add "on demand" channel progress mode (#1790)

* update dependencies

* add channel progress mode

* implement on demand channel progress

* update changelog

CHANGELOG.md

@@ -9,6 +9,13 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   - These libraries will now appear as ETV Other Video libraries
   - Items in these libraries will have tag metadata added from folders just like local Other Video libraries
   - Thanks @raknam for adding this feature!
+- Add *experimental* support for `On Demand` channel progress
+  - With `On Demand` channel progress, the schedule will only advance when the channel is being streamed
+  - When the channel is idle, the schedule is unmodified and will be shifted forward as needed so no content is missed
+  - Setting a channel to `On Demand` progress will disable alternate schedules
+  - The `On Demand` setting will only be used for `Flood` playouts (NOT `Block` or `External JSON`)
+  - It is NOT recommended to use fixed start times with `On Demand` progress
+    - This will probably be disabled with a future update
 
 ### Fixed
 - Add basic cache busting to XMLTV image URLs

ErsatzTV.Application/Channels/ChannelViewModel.cs

@@ -12,6 +12,7 @@ public record ChannelViewModel(
     string Logo,
     string PreferredAudioLanguageCode,
     string PreferredAudioTitle,
+    ChannelProgressMode ProgressMode,
     StreamingMode StreamingMode,
     int? WatermarkId,
     int? FallbackFillerId,

ErsatzTV.Application/Channels/Commands/CreateChannel.cs

@@ -12,6 +12,7 @@ public record CreateChannel(
     string Logo,
     string PreferredAudioLanguageCode,
     string PreferredAudioTitle,
+    ChannelProgressMode ProgressMode,
     StreamingMode StreamingMode,
     int? WatermarkId,
     int? FallbackFillerId,

ErsatzTV.Application/Channels/Commands/CreateChannelHandler.cs

@@ -73,6 +73,7 @@ public class CreateChannelHandler(
                     Group = request.Group,
                     Categories = request.Categories,
                     FFmpegProfileId = ffmpegProfileId,
+                    ProgressMode = request.ProgressMode,
                     StreamingMode = request.StreamingMode,
                     Artwork = artwork,
                     PreferredAudioLanguageCode = preferredAudioLanguageCode,

ErsatzTV.Application/Channels/Commands/UpdateChannel.cs

@@ -13,6 +13,7 @@ public record UpdateChannel(
     string Logo,
     string PreferredAudioLanguageCode,
     string PreferredAudioTitle,
+    ChannelProgressMode ProgressMode,
     StreamingMode StreamingMode,
     int? WatermarkId,
     int? FallbackFillerId,

ErsatzTV.Application/Channels/Commands/UpdateChannelHandler.cs

@@ -67,6 +67,7 @@ public class UpdateChannelHandler(
                 });
         }
 
+        c.ProgressMode = update.ProgressMode;
         c.StreamingMode = update.StreamingMode;
         c.WatermarkId = update.WatermarkId;
         c.FallbackFillerId = update.FallbackFillerId;

ErsatzTV.Application/Channels/Mapper.cs

@@ -16,6 +16,7 @@ internal static class Mapper
             GetLogo(channel),
             channel.PreferredAudioLanguageCode,
             channel.PreferredAudioTitle,
+            channel.ProgressMode,
             channel.StreamingMode,
             channel.WatermarkId,
             channel.FallbackFillerId,

ErsatzTV.Application/ErsatzTV.Application.csproj

@@ -12,7 +12,7 @@
       <PackageReference Include="Bugsnag" Version="3.1.0" />
       <PackageReference Include="CliWrap" Version="3.6.6" />
       <PackageReference Include="Humanizer.Core" Version="2.14.1" />
-      <PackageReference Include="MediatR" Version="12.2.0" />
+      <PackageReference Include="MediatR" Version="12.3.0" />
       <PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="8.0.0" />
       <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="8.0.0" />
       <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.10.48">
@@ -20,8 +20,8 @@
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       </PackageReference>
       <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-      <PackageReference Include="Serilog.Formatting.Compact.Reader" Version="3.0.0" />
+      <PackageReference Include="Serilog.Formatting.Compact.Reader" Version="4.0.0" />
-      <PackageReference Include="WebMarkupMin.Core" Version="2.16.0" />
+      <PackageReference Include="WebMarkupMin.Core" Version="2.16.2" />
       <PackageReference Include="Winista.MimeDetect" Version="1.1.0" />
     </ItemGroup>
 

ErsatzTV.Application/Playouts/Commands/CreateFloodPlayoutHandler.cs

@@ -37,6 +37,10 @@ public class CreateFloodPlayoutHandler : IRequestHandler<CreateFloodPlayout, Eit
         await dbContext.Playouts.AddAsync(playout);
         await dbContext.SaveChangesAsync();
         await _channel.WriteAsync(new BuildPlayout(playout.Id, PlayoutBuildMode.Reset));
+        if (playout.Channel.ProgressMode is ChannelProgressMode.OnDemand)
+        {
+            await _channel.WriteAsync(new TimeShiftOnDemandPlayout(playout.Channel.Number, DateTimeOffset.Now, false));
+        }
         await _channel.WriteAsync(new RefreshChannelList());
         return new CreatePlayoutResponse(playout.Id);
     }

ErsatzTV.Application/Playouts/Commands/TimeShiftOnDemandPlayout.cs

@@ -0,0 +1,6 @@
+using ErsatzTV.Core;
+
+namespace ErsatzTV.Application.Playouts;
+
+public record TimeShiftOnDemandPlayout(string ChannelNumber, DateTimeOffset Now, bool Force)
+    : IRequest<Option<BaseError>>, IBackgroundServiceRequest;

ErsatzTV.Application/Playouts/Commands/TimeShiftOnDemandPlayoutHandler.cs

@@ -0,0 +1,41 @@
+using ErsatzTV.Core;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Interfaces.Scheduling;
+using ErsatzTV.Infrastructure.Data;
+using ErsatzTV.Infrastructure.Extensions;
+using Microsoft.EntityFrameworkCore;
+
+namespace ErsatzTV.Application.Playouts;
+
+public class TimeShiftOnDemandPlayoutHandler(
+    IPlayoutTimeShifter playoutTimeShifter,
+    IDbContextFactory<TvContext> dbContextFactory)
+    : IRequestHandler<TimeShiftOnDemandPlayout, Option<BaseError>>
+{
+    public async Task<Option<BaseError>> Handle(TimeShiftOnDemandPlayout request, CancellationToken cancellationToken)
+    {
+        try
+        {
+            await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync(cancellationToken);
+
+            Option<Playout> maybePlayout = await dbContext.Playouts
+                .Include(p => p.Channel)
+                .Include(p => p.Items)
+                .Include(p => p.Anchor)
+                .Include(p => p.ProgramScheduleAnchors)
+                .SelectOneAsync(p => p.Channel.Number, p => p.Channel.Number == request.ChannelNumber);
+
+            foreach (Playout playout in maybePlayout)
+            {
+                playoutTimeShifter.TimeShift(playout, request.Now, request.Force);
+                await dbContext.SaveChangesAsync(cancellationToken);
+            }
+
+            return Option<BaseError>.None;
+        }
+        catch (Exception ex)
+        {
+            return BaseError.New(ex.Message);
+        }
+    }
+}

ErsatzTV.Application/Playouts/Commands/UpdateExternalJsonPlayoutHandler.cs

@@ -49,9 +49,10 @@ public class
             playout.ProgramSchedulePlayoutType,
             playout.Channel.Name,
             playout.Channel.Number,
+            playout.Channel.ProgressMode,
             playout.ProgramSchedule?.Name ?? string.Empty,
             playout.ExternalJsonFile,
-            Optional(playout.DailyRebuildTime));
+            playout.DailyRebuildTime);
     }
 
     private static Task<Validation<BaseError, Playout>> Validate(

ErsatzTV.Application/Playouts/Commands/UpdateOnDemandCheckpoint.cs

@@ -0,0 +1,4 @@
+namespace ErsatzTV.Application.Playouts;
+
+public record UpdateOnDemandCheckpoint(string ChannelNumber, DateTimeOffset Checkpoint)
+    : IRequest;

ErsatzTV.Application/Playouts/Commands/UpdateOnDemandCheckpointHandler.cs

@@ -0,0 +1,62 @@
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Interfaces.Repositories;
+using ErsatzTV.Infrastructure.Data;
+using ErsatzTV.Infrastructure.Extensions;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Logging;
+
+namespace ErsatzTV.Application.Playouts;
+
+public class UpdateOnDemandCheckpointHandler(
+    IDbContextFactory<TvContext> dbContextFactory,
+    IConfigElementRepository configElementRepository,
+    ILogger<UpdateOnDemandCheckpointHandler> logger)
+    : IRequestHandler<UpdateOnDemandCheckpoint>
+{
+    public async Task Handle(UpdateOnDemandCheckpoint request, CancellationToken cancellationToken)
+    {
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync(cancellationToken);
+
+        Option<Playout> maybePlayout = await dbContext.Playouts
+            .Include(p => p.Channel)
+            .Include(p => p.Items)
+            .SelectOneAsync(p => p.Channel.Number, p => p.Channel.Number == request.ChannelNumber);
+
+        foreach (Playout playout in maybePlayout)
+        {
+            if (playout.Channel.ProgressMode is not ChannelProgressMode.OnDemand)
+            {
+                return;
+            }
+
+            int timeout = await (await configElementRepository.GetValue<int>(ConfigElementKey.FFmpegSegmenterTimeout))
+                .IfNoneAsync(60);
+
+            // don't move checkpoint back in time
+            DateTimeOffset newCheckpoint = request.Checkpoint - TimeSpan.FromSeconds(timeout);
+            if (newCheckpoint > playout.OnDemandCheckpoint)
+            {
+                playout.OnDemandCheckpoint = newCheckpoint;
+            }
+
+            // don't checkpoint before the first item
+            // this could happen if you watch a new playout for less time than the segmenter timeout
+            if (playout.Items.Count > 0)
+            {
+                DateTimeOffset minStart = playout.Items.Min(p => p.StartOffset);
+                if (playout.OnDemandCheckpoint < minStart)
+                {
+                    playout.OnDemandCheckpoint = minStart;
+                }
+            }
+
+            logger.LogDebug(
+                "Updating on demand checkpoint for channel {Number} - {Name} to {Checkpoint}",
+                playout.Channel.Number,
+                playout.Channel.Name,
+                playout.OnDemandCheckpoint);
+
+            await dbContext.SaveChangesAsync(cancellationToken);
+        }
+    }
+}

ErsatzTV.Application/Playouts/Commands/UpdatePlayoutHandler.cs

@@ -41,9 +41,10 @@ public class UpdatePlayoutHandler : IRequestHandler<UpdatePlayout, Either<BaseEr
             playout.ProgramSchedulePlayoutType,
             playout.Channel.Name,
             playout.Channel.Number,
+            playout.Channel.ProgressMode,
             playout.ProgramSchedule?.Name ?? string.Empty,
             playout.ExternalJsonFile,
-            Optional(playout.DailyRebuildTime));
+            playout.DailyRebuildTime);
     }
 
     private static Task<Validation<BaseError, Playout>> Validate(TvContext dbContext, UpdatePlayout request) =>

ErsatzTV.Application/Playouts/PlayoutNameViewModel.cs

@@ -7,6 +7,10 @@ public record PlayoutNameViewModel(
     ProgramSchedulePlayoutType PlayoutType,
     string ChannelName,
     string ChannelNumber,
+    ChannelProgressMode ProgressMode,
     string ScheduleName,
     string ExternalJsonFile,
-    Option<TimeSpan> DailyRebuildTime);
+    TimeSpan? DbDailyRebuildTime)
+{
+    public Option<TimeSpan> DailyRebuildTime => Optional(DbDailyRebuildTime);
+}

ErsatzTV.Application/Playouts/Queries/GetAllPlayoutsHandler.cs

@@ -25,9 +25,10 @@ public class GetAllPlayoutsHandler : IRequestHandler<GetAllPlayouts, List<Playou
                     p.ProgramSchedulePlayoutType,
                     p.Channel.Name,
                     p.Channel.Number,
+                    p.Channel.ProgressMode,
                     p.ProgramScheduleId == null ? string.Empty : p.ProgramSchedule.Name,
                     p.ExternalJsonFile,
-                    Optional(p.DailyRebuildTime)))
+                    p.DailyRebuildTime))
             .ToListAsync(cancellationToken);
     }
 }

ErsatzTV.Application/Streaming/HlsSessionWorker.cs

@@ -6,6 +6,7 @@ using System.Timers;
 using Bugsnag;
 using CliWrap;
 using CliWrap.Buffered;
+using ErsatzTV.Application.Playouts;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.FFmpeg;
@@ -172,6 +173,9 @@ public class HlsSessionWorker : IHlsSessionWorker
             _transcodedUntil = DateTimeOffset.Now;
             PlaylistStart = _transcodedUntil;
 
+            // time shift on-demand playout if needed
+            await _mediator.Send(new TimeShiftOnDemandPlayout(_channelNumber, _transcodedUntil, true), cancellationToken);
+
             bool initialWorkAhead = Volatile.Read(ref _workAheadCount) < await GetWorkAheadLimit();
             _state = initialWorkAhead ? HlsSessionState.SeekAndWorkAhead : HlsSessionState.SeekAndRealtime;
 
@@ -236,7 +240,7 @@ public class HlsSessionWorker : IHlsSessionWorker
             }
             catch (Exception)
             {
-                // do nothing   
+                // do nothing
             }
         }
     }
@@ -524,6 +528,17 @@ public class HlsSessionWorker : IHlsSessionWorker
         }
         finally
         {
+            try
+            {
+                await _mediator.Send(
+                    new UpdateOnDemandCheckpoint(_channelNumber, DateTimeOffset.Now),
+                    CancellationToken.None);
+            }
+            catch (Exception)
+            {
+                // do nothing
+            }
+
             if (!realtime)
             {
                 Interlocked.Decrement(ref _workAheadCount);

ErsatzTV.Application/Streaming/HlsSessionWorkerV2.cs

@@ -4,6 +4,7 @@ using System.Text;
 using System.Timers;
 using CliWrap;
 using CliWrap.Buffered;
+using ErsatzTV.Application.Playouts;
 using ErsatzTV.Core;
 using ErsatzTV.Core.FFmpeg;
 using ErsatzTV.Core.Interfaces.FFmpeg;
@@ -124,6 +125,9 @@ public class HlsSessionWorkerV2 : IHlsSessionWorker
             _transcodedUntil = DateTimeOffset.Now;
             PlaylistStart = _transcodedUntil;
 
+            // time shift on-demand playout if needed
+            await _mediator.Send(new TimeShiftOnDemandPlayout(_channelNumber, _transcodedUntil, true), cancellationToken);
+
             // start concat/segmenter process
             // other transcode processes will be started by incoming requests from concat/segmenter process
 
@@ -171,6 +175,17 @@ public class HlsSessionWorkerV2 : IHlsSessionWorker
                 _timer.Elapsed -= CancelRun;
             }
 
+            try
+            {
+                await _mediator.Send(
+                    new UpdateOnDemandCheckpoint(_channelNumber, DateTimeOffset.Now),
+                    CancellationToken.None);
+            }
+            catch (Exception)
+            {
+                // do nothing
+            }
+
             try
             {
                 _localFileSystem.EmptyFolder(Path.Combine(FileSystemLayout.TranscodeFolder, _channelNumber));
@@ -192,7 +207,7 @@ public class HlsSessionWorkerV2 : IHlsSessionWorker
             }
             catch (Exception)
             {
-                // do nothing   
+                // do nothing
             }
         }
     }

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

@@ -10,7 +10,7 @@
       <PackageReference Include="Bugsnag" Version="3.1.0" />
       <PackageReference Include="CliWrap" Version="3.6.6" />
       <PackageReference Include="FluentAssertions" Version="6.12.0" />
-      <PackageReference Include="LanguageExt.Core" Version="4.4.8" />
+      <PackageReference Include="LanguageExt.Core" Version="4.4.9" />
       <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.0" />
       <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.0" />
       <PackageReference Include="Microsoft.Extensions.Logging" Version="8.0.0" />
@@ -24,9 +24,9 @@
       <PackageReference Include="NSubstitute" Version="5.1.0" />
       <PackageReference Include="NUnit" Version="4.1.0" />
       <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
-      <PackageReference Include="Serilog" Version="3.1.1" />
+      <PackageReference Include="Serilog" Version="4.0.0" />
       <PackageReference Include="Serilog.Extensions.Logging" Version="8.0.0" />
-      <PackageReference Include="Serilog.Sinks.Debug" Version="2.0.0" />
+      <PackageReference Include="Serilog.Sinks.Debug" Version="3.0.0" />
     </ItemGroup>
 
     <ItemGroup>

ErsatzTV.Core.Tests/Scheduling/PlayoutBuilderTests.cs

@@ -558,6 +558,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -657,6 +658,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -804,6 +806,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -909,6 +912,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -1023,6 +1027,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -1130,6 +1135,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -1241,6 +1247,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -1357,6 +1364,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -1462,6 +1470,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -1578,6 +1587,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -1705,6 +1715,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -1824,6 +1835,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -1903,6 +1915,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -2118,6 +2131,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -2609,6 +2623,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -2723,6 +2738,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -2837,6 +2853,7 @@ public class PlayoutBuilderTests
                 Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
             ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
             var builder = new PlayoutBuilder(
+                Substitute.For<IPlayoutTimeShifter>(),
                 configRepo,
                 fakeRepository,
                 televisionRepo,
@@ -2946,6 +2963,7 @@ public class PlayoutBuilderTests
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
         ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         var builder = new PlayoutBuilder(
+            Substitute.For<IPlayoutTimeShifter>(),
             configRepo,
             collectionRepo,
             televisionRepo,
@@ -3001,6 +3019,7 @@ public class PlayoutBuilderTests
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
         ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         var builder = new PlayoutBuilder(
+            Substitute.For<IPlayoutTimeShifter>(),
             configRepo,
             collectionRepo,
             televisionRepo,

ErsatzTV.Core.Tests/Scheduling/ScheduleIntegrationTests.cs

@@ -117,6 +117,7 @@ public class ScheduleIntegrationTests
             provider.GetRequiredService<IFallbackMetadataProvider>());
 
         var builder = new PlayoutBuilder(
+            Substitute.For<IPlayoutTimeShifter>(),
             new ConfigElementRepository(factory),
             new MediaCollectionRepository(Substitute.For<IClient>(), searchIndex, factory),
             new TelevisionRepository(factory, provider.GetRequiredService<ILogger<TelevisionRepository>>()),
@@ -287,6 +288,7 @@ public class ScheduleIntegrationTests
         DateTimeOffset finish = start.AddDays(2);
 
         var builder = new PlayoutBuilder(
+            Substitute.For<IPlayoutTimeShifter>(),
             new ConfigElementRepository(factory),
             new MediaCollectionRepository(Substitute.For<IClient>(), Substitute.For<ISearchIndex>(), factory),
             new TelevisionRepository(factory, provider.GetRequiredService<ILogger<TelevisionRepository>>()),

ErsatzTV.Core/Domain/Channel.cs

@@ -28,4 +28,5 @@ public class Channel
     public ChannelSubtitleMode SubtitleMode { get; set; }
     public ChannelMusicVideoCreditsMode MusicVideoCreditsMode { get; set; }
     public string MusicVideoCreditsTemplate { get; set; }
+    public ChannelProgressMode ProgressMode { get; set; }
 }

ErsatzTV.Core/Domain/ChannelProgressMode.cs

@@ -0,0 +1,7 @@
+namespace ErsatzTV.Core.Domain;
+
+public enum ChannelProgressMode
+{
+    Always = 0,
+    OnDemand = 1
+}

ErsatzTV.Core/Domain/Playout.cs

@@ -22,4 +22,5 @@ public class Playout
     public TimeSpan? DailyRebuildTime { get; set; }
     public int? DecoId { get; set; }
     public Deco Deco { get; set; }
+    public DateTimeOffset? OnDemandCheckpoint { get; set; }
 }

ErsatzTV.Core/ErsatzTV.Core.csproj

@@ -12,21 +12,21 @@
       <PackageReference Include="Bugsnag" Version="3.1.0" />
       <PackageReference Include="Destructurama.Attributed" Version="4.0.0" />
       <PackageReference Include="Flurl" Version="4.0.0" />
-      <PackageReference Include="LanguageExt.Core" Version="4.4.8" />
+      <PackageReference Include="LanguageExt.Core" Version="4.4.9" />
       <PackageReference Include="LanguageExt.Transformers" Version="4.4.8" />
-      <PackageReference Include="MediatR" Version="12.2.0" />
+      <PackageReference Include="MediatR" Version="12.3.0" />
       <PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="8.0.0" />
       <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.1" />
       <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.0" />
       <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.1" />
-      <PackageReference Include="Microsoft.IO.RecyclableMemoryStream" Version="3.0.0" />
+      <PackageReference Include="Microsoft.IO.RecyclableMemoryStream" Version="3.0.1" />
       <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.10.48">
         <PrivateAssets>all</PrivateAssets>
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       </PackageReference>
       <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-      <PackageReference Include="Serilog" Version="3.1.1" />
+      <PackageReference Include="Serilog" Version="4.0.0" />
-      <PackageReference Include="Serilog.Sinks.Console" Version="5.0.1" />
+      <PackageReference Include="Serilog.Sinks.Console" Version="6.0.0" />
     </ItemGroup>
     
     <ItemGroup>

ErsatzTV.Core/Interfaces/Scheduling/IPlayoutTimeShifter.cs

@@ -0,0 +1,8 @@
+using ErsatzTV.Core.Domain;
+
+namespace ErsatzTV.Core.Interfaces.Scheduling;
+
+public interface IPlayoutTimeShifter
+{
+    public void TimeShift(Playout playout, DateTimeOffset now, bool force);
+}

ErsatzTV.Core/Scheduling/PlayoutBuilder.cs

@@ -17,6 +17,7 @@ public class PlayoutBuilder : IPlayoutBuilder
 {
     private static readonly Random Random = new();
     private readonly IArtistRepository _artistRepository;
+    private readonly IPlayoutTimeShifter _playoutTimeShifter;
     private readonly IConfigElementRepository _configElementRepository;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly IMediaCollectionRepository _mediaCollectionRepository;
@@ -26,6 +27,7 @@ public class PlayoutBuilder : IPlayoutBuilder
     private ILogger<PlayoutBuilder> _logger;
 
     public PlayoutBuilder(
+        IPlayoutTimeShifter playoutTimeShifter,
         IConfigElementRepository configElementRepository,
         IMediaCollectionRepository mediaCollectionRepository,
         ITelevisionRepository televisionRepository,
@@ -34,6 +36,7 @@ public class PlayoutBuilder : IPlayoutBuilder
         ILocalFileSystem localFileSystem,
         ILogger<PlayoutBuilder> logger)
     {
+        _playoutTimeShifter = playoutTimeShifter;
         _configElementRepository = configElementRepository;
         _mediaCollectionRepository = mediaCollectionRepository;
         _televisionRepository = televisionRepository;
@@ -79,6 +82,12 @@ public class PlayoutBuilder : IPlayoutBuilder
             //     return await Build(playout, mode, parameters with { Start = parameters.Start.AddDays(-2) });
             // }
 
+            // time shift on demand channel if needed
+            if (playout.Channel.ProgressMode is ChannelProgressMode.OnDemand && mode is not PlayoutBuildMode.Reset)
+            {
+                _playoutTimeShifter.TimeShift(playout, parameters.Start, false);
+            }
+
             return await Build(playout, mode, parameters, cancellationToken);
         }
 
@@ -238,6 +247,13 @@ public class PlayoutBuilder : IPlayoutBuilder
         playout.Items.Clear();
         playout.Anchor = null;
         playout.ProgramScheduleAnchors.Clear();
+        playout.OnDemandCheckpoint = null;
+
+        // don't trim start for on demand channels, we want to time shift it all forward
+        if (playout.Channel.ProgressMode is ChannelProgressMode.OnDemand)
+        {
+            TrimStart = false;
+        }
 
         await BuildPlayoutItems(
             playout,
@@ -247,6 +263,12 @@ public class PlayoutBuilder : IPlayoutBuilder
             true,
             cancellationToken);
 
+        // time shift on demand channel if needed
+        if (playout.Channel.ProgressMode is ChannelProgressMode.OnDemand)
+        {
+            _playoutTimeShifter.TimeShift(playout, parameters.Start, false);
+        }
+
         return playout;
     }
 
@@ -391,20 +413,24 @@ public class PlayoutBuilder : IPlayoutBuilder
             playout.Items.RemoveAll(old => old.FinishOffset < trimBefore);
         }
 
-        // check for future items that aren't grouped inside range
+        // on demand channels end up with slightly more than expected due to time shifting from midnight to first build
-        var futureItems = playout.Items.Filter(i => i.StartOffset > trimAfter).ToList();
+        if (playout.Channel.ProgressMode is not ChannelProgressMode.OnDemand)
-        foreach (PlayoutItem futureItem in futureItems)
         {
-            if (playout.Items.All(i => i == futureItem || i.GuideGroup != futureItem.GuideGroup))
+            // check for future items that aren't grouped inside range
+            var futureItems = playout.Items.Filter(i => i.StartOffset > trimAfter).ToList();
+            foreach (PlayoutItem futureItem in futureItems)
             {
-                _logger.LogError(
+                if (playout.Items.All(i => i == futureItem || i.GuideGroup != futureItem.GuideGroup))
-                    "Playout item scheduled for {Time} after hard stop of {HardStop}",
+                {
-                    futureItem.StartOffset,
+                    _logger.LogError(
-                    trimAfter);
+                        "Playout item scheduled for {Time} after hard stop of {HardStop}",
+                        futureItem.StartOffset,
+                        trimAfter);
 
-                // it feels hacky to have to clean up a playlist like this,
+                    // it feels hacky to have to clean up a playlist like this,
-                // so only log the error, and leave the bad data to fail tests
+                    // so only log the error, and leave the bad data to fail tests
-                // playout.Items.Remove(futureItem);
+                    // playout.Items.Remove(futureItem);
+                }
             }
         }
 
@@ -425,6 +451,12 @@ public class PlayoutBuilder : IPlayoutBuilder
             playout.ProgramScheduleAlternates,
             playoutStart);
 
+        // on demand channels do NOT use alternate schedules
+        if (playout.Channel.ProgressMode is ChannelProgressMode.OnDemand)
+        {
+            activeSchedule = playout.ProgramSchedule;
+        }
+
         // _logger.LogDebug("Active schedule is: {Schedule}", activeSchedule.Name);
 
         // random start points are disabled in some scenarios, so ensure it's enabled and active

ErsatzTV.Core/Scheduling/PlayoutTimeShifter.cs

@@ -0,0 +1,90 @@
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Interfaces.FFmpeg;
+using ErsatzTV.Core.Interfaces.Scheduling;
+using Microsoft.Extensions.Logging;
+
+namespace ErsatzTV.Core.Scheduling;
+
+public class PlayoutTimeShifter(IFFmpegSegmenterService segmenterService, ILogger<PlayoutTimeShifter> logger)
+    : IPlayoutTimeShifter
+{
+    public void TimeShift(Playout playout, DateTimeOffset now, bool force)
+    {
+        if (playout.Channel.ProgressMode is not ChannelProgressMode.OnDemand)
+        {
+            return;
+        }
+
+        if (!force && segmenterService.IsActive(playout.Channel.Number))
+        {
+            logger.LogDebug(
+                "Will not time shift on demand playout that is active for channel {Number} - {Name}",
+                playout.Channel.Number,
+                playout.Channel.Name);
+
+            return;
+        }
+
+        if (playout.Items.Count == 0)
+        {
+            logger.LogDebug(
+                "Unable to time shift empty playout for channel {Number} - {Name}",
+                playout.Channel.Number,
+                playout.Channel.Name);
+
+            return;
+        }
+
+        if (playout.OnDemandCheckpoint is null)
+        {
+            logger.LogDebug(
+                "Time shifting unwatched playout for channel {Number} - {Name}",
+                playout.Channel.Number,
+                playout.Channel.Name);
+
+            playout.OnDemandCheckpoint = playout.Items.Min(p => p.StartOffset);
+        }
+
+        TimeSpan toOffset = now - playout.OnDemandCheckpoint.IfNone(now);
+
+        logger.LogDebug(
+            "Time shifting playout for channel {Number} - {Name} forward by {Time}",
+            playout.Channel.Number,
+            playout.Channel.Name,
+            toOffset);
+
+        // time shift items
+        foreach (PlayoutItem playoutItem in playout.Items)
+        {
+            playoutItem.Start += toOffset;
+            playoutItem.Finish += toOffset;
+
+            if (playoutItem.GuideStart.HasValue)
+            {
+                playoutItem.GuideStart += toOffset;
+            }
+
+            if (playoutItem.GuideFinish.HasValue)
+            {
+                playoutItem.GuideFinish += toOffset;
+            }
+        }
+
+        // time shift anchors
+        foreach (PlayoutProgramScheduleAnchor anchor in playout.ProgramScheduleAnchors)
+        {
+            if (anchor.AnchorDate.HasValue)
+            {
+                anchor.AnchorDate += toOffset;
+            }
+        }
+
+        // time shift anchor
+        if (playout.Anchor is not null)
+        {
+            playout.Anchor.NextStart += toOffset;
+        }
+
+        playout.OnDemandCheckpoint = now;
+    }
+}

ErsatzTV.FFmpeg/ErsatzTV.FFmpeg.csproj

@@ -10,7 +10,7 @@
 
     <ItemGroup>
       <PackageReference Include="CliWrap" Version="3.6.6" />
-      <PackageReference Include="LanguageExt.Core" Version="4.4.8" />
+      <PackageReference Include="LanguageExt.Core" Version="4.4.9" />
       <PackageReference Include="Microsoft.Extensions.Caching.Abstractions" Version="8.0.0" />
       <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.1" />
     </ItemGroup>

ErsatzTV.Infrastructure.MySql/ErsatzTV.Infrastructure.MySql.csproj

@@ -16,7 +16,7 @@
     </ItemGroup>
 
     <ItemGroup>
-      <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="8.0.5" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="8.0.7" />
       <PackageReference Include="Pomelo.EntityFrameworkCore.MySql" Version="8.0.2" />
     </ItemGroup>
 

ErsatzTV.Infrastructure.MySql/Migrations/20240716141648_Add_Channel_ProgressMode.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ErsatzTV.Infrastructure.MySql.Migrations
+{
+    /// <inheritdoc />
+    public partial class Add_Channel_ProgressMode : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "ProgressMode",
+                table: "Channel",
+                type: "int",
+                nullable: false,
+                defaultValue: 0);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "ProgressMode",
+                table: "Channel");
+        }
+    }
+}

ErsatzTV.Infrastructure.MySql/Migrations/20240716155846_Add_Playout_OnDemandCheckpoint.cs

@@ -0,0 +1,29 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ErsatzTV.Infrastructure.MySql.Migrations
+{
+    /// <inheritdoc />
+    public partial class Add_Playout_OnDemandCheckpoint : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<DateTimeOffset>(
+                name: "OnDemandCheckpoint",
+                table: "Playout",
+                type: "datetime(6)",
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "OnDemandCheckpoint",
+                table: "Playout");
+        }
+    }
+}

ErsatzTV.Infrastructure.MySql/Migrations/TvContextModelSnapshot.cs

@@ -17,7 +17,7 @@ namespace ErsatzTV.Infrastructure.MySql.Migrations
         {
 #pragma warning disable 612, 618
             modelBuilder
-                .HasAnnotation("ProductVersion", "8.0.5")
+                .HasAnnotation("ProductVersion", "8.0.7")
                 .HasAnnotation("Relational:MaxIdentifierLength", 64);
 
             MySqlModelBuilderExtensions.AutoIncrementColumns(modelBuilder);
@@ -277,6 +277,9 @@ namespace ErsatzTV.Infrastructure.MySql.Migrations
                     b.Property<string>("PreferredSubtitleLanguageCode")
                         .HasColumnType("longtext");
 
+                    b.Property<int>("ProgressMode")
+                        .HasColumnType("int");
+
                     b.Property<int>("StreamingMode")
                         .HasColumnType("int");
 
@@ -1699,6 +1702,9 @@ namespace ErsatzTV.Infrastructure.MySql.Migrations
                     b.Property<string>("ExternalJsonFile")
                         .HasColumnType("longtext");
 
+                    b.Property<DateTimeOffset?>("OnDemandCheckpoint")
+                        .HasColumnType("datetime(6)");
+
                     b.Property<int?>("ProgramScheduleId")
                         .HasColumnType("int");
 

ErsatzTV.Infrastructure.Sqlite/ErsatzTV.Infrastructure.Sqlite.csproj

@@ -13,8 +13,8 @@
 
     <ItemGroup>
       <PackageReference Include="Dapper" Version="2.1.35" />
-      <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="8.0.5" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="8.0.7" />
-      <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.5" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0.7" />
     </ItemGroup>
 
 

ErsatzTV.Infrastructure.Sqlite/Migrations/20240716135729_Add_Channel_ProgressMode.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ErsatzTV.Infrastructure.Sqlite.Migrations
+{
+    /// <inheritdoc />
+    public partial class Add_Channel_ProgressMode : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "ProgressMode",
+                table: "Channel",
+                type: "INTEGER",
+                nullable: false,
+                defaultValue: 0);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "ProgressMode",
+                table: "Channel");
+        }
+    }
+}

ErsatzTV.Infrastructure.Sqlite/Migrations/20240716150019_Add_Playout_OnDemandCheckpoint.cs

@@ -0,0 +1,29 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ErsatzTV.Infrastructure.Sqlite.Migrations
+{
+    /// <inheritdoc />
+    public partial class Add_Playout_OnDemandCheckpoint : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<DateTimeOffset>(
+                name: "OnDemandCheckpoint",
+                table: "Playout",
+                type: "TEXT",
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "OnDemandCheckpoint",
+                table: "Playout");
+        }
+    }
+}

ErsatzTV.Infrastructure.Sqlite/Migrations/TvContextModelSnapshot.cs

@@ -15,7 +15,7 @@ namespace ErsatzTV.Infrastructure.Sqlite.Migrations
         protected override void BuildModel(ModelBuilder modelBuilder)
         {
 #pragma warning disable 612, 618
-            modelBuilder.HasAnnotation("ProductVersion", "8.0.5");
+            modelBuilder.HasAnnotation("ProductVersion", "8.0.7");
 
             modelBuilder.Entity("ErsatzTV.Core.Domain.Actor", b =>
                 {
@@ -264,6 +264,9 @@ namespace ErsatzTV.Infrastructure.Sqlite.Migrations
                     b.Property<string>("PreferredSubtitleLanguageCode")
                         .HasColumnType("TEXT");
 
+                    b.Property<int>("ProgressMode")
+                        .HasColumnType("INTEGER");
+
                     b.Property<int>("StreamingMode")
                         .HasColumnType("INTEGER");
 
@@ -1612,6 +1615,9 @@ namespace ErsatzTV.Infrastructure.Sqlite.Migrations
                     b.Property<string>("ExternalJsonFile")
                         .HasColumnType("TEXT");
 
+                    b.Property<DateTimeOffset?>("OnDemandCheckpoint")
+                        .HasColumnType("TEXT");
+
                     b.Property<int?>("ProgramScheduleId")
                         .HasColumnType("INTEGER");
 

ErsatzTV.Infrastructure/ErsatzTV.Infrastructure.csproj

@@ -13,24 +13,24 @@
       <PackageReference Include="Blurhash.ImageSharp" Version="3.0.0" />
       <PackageReference Include="CliWrap" Version="3.6.6" />
       <PackageReference Include="Dapper" Version="2.1.35" />
-      <PackageReference Include="Elastic.Clients.Elasticsearch" Version="8.13.12" />
+      <PackageReference Include="Elastic.Clients.Elasticsearch" Version="8.14.6" />
-      <PackageReference Include="Jint" Version="3.1.1" />
+      <PackageReference Include="Jint" Version="3.1.5" />
       <PackageReference Include="Lucene.Net" Version="4.8.0-beta00016" />
       <PackageReference Include="Lucene.Net.Analysis.Common" Version="4.8.0-beta00016" />
       <PackageReference Include="Lucene.Net.QueryParser" Version="4.8.0-beta00016" />
-      <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.5" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.7" />
-      <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.5">
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.7">
         <PrivateAssets>all</PrivateAssets>
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       </PackageReference>
-      <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="8.0.5" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="8.0.7" />
       <PackageReference Include="Microsoft.VisualStudio.Threading.Analyzers" Version="17.10.48">
         <PrivateAssets>all</PrivateAssets>
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       </PackageReference>
-      <PackageReference Include="Refit" Version="7.0.0" />
+      <PackageReference Include="Refit" Version="7.1.2" />
-      <PackageReference Include="Refit.Newtonsoft.Json" Version="7.0.0" />
+      <PackageReference Include="Refit.Newtonsoft.Json" Version="7.1.2" />
-      <PackageReference Include="Refit.Xml" Version="7.0.0" />
+      <PackageReference Include="Refit.Xml" Version="7.1.2" />
       <PackageReference Include="Scriban.Signed" Version="5.10.0" />
       <PackageReference Include="TagLibSharp" Version="2.3.0" />
     </ItemGroup>

ErsatzTV.Scanner.Tests/ErsatzTV.Scanner.Tests.csproj

@@ -10,7 +10,7 @@
 
     <ItemGroup>
         <PackageReference Include="FluentAssertions" Version="6.12.0" />
-        <PackageReference Include="LanguageExt.Core" Version="4.4.8" />
+        <PackageReference Include="LanguageExt.Core" Version="4.4.9" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
         <PackageReference Include="NSubstitute" Version="5.1.0" />
         <PackageReference Include="NUnit" Version="4.1.0" />

ErsatzTV.Scanner/ErsatzTV.Scanner.csproj

@@ -22,17 +22,17 @@
     <ItemGroup>
       <PackageReference Include="CliWrap" Version="3.6.6" />
       <PackageReference Include="Humanizer.Core" Version="2.14.1" />
-      <PackageReference Include="LanguageExt.Core" Version="4.4.8" />
+      <PackageReference Include="LanguageExt.Core" Version="4.4.9" />
-      <PackageReference Include="MediatR" Version="12.2.0" />
+      <PackageReference Include="MediatR" Version="12.3.0" />
       <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.0" />
       <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
       <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.1" />
-      <PackageReference Include="Serilog" Version="3.1.1" />
+      <PackageReference Include="Serilog" Version="4.0.0" />
       <PackageReference Include="Serilog.AspNetCore" Version="8.0.1" />
       <PackageReference Include="Serilog.Extensions.Hosting" Version="8.0.0" />
-      <PackageReference Include="Serilog.Formatting.Compact" Version="2.0.0" />
+      <PackageReference Include="Serilog.Formatting.Compact" Version="3.0.0" />
-      <PackageReference Include="Serilog.Sinks.Console" Version="5.0.1" />
+      <PackageReference Include="Serilog.Sinks.Console" Version="6.0.0" />
-      <PackageReference Include="Serilog.Sinks.File" Version="5.0.0" />
+      <PackageReference Include="Serilog.Sinks.File" Version="6.0.0" />
       <PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
     </ItemGroup>
 

ErsatzTV/ErsatzTV.csproj

@@ -16,20 +16,20 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="Blazored.FluentValidation" Version="2.1.0" />
+      <PackageReference Include="Blazored.FluentValidation" Version="2.2.0" />
       <PackageReference Include="Bugsnag.AspNet.Core" Version="3.1.0" />
-      <PackageReference Include="FluentValidation" Version="11.9.1" />
+      <PackageReference Include="FluentValidation" Version="11.9.2" />
       <PackageReference Include="FluentValidation.AspNetCore" Version="11.3.0" />
       <PackageReference Include="Heron.MudCalendar" Version="1.1.2" />
       <PackageReference Include="HtmlSanitizer" Version="8.0.865" />
-      <PackageReference Include="LanguageExt.Core" Version="4.4.8" />
+      <PackageReference Include="LanguageExt.Core" Version="4.4.9" />
       <PackageReference Include="Markdig" Version="0.37.0" />
       <PackageReference Include="MediatR.Courier.DependencyInjection" Version="5.0.0" />
-      <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="8.0.5" />
+      <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="8.0.7" />
-      <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="8.0.5" />
+      <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="8.0.7" />
-      <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="8.0.5" />
+      <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="8.0.7" />
-      <PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="8.0.5" /> 
+      <PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="8.0.7" />
-      <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.5">
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.7">
         <PrivateAssets>all</PrivateAssets>
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       </PackageReference>
@@ -37,12 +37,12 @@
         <PrivateAssets>all</PrivateAssets>
         <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       </PackageReference>
-      <PackageReference Include="MudBlazor" Version="6.19.1" />
+      <PackageReference Include="MudBlazor" Version="6.21.0" />
       <PackageReference Include="NaturalSort.Extension" Version="4.3.0" />
-      <PackageReference Include="Refit.HttpClientFactory" Version="7.0.0" />
+      <PackageReference Include="Refit.HttpClientFactory" Version="7.1.2" />
-      <PackageReference Include="Serilog" Version="3.1.1" />
+      <PackageReference Include="Serilog" Version="4.0.0" />
       <PackageReference Include="Serilog.AspNetCore" Version="8.0.1" />
-      <PackageReference Include="Serilog.Settings.Configuration" Version="8.0.0" />
+      <PackageReference Include="Serilog.Settings.Configuration" Version="8.0.2" />
       <PackageReference Include="System.IO.FileSystem.Primitives" Version="4.3.0" />
       <PackageReference Include="System.Text.Encoding.Extensions" Version="4.3.0" />
       <PackageReference Include="System.Runtime.Handles" Version="4.3.0" />

ErsatzTV/Pages/ChannelEditor.razor

@@ -30,6 +30,10 @@
                     <MudTextField Class="mt-3" Label="Name" @bind-Value="_model.Name" For="@(() => _model.Name)"/>
                     <MudTextField Class="mt-3" Label="Group" @bind-Value="_model.Group" For="@(() => _model.Group)"/>
                     <MudTextField Class="mt-3" Label="Categories" @bind-Value="_model.Categories" For="@(() => _model.Categories)" Placeholder="Comma-separated list of categories"/>
+                    <MudSelect Class="mt-3" Label="Progress Mode" @bind-Value="_model.ProgressMode" For="@(() => _model.ProgressMode)">
+                        <MudSelectItem Value="@(ChannelProgressMode.Always)">Always</MudSelectItem>
+                        <MudSelectItem Value="@(ChannelProgressMode.OnDemand)">On Demand</MudSelectItem>
+                    </MudSelect>
                     <MudSelect Class="mt-3" Label="Streaming Mode" @bind-Value="_model.StreamingMode" For="@(() => _model.StreamingMode)">
                         <MudSelectItem Value="@(StreamingMode.TransportStreamHybrid)">MPEG-TS</MudSelectItem>
                         <MudSelectItem Value="@(StreamingMode.TransportStream)">MPEG-TS (Legacy)</MudSelectItem>
@@ -180,6 +184,7 @@
                     _model.Number = channelViewModel.Number;
                     _model.FFmpegProfileId = channelViewModel.FFmpegProfileId;
                     _model.Logo = channelViewModel.Logo;
+                    _model.ProgressMode = channelViewModel.ProgressMode;
                     _model.StreamingMode = channelViewModel.StreamingMode;
                     _model.PreferredAudioLanguageCode = channelViewModel.PreferredAudioLanguageCode;
                     _model.PreferredAudioTitle = channelViewModel.PreferredAudioTitle;

ErsatzTV/Pages/Playouts.razor

@@ -81,12 +81,24 @@
                     </div>
                     @if (context.PlayoutType == ProgramSchedulePlayoutType.Flood)
                     {
-                        <MudTooltip Text="Edit Alternate Schedules">
+                        if (context.ProgressMode is ChannelProgressMode.OnDemand)
-                            <MudIconButton Icon="@Icons.Material.Filled.EditCalendar"
+                        {
-                                           Disabled="@EntityLocker.IsPlayoutLocked(context.PlayoutId)"
+                            <MudTooltip Text="Alternate Schedules are not supported with On Demand progress">
-                                           Href="@($"playouts/{context.PlayoutId}/alternate-schedules")">
+                                <MudIconButton Icon="@Icons.Material.Filled.EditCalendar"
-                            </MudIconButton>
+                                               Disabled="true">
-                        </MudTooltip>
+                                </MudIconButton>
+                            </MudTooltip>
+                        }
+                        else
+                        {
+                            <MudTooltip Text="Edit Alternate Schedules">
+                                <MudIconButton Icon="@Icons.Material.Filled.EditCalendar"
+                                               Disabled="@EntityLocker.IsPlayoutLocked(context.PlayoutId)"
+                                               Href="@($"playouts/{context.PlayoutId}/alternate-schedules")">
+                                </MudIconButton>
+                            </MudTooltip>
+                        }
+
                         <MudTooltip Text="Reset Playout">
                             <MudIconButton Icon="@Icons.Material.Filled.Refresh"
                                            Disabled="@EntityLocker.IsPlayoutLocked(context.PlayoutId)"

ErsatzTV/Services/WorkerService.cs

@@ -71,6 +71,9 @@ public class WorkerService : BackgroundService
                                     buildPlayout.PlayoutId,
                                     error.Value));
                             break;
+                        case TimeShiftOnDemandPlayout timeShiftOnDemandPlayout:
+                            await mediator.Send(timeShiftOnDemandPlayout, stoppingToken);
+                            break;
                         case DeleteOrphanedArtwork deleteOrphanedArtwork:
                             await mediator.Send(deleteOrphanedArtwork, stoppingToken);
                             break;

ErsatzTV/Startup.cs

@@ -1,5 +1,6 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
+using System.Net.Security;
 using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Text;
@@ -654,6 +655,7 @@ public class Startup
         services.AddScoped<IBlockPlayoutBuilder, BlockPlayoutBuilder>();
         services.AddScoped<IBlockPlayoutPreviewBuilder, BlockPlayoutPreviewBuilder>();
         services.AddScoped<IExternalJsonPlayoutBuilder, ExternalJsonPlayoutBuilder>();
+        services.AddScoped<IPlayoutTimeShifter, PlayoutTimeShifter>();
         services.AddScoped<IImageCache, ImageCache>();
         services.AddScoped<ILocalFileSystem, LocalFileSystem>();
         services.AddScoped<IPlexServerApiClient, PlexServerApiClient>();

ErsatzTV/ViewModels/ChannelEditViewModel.cs

@@ -15,6 +15,7 @@ public class ChannelEditViewModel
     public string PreferredAudioLanguageCode { get; set; }
     public string PreferredAudioTitle { get; set; }
     public string Logo { get; set; }
+    public ChannelProgressMode ProgressMode { get; set; }
     public StreamingMode StreamingMode { get; set; }
     public int? WatermarkId { get; set; }
     public int? FallbackFillerId { get; set; }
@@ -41,6 +42,7 @@ public class ChannelEditViewModel
             Logo,
             PreferredAudioLanguageCode,
             PreferredAudioTitle,
+            ProgressMode,
             StreamingMode,
             WatermarkId,
             FallbackFillerId,
@@ -59,6 +61,7 @@ public class ChannelEditViewModel
             Logo,
             PreferredAudioLanguageCode,
             PreferredAudioTitle,
+            ProgressMode,
             StreamingMode,
             WatermarkId,
             FallbackFillerId,