItem = nextScheduleItem,
-                NextScheduleItemId = nextScheduleItem.Id,
-                NextStart = GetStartTimeAfter(nextScheduleItem, minCurrentTime).UtcDateTime,
-                MultipleRemaining = multipleRemaining.IsSome ? multipleRemaining.ValueUnsafe() : null,
-                DurationFinish = durationFinish.IsSome ? durationFinish.ValueUnsafe().UtcDateTime : null,
-                InFlood = inFlood,
-                InDurationFiller = inDurationFiller
-            };
-
-            return playout;
+            return collectionMediaItems.Find(c => !c.Value.Any()).Map(c => c.Key);
         }
-
-        private static bool WillFinishFillerInTime(
-            ProgramScheduleItem scheduleItem,
-            DateTimeOffset currentTime,
-            Option<DateTimeOffset> durationFinish,
-            Dictionary<CollectionKey, IMediaCollectionEnumerator> collectionEnumerators)
-        {
-            Option<CollectionKey> maybeTailCollectionKey = Option<CollectionKey>.None;
-            if (scheduleItem is ProgramScheduleItemDuration
-            {
-                TailMode: TailMode.Filler
-            })
-            {
-                maybeTailCollectionKey = TailCollectionKeyForItem(scheduleItem);
-            }
-
-            foreach (CollectionKey collectionKey in maybeTailCollectionKey)
-            {
-                IMediaCollectionEnumerator enumerator = collectionEnumerators[collectionKey];
-                Option<int> firstId = enumerator.Current.Map(i => i.Id);
-                while (true)
-                {
-                    foreach (MediaItem peekMediaItem in enumerator.Current)
-                    {
-                        MediaVersion peekVersion = peekMediaItem switch
-                        {
-                            Movie m => m.MediaVersions.Head(),
-                            Episode e => e.MediaVersions.Head(),
-                            MusicVideo mv => mv.MediaVersions.Head(),
-                            OtherVideo ov => ov.MediaVersions.Head(),
-                            _ => throw new ArgumentOutOfRangeException(nameof(peekMediaItem))
-                        };
-
-                        if (currentTime + peekVersion.Duration <= durationFinish.IfNone(SystemTime.MinValueUtc))
-                        {
-                            return true;
-                        }
-                    }
-
-                    enumerator.MoveNext();
-                    if (enumerator.Current.Map(i => i.Id) == firstId)
-                    {
-                        return false;
-                    }
-                }
-            }
-
-            return false;
-        }
-
+        
         private static PlayoutAnchor FindStartAnchor(
             Playout playout,
             DateTimeOffset start,
@@ -581,35 +316,6 @@ namespace ErsatzTV.Core.Scheduling
                     }
                 });
 
-        private static DateTimeOffset GetStartTimeAfter(
-            ProgramScheduleItem item,
-            DateTimeOffset start,
-            bool inMultiple = false,
-            bool inDuration = false,
-            bool inFlood = false,
-            bool inDurationFiller = false)
-        {
-            switch (item.StartType)
-            {
-                case StartType.Fixed:
-                    if (item is ProgramScheduleItemMultiple && inMultiple ||
-                        item is ProgramScheduleItemDuration && inDuration ||
-                        item is ProgramScheduleItemFlood && inFlood ||
-                        item is ProgramScheduleItemDuration && inDurationFiller)
-                    {
-                        return start;
-                    }
-
-                    TimeSpan startTime = item.StartTime.GetValueOrDefault();
-                    DateTimeOffset result = start.Date + startTime;
-                    // need to wrap to the next day if appropriate
-                    return start.TimeOfDay > startTime ? result.AddDays(1) : result;
-                case StartType.Dynamic:
-                default:
-                    return start;
-            }
-        }
-
         private static List<PlayoutProgramScheduleAnchor> BuildProgramScheduleAnchors(
             Playout playout,
             Dictionary<CollectionKey, IMediaCollectionEnumerator> collectionEnumerators)
@@ -746,7 +452,7 @@ namespace ErsatzTV.Core.Scheduling
             return result;
         }
 
-        private static string DisplayTitle(MediaItem mediaItem)
+        internal static string DisplayTitle(MediaItem mediaItem)
         {
             switch (mediaItem)
             {
@@ -775,97 +481,37 @@ namespace ErsatzTV.Core.Scheduling
 
         private static List<CollectionKey> CollectionKeysForItem(ProgramScheduleItem item)
         {
-            var result = new List<CollectionKey> { CollectionKeyForItem(item) };
-            result.AddRange(TailCollectionKeyForItem(item));
-            return result;
-        }
-
-        private static CollectionKey CollectionKeyForItem(ProgramScheduleItem item) =>
-            item.CollectionType switch
+            var result = new List<CollectionKey>
             {
-                ProgramScheduleItemCollectionType.Collection => new CollectionKey
-                {
-                    CollectionType = item.CollectionType,
-                    CollectionId = item.CollectionId
-                },
-                ProgramScheduleItemCollectionType.TelevisionShow => new CollectionKey
-                {
-                    CollectionType = item.CollectionType,
-                    MediaItemId = item.MediaItemId
-                },
-                ProgramScheduleItemCollectionType.TelevisionSeason => new CollectionKey
-                {
-                    CollectionType = item.CollectionType,
-                    MediaItemId = item.MediaItemId
-                },
-                ProgramScheduleItemCollectionType.Artist => new CollectionKey
-                {
-                    CollectionType = item.CollectionType,
-                    MediaItemId = item.MediaItemId
-                },
-                ProgramScheduleItemCollectionType.MultiCollection => new CollectionKey
-                {
-                    CollectionType = item.CollectionType,
-                    MultiCollectionId = item.MultiCollectionId
-                },
-                ProgramScheduleItemCollectionType.SmartCollection => new CollectionKey
-                {
-                    CollectionType = item.CollectionType,
-                    SmartCollectionId = item.SmartCollectionId
-                },
-                _ => throw new ArgumentOutOfRangeException(nameof(item))
+                CollectionKey.ForScheduleItem(item)
             };
 
-        private static Option<CollectionKey> TailCollectionKeyForItem(ProgramScheduleItem item)
-        {
-            if (item is ProgramScheduleItemDuration { TailMode: TailMode.Filler } duration)
+            if (item.PreRollFiller != null)
             {
-                return duration.TailCollectionType switch
-                {
-                    ProgramScheduleItemCollectionType.Collection => new CollectionKey
-                    {
-                        CollectionType = duration.TailCollectionType,
-                        CollectionId = duration.TailCollectionId
-                    },
-                    ProgramScheduleItemCollectionType.TelevisionShow => new CollectionKey
-                    {
-                        CollectionType = duration.TailCollectionType,
-                        MediaItemId = duration.TailMediaItemId
-                    },
-                    ProgramScheduleItemCollectionType.TelevisionSeason => new CollectionKey
-                    {
-                        CollectionType = duration.TailCollectionType,
-                        MediaItemId = duration.TailMediaItemId
-                    },
-                    ProgramScheduleItemCollectionType.Artist => new CollectionKey
-                    {
-                        CollectionType = duration.TailCollectionType,
-                        MediaItemId = duration.TailMediaItemId
-                    },
-                    ProgramScheduleItemCollectionType.MultiCollection => new CollectionKey
-                    {
-                        CollectionType = duration.TailCollectionType,
-                        MultiCollectionId = duration.TailMultiCollectionId
-                    },
-                    ProgramScheduleItemCollectionType.SmartCollection => new CollectionKey
-                    {
-                        CollectionType = duration.TailCollectionType,
-                        SmartCollectionId = duration.TailSmartCollectionId
-                    },
-                    _ => throw new ArgumentOutOfRangeException(nameof(item))
-                };
+                result.Add(CollectionKey.ForFillerPreset(item.PreRollFiller));
             }
 
-            return None;
-        }
+            if (item.MidRollFiller != null)
+            {
+                result.Add(CollectionKey.ForFillerPreset(item.MidRollFiller));
+            }
 
-        private class CollectionKey : Record<CollectionKey>
-        {
-            public ProgramScheduleItemCollectionType CollectionType { get; set; }
-            public int? CollectionId { get; set; }
-            public int? MultiCollectionId { get; set; }
-            public int? SmartCollectionId { get; set; }
-            public int? MediaItemId { get; set; }
+            if (item.PostRollFiller != null)
+            {
+                result.Add(CollectionKey.ForFillerPreset(item.PostRollFiller));
+            }
+
+            if (item.TailFiller != null)
+            {
+                result.Add(CollectionKey.ForFillerPreset(item.TailFiller));
+            }
+
+            if (item.FallbackFiller != null)
+            {
+                result.Add(CollectionKey.ForFillerPreset(item.FallbackFiller));
+            }
+
+            return result;
         }
     }
 }