add preferred language (#109)

* add explicit warning for zero/invalid duration media items

* set dateadded on plex media versions

* add media stream table

* save local media streams to db

* save plex media streams to db

* add preferred language settings (no validation)

* use preferred language if possible

* code cleanup

* proper language code validation

* force scan of all libraries to pull in media streams

ErsatzTV.Application/Channels/ChannelViewModel.cs

@@ -8,5 +8,6 @@ namespace ErsatzTV.Application.Channels
         string Name,
         int FFmpegProfileId,
         string Logo,
+        string PreferredLanguageCode,
         StreamingMode StreamingMode);
 }

ErsatzTV.Application/Channels/Commands/CreateChannel.cs

@@ -11,5 +11,6 @@ namespace ErsatzTV.Application.Channels.Commands
         string Number,
         int FFmpegProfileId,
         string Logo,
+        string PreferredLanguageCode,
         StreamingMode StreamingMode) : IRequest<Either<BaseError, ChannelViewModel>>;
 }

ErsatzTV.Application/Channels/Commands/CreateChannelHandler.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
 using System.Text.RegularExpressions;
 using System.Threading;
 using System.Threading.Tasks;
@@ -9,6 +11,7 @@ using ErsatzTV.Core.Interfaces.Repositories;
 using LanguageExt;
 using MediatR;
 using static ErsatzTV.Application.Channels.Mapper;
+using static LanguageExt.Prelude;
 
 namespace ErsatzTV.Application.Channels.Commands
 {
@@ -36,9 +39,10 @@ namespace ErsatzTV.Application.Channels.Commands
             _channelRepository.Add(c).Map(ProjectToViewModel);
 
         private async Task<Validation<BaseError, Channel>> Validate(CreateChannel request) =>
-            (ValidateName(request), await ValidateNumber(request), await FFmpegProfileMustExist(request))
+            (ValidateName(request), await ValidateNumber(request), await FFmpegProfileMustExist(request),
+                ValidatePreferredLanguage(request))
             .Apply(
-                (name, number, ffmpegProfileId) =>
+                (name, number, ffmpegProfileId, preferredLanguageCode) =>
                 {
                     var artwork = new List<Artwork>();
                     if (!string.IsNullOrWhiteSpace(request.Logo))
@@ -59,7 +63,8 @@ namespace ErsatzTV.Application.Channels.Commands
                         Number = number,
                         FFmpegProfileId = ffmpegProfileId,
                         StreamingMode = request.StreamingMode,
-                        Artwork = artwork
+                        Artwork = artwork,
+                        PreferredLanguageCode = preferredLanguageCode
                     };
                 });
 
@@ -67,6 +72,14 @@ namespace ErsatzTV.Application.Channels.Commands
             createChannel.NotEmpty(c => c.Name)
                 .Bind(_ => createChannel.NotLongerThan(50)(c => c.Name));
 
+        private Validation<BaseError, string> ValidatePreferredLanguage(CreateChannel createChannel) =>
+            Optional(createChannel.PreferredLanguageCode)
+                .Filter(
+                    lc => string.IsNullOrWhiteSpace(lc) || CultureInfo.GetCultures(CultureTypes.NeutralCultures).Any(
+                        ci => string.Equals(ci.ThreeLetterISOLanguageName, lc, StringComparison.OrdinalIgnoreCase)))
+                .ToValidation<BaseError>("Preferred language code is invalid");
+
+
         private async Task<Validation<BaseError, string>> ValidateNumber(CreateChannel createChannel)
         {
             Option<Channel> maybeExistingChannel = await _channelRepository.GetByNumber(createChannel.Number);

ErsatzTV.Application/Channels/Commands/UpdateChannel.cs

@@ -12,5 +12,6 @@ namespace ErsatzTV.Application.Channels.Commands
         string Number,
         int FFmpegProfileId,
         string Logo,
+        string PreferredLanguageCode,
         StreamingMode StreamingMode) : IRequest<Either<BaseError, ChannelViewModel>>;
 }

ErsatzTV.Application/Channels/Commands/UpdateChannelHandler.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Text.RegularExpressions;
 using System.Threading;
@@ -32,6 +33,7 @@ namespace ErsatzTV.Application.Channels.Commands
             c.Name = update.Name;
             c.Number = update.Number;
             c.FFmpegProfileId = update.FFmpegProfileId;
+            c.PreferredLanguageCode = update.PreferredLanguageCode;
 
             if (!string.IsNullOrWhiteSpace(update.Logo))
             {
@@ -65,8 +67,9 @@ namespace ErsatzTV.Application.Channels.Commands
         }
 
         private async Task<Validation<BaseError, Channel>> Validate(UpdateChannel request) =>
-            (await ChannelMustExist(request), ValidateName(request), await ValidateNumber(request))
+            (await ChannelMustExist(request), ValidateName(request), await ValidateNumber(request),
-            .Apply((channelToUpdate, _, _) => channelToUpdate);
+                ValidatePreferredLanguage(request))
+            .Apply((channelToUpdate, _, _, _) => channelToUpdate);
 
         private Task<Validation<BaseError, Channel>> ChannelMustExist(UpdateChannel updateChannel) =>
             _channelRepository.Get(updateChannel.ChannelId)
@@ -92,5 +95,12 @@ namespace ErsatzTV.Application.Channels.Commands
 
             return BaseError.New("Channel number must be unique");
         }
+
+        private Validation<BaseError, string> ValidatePreferredLanguage(UpdateChannel updateChannel) =>
+            Optional(updateChannel.PreferredLanguageCode)
+                .Filter(
+                    lc => string.IsNullOrWhiteSpace(lc) || CultureInfo.GetCultures(CultureTypes.NeutralCultures).Any(
+                        ci => string.Equals(ci.ThreeLetterISOLanguageName, lc, StringComparison.OrdinalIgnoreCase)))
+                .ToValidation<BaseError>("Preferred language code is invalid");
     }
 }

ErsatzTV.Application/Channels/Mapper.cs

@@ -13,6 +13,7 @@ namespace ErsatzTV.Application.Channels
                 channel.Name,
                 channel.FFmpegProfileId,
                 GetLogo(channel),
+                channel.PreferredLanguageCode,
                 channel.StreamingMode);
 
         private static string GetLogo(Channel channel) =>

ErsatzTV.Application/FFmpegProfiles/Commands/UpdateFFmpegSettingsHandler.cs

@@ -134,6 +134,23 @@ namespace ErsatzTV.Application.FFmpegProfiles.Commands
                 Directory.CreateDirectory(FileSystemLayout.FFmpegReportsFolder);
             }
 
+            await _configElementRepository.Get(ConfigElementKey.FFmpegPreferredLanguageCode).Match(
+                ce =>
+                {
+                    ce.Value = request.Settings.PreferredLanguageCode;
+                    _configElementRepository.Update(ce);
+                },
+                () =>
+                {
+                    var ce = new ConfigElement
+                    {
+                        Key = ConfigElementKey.FFmpegPreferredLanguageCode.Key,
+                        Value = request.Settings.PreferredLanguageCode
+                    };
+                    _configElementRepository.Add(ce);
+                });
+
+
             return Unit.Default;
         }
     }

ErsatzTV.Application/FFmpegProfiles/FFmpegSettingsViewModel.cs

@@ -5,6 +5,7 @@
         public string FFmpegPath { get; set; }
         public string FFprobePath { get; set; }
         public int DefaultFFmpegProfileId { get; set; }
+        public string PreferredLanguageCode { get; set; }
         public bool SaveReports { get; set; }
     }
 }

ErsatzTV.Application/FFmpegProfiles/Queries/GetFFmpegSettingsHandler.cs

@@ -24,13 +24,16 @@ namespace ErsatzTV.Application.FFmpegProfiles.Queries
                 await _configElementRepository.GetValue<int>(ConfigElementKey.FFmpegDefaultProfileId);
             Option<bool> saveReports =
                 await _configElementRepository.GetValue<bool>(ConfigElementKey.FFmpegSaveReports);
+            Option<string> preferredLanguageCode =
+                await _configElementRepository.GetValue<string>(ConfigElementKey.FFmpegPreferredLanguageCode);
 
             return new FFmpegSettingsViewModel
             {
                 FFmpegPath = ffmpegPath.IfNone(string.Empty),
                 FFprobePath = ffprobePath.IfNone(string.Empty),
                 DefaultFFmpegProfileId = defaultFFmpegProfileId.IfNone(0),
-                SaveReports = saveReports.IfNone(false)
+                SaveReports = saveReports.IfNone(false),
+                PreferredLanguageCode = preferredLanguageCode.IfNone("eng")
             };
         }
     }

ErsatzTV.Application/Streaming/Queries/GetPlayoutItemProcessByChannelNumberHandler.cs

@@ -63,7 +63,7 @@ namespace ErsatzTV.Application.Streaming.Queries
                         .Map(result => result.IfNone(false));
 
                     return Right<BaseError, Process>(
-                        _ffmpegProcessService.ForPlayoutItem(
+                        await _ffmpegProcessService.ForPlayoutItem(
                             ffmpegPath,
                             saveReports,
                             channel,

ErsatzTV.Core.Tests/FFmpeg/FFmpegComplexFilterBuilderTests.cs

@@ -18,7 +18,7 @@ namespace ErsatzTV.Core.Tests.FFmpeg
             {
                 var builder = new FFmpegComplexFilterBuilder();
 
-                Option<FFmpegComplexFilter> result = builder.Build();
+                Option<FFmpegComplexFilter> result = builder.Build(0, 1);
 
                 result.IsNone.Should().BeTrue();
             }
@@ -30,15 +30,15 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                 FFmpegComplexFilterBuilder builder = new FFmpegComplexFilterBuilder()
                     .WithAlignedAudio(duration);
 
-                Option<FFmpegComplexFilter> result = builder.Build();
+                Option<FFmpegComplexFilter> result = builder.Build(0, 1);
 
                 result.IsSome.Should().BeTrue();
                 result.IfSome(
                     filter =>
                     {
-                        filter.ComplexFilter.Should().Be($"[0:a]apad=whole_dur={duration.TotalMilliseconds}ms[a]");
+                        filter.ComplexFilter.Should().Be($"[0:1]apad=whole_dur={duration.TotalMilliseconds}ms[a]");
                         filter.AudioLabel.Should().Be("[a]");
-                        filter.VideoLabel.Should().Be("0:V");
+                        filter.VideoLabel.Should().Be("0:0");
                     });
             }
 
@@ -50,36 +50,36 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     .WithAlignedAudio(duration)
                     .WithDeinterlace(true);
 
-                Option<FFmpegComplexFilter> result = builder.Build();
+                Option<FFmpegComplexFilter> result = builder.Build(0, 1);
 
                 result.IsSome.Should().BeTrue();
                 result.IfSome(
                     filter =>
                     {
                         filter.ComplexFilter.Should().Be(
-                            $"[0:a]apad=whole_dur={duration.TotalMilliseconds}ms[a];[0:V]yadif=1[v]");
+                            $"[0:1]apad=whole_dur={duration.TotalMilliseconds}ms[a];[0:0]yadif=1[v]");
                         filter.AudioLabel.Should().Be("[a]");
                         filter.VideoLabel.Should().Be("[v]");
                     });
             }
 
             [Test]
-            [TestCase(true, false, false, "[0:V]yadif=1[v]", "[v]")]
+            [TestCase(true, false, false, "[0:0]yadif=1[v]", "[v]")]
-            [TestCase(true, true, false, "[0:V]yadif=1,scale=1920:1000:flags=fast_bilinear,setsar=1[v]", "[v]")]
+            [TestCase(true, true, false, "[0:0]yadif=1,scale=1920:1000:flags=fast_bilinear,setsar=1[v]", "[v]")]
-            [TestCase(true, false, true, "[0:V]yadif=1,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2[v]", "[v]")]
+            [TestCase(true, false, true, "[0:0]yadif=1,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2[v]", "[v]")]
             [TestCase(
                 true,
                 true,
                 true,
-                "[0:V]yadif=1,scale=1920:1000:flags=fast_bilinear,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2[v]",
+                "[0:0]yadif=1,scale=1920:1000:flags=fast_bilinear,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2[v]",
                 "[v]")]
-            [TestCase(false, true, false, "[0:V]scale=1920:1000:flags=fast_bilinear,setsar=1[v]", "[v]")]
+            [TestCase(false, true, false, "[0:0]scale=1920:1000:flags=fast_bilinear,setsar=1[v]", "[v]")]
-            [TestCase(false, false, true, "[0:V]setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2[v]", "[v]")]
+            [TestCase(false, false, true, "[0:0]setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2[v]", "[v]")]
             [TestCase(
                 false,
                 true,
                 true,
-                "[0:V]scale=1920:1000:flags=fast_bilinear,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2[v]",
+                "[0:0]scale=1920:1000:flags=fast_bilinear,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2[v]",
                 "[v]")]
             public void Should_Return_Software_Video_Filter(
                 bool deinterlace,
@@ -101,55 +101,55 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     builder = builder.WithBlackBars(new Resolution { Width = 1920, Height = 1080 });
                 }
 
-                Option<FFmpegComplexFilter> result = builder.Build();
+                Option<FFmpegComplexFilter> result = builder.Build(0, 1);
 
                 result.IsSome.Should().BeTrue();
                 result.IfSome(
                     filter =>
                     {
                         filter.ComplexFilter.Should().Be(expectedVideoFilter);
-                        filter.AudioLabel.Should().Be("0:a");
+                        filter.AudioLabel.Should().Be("0:1");
                         filter.VideoLabel.Should().Be(expectedVideoLabel);
                     });
             }
 
             [Test]
-            [TestCase(true, false, false, "[0:V]deinterlace_qsv[v]", "[v]")]
+            [TestCase(true, false, false, "[0:0]deinterlace_qsv[v]", "[v]")]
             [TestCase(
                 true,
                 true,
                 false,
-                "[0:V]deinterlace_qsv,scale_qsv=w=1920:h=1000,hwdownload,format=nv12,setsar=1,hwupload=extra_hw_frames=64[v]",
+                "[0:0]deinterlace_qsv,scale_qsv=w=1920:h=1000,hwdownload,format=nv12,setsar=1,hwupload=extra_hw_frames=64[v]",
                 "[v]")]
             [TestCase(
                 true,
                 false,
                 true,
-                "[0:V]deinterlace_qsv,hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload=extra_hw_frames=64[v]",
+                "[0:0]deinterlace_qsv,hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload=extra_hw_frames=64[v]",
                 "[v]")]
             [TestCase(
                 true,
                 true,
                 true,
-                "[0:V]deinterlace_qsv,scale_qsv=w=1920:h=1000,hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload=extra_hw_frames=64[v]",
+                "[0:0]deinterlace_qsv,scale_qsv=w=1920:h=1000,hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload=extra_hw_frames=64[v]",
                 "[v]")]
             [TestCase(
                 false,
                 true,
                 false,
-                "[0:V]scale_qsv=w=1920:h=1000,hwdownload,format=nv12,setsar=1,hwupload=extra_hw_frames=64[v]",
+                "[0:0]scale_qsv=w=1920:h=1000,hwdownload,format=nv12,setsar=1,hwupload=extra_hw_frames=64[v]",
                 "[v]")]
             [TestCase(
                 false,
                 false,
                 true,
-                "[0:V]hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload=extra_hw_frames=64[v]",
+                "[0:0]hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload=extra_hw_frames=64[v]",
                 "[v]")]
             [TestCase(
                 false,
                 true,
                 true,
-                "[0:V]scale_qsv=w=1920:h=1000,hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload=extra_hw_frames=64[v]",
+                "[0:0]scale_qsv=w=1920:h=1000,hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload=extra_hw_frames=64[v]",
                 "[v]")]
             public void Should_Return_QSV_Video_Filter(
                 bool deinterlace,
@@ -172,14 +172,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     builder = builder.WithBlackBars(new Resolution { Width = 1920, Height = 1080 });
                 }
 
-                Option<FFmpegComplexFilter> result = builder.Build();
+                Option<FFmpegComplexFilter> result = builder.Build(0, 1);
 
                 result.IsSome.Should().BeTrue();
                 result.IfSome(
                     filter =>
                     {
                         filter.ComplexFilter.Should().Be(expectedVideoFilter);
-                        filter.AudioLabel.Should().Be("0:a");
+                        filter.AudioLabel.Should().Be("0:1");
                         filter.VideoLabel.Should().Be(expectedVideoLabel);
                     });
             }
@@ -209,37 +209,37 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                 true,
                 true,
                 false,
-                "[0:V]scale_npp=1920:1000,hwdownload,format=nv12,setsar=1,hwupload[v]",
+                "[0:0]scale_npp=1920:1000,hwdownload,format=nv12,setsar=1,hwupload[v]",
                 "[v]")]
             [TestCase(
                 true,
                 false,
                 true,
-                "[0:V]hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
+                "[0:0]hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
                 "[v]")]
             [TestCase(
                 true,
                 true,
                 true,
-                "[0:V]scale_npp=1920:1000,hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
+                "[0:0]scale_npp=1920:1000,hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
                 "[v]")]
             [TestCase(
                 false,
                 true,
                 false,
-                "[0:V]scale_npp=1920:1000,hwdownload,format=nv12,setsar=1,hwupload[v]",
+                "[0:0]scale_npp=1920:1000,hwdownload,format=nv12,setsar=1,hwupload[v]",
                 "[v]")]
             [TestCase(
                 false,
                 false,
                 true,
-                "[0:V]hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
+                "[0:0]hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
                 "[v]")]
             [TestCase(
                 false,
                 true,
                 true,
-                "[0:V]scale_npp=1920:1000,hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
+                "[0:0]scale_npp=1920:1000,hwdownload,format=nv12,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
                 "[v]")]
             public void Should_Return_NVENC_Video_Filter(
                 bool deinterlace,
@@ -262,104 +262,104 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     builder = builder.WithBlackBars(new Resolution { Width = 1920, Height = 1080 });
                 }
 
-                Option<FFmpegComplexFilter> result = builder.Build();
+                Option<FFmpegComplexFilter> result = builder.Build(0, 1);
 
                 result.IsSome.Should().BeTrue();
                 result.IfSome(
                     filter =>
                     {
                         filter.ComplexFilter.Should().Be(expectedVideoFilter);
-                        filter.AudioLabel.Should().Be("0:a");
+                        filter.AudioLabel.Should().Be("0:1");
                         filter.VideoLabel.Should().Be(expectedVideoLabel);
                     });
             }
 
             [Test]
-            [TestCase("h264", true, false, false, "[0:V]deinterlace_vaapi[v]", "[v]")]
+            [TestCase("h264", true, false, false, "[0:0]deinterlace_vaapi[v]", "[v]")]
             [TestCase(
                 "h264",
                 true,
                 true,
                 false,
-                "[0:V]deinterlace_vaapi,scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,hwupload[v]",
+                "[0:0]deinterlace_vaapi,scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,hwupload[v]",
                 "[v]")]
             [TestCase(
                 "h264",
                 true,
                 false,
                 true,
-                "[0:V]deinterlace_vaapi,hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
+                "[0:0]deinterlace_vaapi,hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
                 "[v]")]
             [TestCase(
                 "h264",
                 true,
                 true,
                 true,
-                "[0:V]deinterlace_vaapi,scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
+                "[0:0]deinterlace_vaapi,scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
                 "[v]")]
             [TestCase(
                 "h264",
                 false,
                 true,
                 false,
-                "[0:V]scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,hwupload[v]",
+                "[0:0]scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,hwupload[v]",
                 "[v]")]
             [TestCase(
                 "h264",
                 false,
                 false,
                 true,
-                "[0:V]hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
+                "[0:0]hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
                 "[v]")]
             [TestCase(
                 "h264",
                 false,
                 true,
                 true,
-                "[0:V]scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
+                "[0:0]scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
                 "[v]")]
-            [TestCase("mpeg4", true, false, false, "[0:V]hwupload,deinterlace_vaapi[v]", "[v]")]
+            [TestCase("mpeg4", true, false, false, "[0:0]hwupload,deinterlace_vaapi[v]", "[v]")]
             [TestCase(
                 "mpeg4",
                 true,
                 true,
                 false,
-                "[0:V]hwupload,deinterlace_vaapi,scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,hwupload[v]",
+                "[0:0]hwupload,deinterlace_vaapi,scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,hwupload[v]",
                 "[v]")]
             [TestCase(
                 "mpeg4",
                 true,
                 false,
                 true,
-                "[0:V]hwupload,deinterlace_vaapi,hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
+                "[0:0]hwupload,deinterlace_vaapi,hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
                 "[v]")]
             [TestCase(
                 "mpeg4",
                 true,
                 true,
                 true,
-                "[0:V]hwupload,deinterlace_vaapi,scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
+                "[0:0]hwupload,deinterlace_vaapi,scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
                 "[v]")]
             [TestCase(
                 "mpeg4",
                 false,
                 true,
                 false,
-                "[0:V]hwupload,scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,hwupload[v]",
+                "[0:0]hwupload,scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,hwupload[v]",
                 "[v]")]
             [TestCase(
                 "mpeg4",
                 false,
                 false,
                 true,
-                "[0:V]setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
+                "[0:0]setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
                 "[v]")]
             [TestCase(
                 "mpeg4",
                 false,
                 true,
                 true,
-                "[0:V]hwupload,scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
+                "[0:0]hwupload,scale_vaapi=w=1920:h=1000,hwdownload,format=nv12|vaapi,setsar=1,pad=1920:1080:(ow-iw)/2:(oh-ih)/2,hwupload[v]",
                 "[v]")]
             public void Should_Return_VAAPI_Video_Filter(
                 string codec,
@@ -384,14 +384,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     builder = builder.WithBlackBars(new Resolution { Width = 1920, Height = 1080 });
                 }
 
-                Option<FFmpegComplexFilter> result = builder.Build();
+                Option<FFmpegComplexFilter> result = builder.Build(0, 1);
 
                 result.IsSome.Should().BeTrue();
                 result.IfSome(
                     filter =>
                     {
                         filter.ComplexFilter.Should().Be(expectedVideoFilter);
-                        filter.AudioLabel.Should().Be("0:a");
+                        filter.AudioLabel.Should().Be("0:1");
                         filter.VideoLabel.Should().Be(expectedVideoLabel);
                     });
             }

ErsatzTV.Core.Tests/FFmpeg/FFmpegPlaybackSettingsServiceTests.cs

@@ -25,6 +25,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     new MediaVersion(),
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -40,6 +42,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.HttpLiveStreaming,
                     ffmpegProfile,
                     new MediaVersion(),
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -55,6 +59,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     new MediaVersion(),
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -72,6 +78,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.HttpLiveStreaming,
                     ffmpegProfile,
                     new MediaVersion(),
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -89,6 +97,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     new MediaVersion(),
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -104,6 +114,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.HttpLiveStreaming,
                     ffmpegProfile,
                     new MediaVersion(),
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -121,6 +133,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     new MediaVersion(),
+                    new MediaStream(),
+                    new MediaStream(),
                     now,
                     now.AddMinutes(5));
 
@@ -139,6 +153,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.HttpLiveStreaming,
                     ffmpegProfile,
                     new MediaVersion(),
+                    new MediaStream(),
+                    new MediaStream(),
                     now,
                     now.AddMinutes(5));
 
@@ -155,6 +171,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     new MediaVersion(),
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -177,6 +195,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -199,6 +219,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -221,6 +243,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -244,6 +268,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -267,6 +293,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.HttpLiveStreaming,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -290,6 +318,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -315,6 +345,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -337,12 +369,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
 
                 // not anamorphic
                 var version = new MediaVersion
-                    { Width = 1920, Height = 1080, SampleAspectRatio = "1:1", VideoCodec = "mpeg2video" };
+                    { Width = 1920, Height = 1080, SampleAspectRatio = "1:1" };
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream { Codec = "mpeg2video" },
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -365,12 +399,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
 
                 // not anamorphic
                 var version = new MediaVersion
-                    { Width = 1920, Height = 1080, SampleAspectRatio = "1:1", VideoCodec = "mpeg2video" };
+                    { Width = 1920, Height = 1080, SampleAspectRatio = "1:1" };
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.HttpLiveStreaming,
                     ffmpegProfile,
                     version,
+                    new MediaStream { Codec = "mpeg2video" },
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -392,12 +428,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
 
                 // not anamorphic
                 var version = new MediaVersion
-                    { Width = 1920, Height = 1080, SampleAspectRatio = "1:1", VideoCodec = "libx264" };
+                    { Width = 1920, Height = 1080, SampleAspectRatio = "1:1" };
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream { Codec = "libx264" },
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -420,12 +458,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
 
                 // not anamorphic
                 var version = new MediaVersion
-                    { Width = 1920, Height = 1080, SampleAspectRatio = "1:1", VideoCodec = "mpeg2video" };
+                    { Width = 1920, Height = 1080, SampleAspectRatio = "1:1" };
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream { Codec = "mpeg2video" },
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -452,6 +492,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -473,12 +515,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
 
                 // not anamorphic
                 var version = new MediaVersion
-                    { Width = 1920, Height = 1080, SampleAspectRatio = "1:1", VideoCodec = "mpeg2video" };
+                    { Width = 1920, Height = 1080, SampleAspectRatio = "1:1" };
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream { Codec = "mpeg2video" },
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -505,6 +549,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -527,12 +573,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
 
                 // not anamorphic
                 var version = new MediaVersion
-                    { Width = 1920, Height = 1080, SampleAspectRatio = "1:1", VideoCodec = "mpeg2video" };
+                    { Width = 1920, Height = 1080, SampleAspectRatio = "1:1" };
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream { Codec = "mpeg2video" },
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -550,12 +598,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     AudioCodec = "aac"
                 };
 
-                var version = new MediaVersion { AudioCodec = "aac" };
+                var version = new MediaVersion();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream { Codec = "aac" },
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -571,12 +621,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     AudioCodec = "aac"
                 };
 
-                var version = new MediaVersion { AudioCodec = "ac3" };
+                var version = new MediaVersion();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -592,12 +644,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     AudioCodec = "aac"
                 };
 
-                var version = new MediaVersion { AudioCodec = "ac3" };
+                var version = new MediaVersion();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -613,12 +667,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     AudioCodec = "aac"
                 };
 
-                var version = new MediaVersion { AudioCodec = "ac3" };
+                var version = new MediaVersion();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.HttpLiveStreaming,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -634,12 +690,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     AudioBitrate = 2424
                 };
 
-                var version = new MediaVersion { AudioCodec = "ac3" };
+                var version = new MediaVersion();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -655,12 +713,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     AudioBufferSize = 2424
                 };
 
-                var version = new MediaVersion { AudioCodec = "ac3" };
+                var version = new MediaVersion();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -678,12 +738,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     AudioChannels = 6
                 };
 
-                var version = new MediaVersion { AudioCodec = "ac3" };
+                var version = new MediaVersion();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -701,12 +763,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     AudioSampleRate = 48
                 };
 
-                var version = new MediaVersion { AudioCodec = "ac3" };
+                var version = new MediaVersion();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -723,12 +787,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     AudioChannels = 6
                 };
 
-                var version = new MediaVersion { AudioCodec = "ac3" };
+                var version = new MediaVersion();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -745,12 +811,14 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     AudioSampleRate = 48
                 };
 
-                var version = new MediaVersion { AudioCodec = "ac3" };
+                var version = new MediaVersion();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     version,
+                    new MediaStream(),
+                    new MediaStream { Codec = "ac3" },
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 
@@ -775,6 +843,8 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     StreamingMode.TransportStream,
                     ffmpegProfile,
                     new MediaVersion(),
+                    new MediaStream(),
+                    new MediaStream(),
                     DateTimeOffset.Now,
                     DateTimeOffset.Now);
 

ErsatzTV.Core/Domain/Channel.cs

@@ -16,8 +16,7 @@ namespace ErsatzTV.Core.Domain
         public FFmpegProfile FFmpegProfile { get; set; }
         public StreamingMode StreamingMode { get; set; }
         public List<Playout> Playouts { get; set; }
-
         public List<Artwork> Artwork { get; set; }
-        // public SourceMode Mode { get; set; }
+        public string PreferredLanguageCode { get; set; }
     }
 }

ErsatzTV.Core/Domain/ConfigElementKey.cs

@@ -11,6 +11,7 @@
         public static ConfigElementKey FFmpegDefaultProfileId => new("ffmpeg.default_profile_id");
         public static ConfigElementKey FFmpegDefaultResolutionId => new("ffmpeg.default_resolution_id");
         public static ConfigElementKey FFmpegSaveReports => new("ffmpeg.save_reports");
+        public static ConfigElementKey FFmpegPreferredLanguageCode => new("ffmpeg.preferred_language_code");
         public static ConfigElementKey SearchIndexVersion => new("search_index.version");
     }
 }

ErsatzTV.Core/Domain/MediaItem/MediaStream.cs

@@ -0,0 +1,18 @@
+namespace ErsatzTV.Core.Domain
+{
+    public class MediaStream
+    {
+        public int Id { get; set; }
+        public int Index { get; set; }
+        public string Codec { get; set; }
+        public string Profile { get; set; }
+        public MediaStreamKind MediaStreamKind { get; set; }
+        public string Language { get; set; }
+        public int Channels { get; set; }
+        public string Title { get; set; }
+        public bool Default { get; set; }
+        public bool Forced { get; set; }
+        public int MediaVersionId { get; set; }
+        public MediaVersion MediaVersion { get; set; }
+    }
+}

ErsatzTV.Core/Domain/MediaItem/MediaStreamKind.cs

@@ -0,0 +1,9 @@
+namespace ErsatzTV.Core.Domain
+{
+    public enum MediaStreamKind
+    {
+        Video = 1,
+        Audio = 2,
+        Subtitle = 3
+    }
+}

ErsatzTV.Core/Domain/MediaItem/MediaVersion.cs

@@ -8,15 +8,21 @@ namespace ErsatzTV.Core.Domain
     {
         public int Id { get; set; }
         public string Name { get; set; }
-
         public List<MediaFile> MediaFiles { get; set; }
-
+        public List<MediaStream> Streams { get; set; }
         public TimeSpan Duration { get; set; }
         public string SampleAspectRatio { get; set; }
         public string DisplayAspectRatio { get; set; }
+
+        [Obsolete("Use MediaSource instead")]
         public string VideoCodec { get; set; }
+
+        [Obsolete("Use MediaSource instead")]
         public string VideoProfile { get; set; }
+
+        [Obsolete("Use MediaSource instead")]
         public string AudioCodec { get; set; }
+
         public VideoScanKind VideoScanKind { get; set; }
         public DateTime DateAdded { get; set; }
         public DateTime DateUpdated { get; set; }

ErsatzTV.Core/Domain/SourceMode.cs

@@ -1,9 +0,0 @@
-namespace ErsatzTV.Core.Domain
-{
-    public enum SourceMode
-    {
-        Transcode,
-        DirectPlay,
-        DirectPaths
-    }
-}

ErsatzTV.Core/FFmpeg/FFmpegComplexFilterBuilder.cs

@@ -54,12 +54,12 @@ namespace ErsatzTV.Core.FFmpeg
             return this;
         }
 
-        public Option<FFmpegComplexFilter> Build()
+        public Option<FFmpegComplexFilter> Build(int videoStreamIndex, int audioStreamIndex)
         {
             var complexFilter = new StringBuilder();
 
-            var videoLabel = "0:V";
+            var videoLabel = $"0:{videoStreamIndex}";
-            var audioLabel = "0:a";
+            var audioLabel = $"0:{audioStreamIndex}";
 
             HardwareAccelerationKind acceleration = _hardwareAccelerationKind.IfNone(HardwareAccelerationKind.None);
             bool isHardwareDecode = acceleration switch

ErsatzTV.Core/FFmpeg/FFmpegPlaybackSettingsCalculator.cs

@@ -45,6 +45,8 @@ namespace ErsatzTV.Core.FFmpeg
             StreamingMode streamingMode,
             FFmpegProfile ffmpegProfile,
             MediaVersion version,
+            MediaStream videoStream,
+            MediaStream audioStream,
             DateTimeOffset start,
             DateTimeOffset now)
         {
@@ -85,7 +87,7 @@ namespace ErsatzTV.Core.FFmpeg
                     }
 
                     if (result.ScaledSize.IsSome || result.PadToDesiredResolution ||
-                        NeedToNormalizeVideoCodec(ffmpegProfile, version))
+                        NeedToNormalizeVideoCodec(ffmpegProfile, videoStream))
                     {
                         result.VideoCodec = ffmpegProfile.VideoCodec;
                         result.VideoBitrate = ffmpegProfile.VideoBitrate;
@@ -96,7 +98,7 @@ namespace ErsatzTV.Core.FFmpeg
                         result.VideoCodec = "copy";
                     }
 
-                    if (NeedToNormalizeAudioCodec(ffmpegProfile, version))
+                    if (NeedToNormalizeAudioCodec(ffmpegProfile, audioStream))
                     {
                         result.AudioCodec = ffmpegProfile.AudioCodec;
                         result.AudioBitrate = ffmpegProfile.AudioBitrate;
@@ -104,7 +106,11 @@ namespace ErsatzTV.Core.FFmpeg
 
                         if (ffmpegProfile.NormalizeAudio)
                         {
-                            result.AudioChannels = ffmpegProfile.AudioChannels;
+                            if (audioStream.Channels != ffmpegProfile.AudioChannels)
+                            {
+                                result.AudioChannels = ffmpegProfile.AudioChannels;
+                            }
+
                             result.AudioSampleRate = ffmpegProfile.AudioSampleRate;
                             result.AudioDuration = version.Duration;
                         }
@@ -152,11 +158,11 @@ namespace ErsatzTV.Core.FFmpeg
         private static bool IsOddSize(MediaVersion version) =>
             version.Height % 2 == 1 || version.Width % 2 == 1;
 
-        private static bool NeedToNormalizeVideoCodec(FFmpegProfile ffmpegProfile, MediaVersion version) =>
+        private static bool NeedToNormalizeVideoCodec(FFmpegProfile ffmpegProfile, MediaStream videoStream) =>
-            ffmpegProfile.NormalizeVideoCodec && ffmpegProfile.VideoCodec != version.VideoCodec;
+            ffmpegProfile.NormalizeVideoCodec && ffmpegProfile.VideoCodec != videoStream.Codec;
 
-        private static bool NeedToNormalizeAudioCodec(FFmpegProfile ffmpegProfile, MediaVersion version) =>
+        private static bool NeedToNormalizeAudioCodec(FFmpegProfile ffmpegProfile, MediaStream audioStream) =>
-            ffmpegProfile.NormalizeAudioCodec && ffmpegProfile.AudioCodec != version.AudioCodec;
+            ffmpegProfile.NormalizeAudioCodec && ffmpegProfile.AudioCodec != audioStream.Codec;
 
         private static IDisplaySize CalculateScaledSize(FFmpegProfile ffmpegProfile, MediaVersion version)
         {

ErsatzTV.Core/FFmpeg/FFmpegProcessBuilder.cs

@@ -329,12 +329,12 @@ namespace ErsatzTV.Core.FFmpeg
             return this;
         }
 
-        public FFmpegProcessBuilder WithFilterComplex()
+        public FFmpegProcessBuilder WithFilterComplex(int videoStreamIndex, int audioStreamIndex)
         {
-            var videoLabel = "0:V";
+            var videoLabel = $"0:v:{videoStreamIndex}";
-            var audioLabel = "0:a";
+            var audioLabel = $"0:a:{audioStreamIndex}";
 
-            Option<FFmpegComplexFilter> maybeFilter = _complexFilterBuilder.Build();
+            Option<FFmpegComplexFilter> maybeFilter = _complexFilterBuilder.Build(videoStreamIndex, audioStreamIndex);
             maybeFilter.IfSome(
                 filter =>
                 {

ErsatzTV.Core/FFmpeg/FFmpegProcessService.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Diagnostics;
+using System.Threading.Tasks;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.FFmpeg;
 using LanguageExt;
@@ -8,12 +9,18 @@ namespace ErsatzTV.Core.FFmpeg
 {
     public class FFmpegProcessService
     {
+        private readonly IFFmpegStreamSelector _ffmpegStreamSelector;
         private readonly FFmpegPlaybackSettingsCalculator _playbackSettingsCalculator;
 
-        public FFmpegProcessService(FFmpegPlaybackSettingsCalculator ffmpegPlaybackSettingsService) =>
+        public FFmpegProcessService(
+            FFmpegPlaybackSettingsCalculator ffmpegPlaybackSettingsService,
+            IFFmpegStreamSelector ffmpegStreamSelector)
+        {
             _playbackSettingsCalculator = ffmpegPlaybackSettingsService;
+            _ffmpegStreamSelector = ffmpegStreamSelector;
+        }
 
-        public Process ForPlayoutItem(
+        public async Task<Process> ForPlayoutItem(
             string ffmpegPath,
             bool saveReports,
             Channel channel,
@@ -22,10 +29,15 @@ namespace ErsatzTV.Core.FFmpeg
             DateTimeOffset start,
             DateTimeOffset now)
         {
+            MediaStream videoStream = await _ffmpegStreamSelector.SelectVideoStream(channel, version);
+            MediaStream audioStream = await _ffmpegStreamSelector.SelectAudioStream(channel, version);
+
             FFmpegPlaybackSettings playbackSettings = _playbackSettingsCalculator.CalculateSettings(
                 channel.StreamingMode,
                 channel.FFmpegProfile,
                 version,
+                videoStream,
+                audioStream,
                 start,
                 now);
 
@@ -36,7 +48,7 @@ namespace ErsatzTV.Core.FFmpeg
                 .WithFormatFlags(playbackSettings.FormatFlags)
                 .WithRealtimeOutput(playbackSettings.RealtimeOutput)
                 .WithSeek(playbackSettings.StreamSeek)
-                .WithInputCodec(path, playbackSettings.HardwareAcceleration, version.VideoCodec);
+                .WithInputCodec(path, playbackSettings.HardwareAcceleration, videoStream.Codec);
 
             playbackSettings.ScaledSize.Match(
                 scaledSize =>
@@ -51,7 +63,8 @@ namespace ErsatzTV.Core.FFmpeg
                     }
 
                     builder = builder
-                        .WithAlignedAudio(playbackSettings.AudioDuration).WithFilterComplex();
+                        .WithAlignedAudio(playbackSettings.AudioDuration)
+                        .WithFilterComplex(videoStream.Index, audioStream.Index);
                 },
                 () =>
                 {
@@ -61,19 +74,19 @@ namespace ErsatzTV.Core.FFmpeg
                             .WithDeinterlace(playbackSettings.Deinterlace)
                             .WithBlackBars(channel.FFmpegProfile.Resolution)
                             .WithAlignedAudio(playbackSettings.AudioDuration)
-                            .WithFilterComplex();
+                            .WithFilterComplex(videoStream.Index, audioStream.Index);
                     }
                     else if (playbackSettings.Deinterlace)
                     {
                         builder = builder.WithDeinterlace(playbackSettings.Deinterlace)
                             .WithAlignedAudio(playbackSettings.AudioDuration)
-                            .WithFilterComplex();
+                            .WithFilterComplex(videoStream.Index, audioStream.Index);
                     }
                     else
                     {
                         builder = builder
                             .WithAlignedAudio(playbackSettings.AudioDuration)
-                            .WithFilterComplex();
+                            .WithFilterComplex(videoStream.Index, audioStream.Index);
                     }
                 });
 

ErsatzTV.Core/FFmpeg/FFmpegStreamSelector.cs

@@ -0,0 +1,69 @@
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Interfaces.FFmpeg;
+using ErsatzTV.Core.Interfaces.Repositories;
+using LanguageExt;
+using Microsoft.Extensions.Logging;
+
+namespace ErsatzTV.Core.FFmpeg
+{
+    public class FFmpegStreamSelector : IFFmpegStreamSelector
+    {
+        private readonly IConfigElementRepository _configElementRepository;
+        private readonly ILogger<FFmpegStreamSelector> _logger;
+
+        public FFmpegStreamSelector(
+            ILogger<FFmpegStreamSelector> logger,
+            IConfigElementRepository configElementRepository)
+        {
+            _logger = logger;
+            _configElementRepository = configElementRepository;
+        }
+
+        public Task<MediaStream> SelectVideoStream(Channel channel, MediaVersion version) =>
+            version.Streams.First(s => s.MediaStreamKind == MediaStreamKind.Video).AsTask();
+
+        public async Task<MediaStream> SelectAudioStream(Channel channel, MediaVersion version)
+        {
+            var audioStreams = version.Streams.Filter(s => s.MediaStreamKind == MediaStreamKind.Audio).ToList();
+
+            string language = channel.PreferredLanguageCode.ToLowerInvariant();
+            if (string.IsNullOrWhiteSpace(language))
+            {
+                _logger.LogDebug("Channel {Number} has no preferred language code", channel.Number);
+                Option<string> maybeDefaultLanguage = await _configElementRepository.GetValue<string>(
+                    ConfigElementKey.FFmpegPreferredLanguageCode);
+                maybeDefaultLanguage.Match(
+                    lang => language = lang.ToLowerInvariant(),
+                    () =>
+                    {
+                        _logger.LogDebug("FFmpeg has no preferred language code; falling back to {Code}", "eng");
+                        language = "eng";
+                    });
+            }
+
+            var correctLanguage = audioStreams.Filter(
+                s => string.Equals(
+                    s.Language,
+                    language,
+                    StringComparison.InvariantCultureIgnoreCase)).ToList();
+            if (correctLanguage.Any())
+            {
+                _logger.LogDebug(
+                    "Found {Count} audio streams with preferred language code {Code}; selecting stream with most channels",
+                    correctLanguage.Count,
+                    language);
+
+                return correctLanguage.OrderByDescending(s => s.Channels).Head();
+            }
+
+            _logger.LogDebug(
+                "Unable to find audio stream with preferred language code {Code}; selecting stream with most channels",
+                language);
+
+            return audioStreams.OrderByDescending(s => s.Channels).Head();
+        }
+    }
+}

ErsatzTV.Core/Interfaces/FFmpeg/IFFmpegStreamSelector.cs

@@ -0,0 +1,11 @@
+using System.Threading.Tasks;
+using ErsatzTV.Core.Domain;
+
+namespace ErsatzTV.Core.Interfaces.FFmpeg
+{
+    public interface IFFmpegStreamSelector
+    {
+        Task<MediaStream> SelectVideoStream(Channel channel, MediaVersion version);
+        Task<MediaStream> SelectAudioStream(Channel channel, MediaVersion version);
+    }
+}

ErsatzTV.Core/Interfaces/Repositories/IMetadataRepository.cs

@@ -12,8 +12,8 @@ namespace ErsatzTV.Core.Interfaces.Repositories
         Task<bool> RemoveStudio(Studio studio);
         Task<bool> Update(Domain.Metadata metadata);
         Task<bool> Add(Domain.Metadata metadata);
-        Task<bool> UpdateLocalStatistics(MediaVersion mediaVersion);
+        Task<bool> UpdateLocalStatistics(int mediaVersionId, MediaVersion incoming, bool updateVersion = true);
-        Task<bool> UpdatePlexStatistics(MediaVersion mediaVersion);
+        Task<bool> UpdatePlexStatistics(int mediaVersionId, MediaVersion incoming);
         Task<Unit> UpdateArtworkPath(Artwork artwork);
         Task<Unit> AddArtwork(Domain.Metadata metadata, Artwork artwork);
         Task<Unit> RemoveArtwork(Domain.Metadata metadata, ArtworkKind artworkKind);

ErsatzTV.Core/Metadata/LocalFolderScanner.cs

@@ -77,7 +77,7 @@ namespace ErsatzTV.Core.Metadata
 
                 string path = version.MediaFiles.Head().Path;
 
-                if (version.DateUpdated < _localFileSystem.GetLastWriteTime(path))
+                if (version.DateUpdated < _localFileSystem.GetLastWriteTime(path) || !version.Streams.Any())
                 {
                     _logger.LogDebug("Refreshing {Attribute} for {Path}", "Statistics", path);
                     Either<BaseError, bool> refreshResult =

ErsatzTV.Core/Metadata/LocalStatisticsProvider.cs

@@ -44,7 +44,7 @@ namespace ErsatzTV.Core.Metadata
                 return await maybeProbe.Match(
                     async ffprobe =>
                     {
-                        MediaVersion version = ProjectToMediaVersion(ffprobe);
+                        MediaVersion version = ProjectToMediaVersion(filePath, ffprobe);
                         bool result = await ApplyVersionUpdate(mediaItem, version, filePath);
                         return Right<BaseError, bool>(result);
                     },
@@ -68,18 +68,9 @@ namespace ErsatzTV.Core.Metadata
 
             bool durationChange = mediaItemVersion.Duration != version.Duration;
 
-            mediaItemVersion.DateUpdated = _localFileSystem.GetLastWriteTime(filePath);
+            version.DateUpdated = _localFileSystem.GetLastWriteTime(filePath);
-            mediaItemVersion.Duration = version.Duration;
-            mediaItemVersion.AudioCodec = version.AudioCodec;
-            mediaItemVersion.SampleAspectRatio = version.SampleAspectRatio;
-            mediaItemVersion.DisplayAspectRatio = version.DisplayAspectRatio;
-            mediaItemVersion.Width = version.Width;
-            mediaItemVersion.Height = version.Height;
-            mediaItemVersion.VideoCodec = version.VideoCodec;
-            mediaItemVersion.VideoProfile = version.VideoProfile;
-            mediaItemVersion.VideoScanKind = version.VideoScanKind;
 
-            return await _metadataRepository.UpdateLocalStatistics(mediaItemVersion) && durationChange;
+            return await _metadataRepository.UpdateLocalStatistics(mediaItemVersion.Id, version) && durationChange;
         }
 
         private Task<Either<BaseError, FFprobe>> GetProbeOutput(string ffprobePath, string filePath)
@@ -117,7 +108,7 @@ namespace ErsatzTV.Core.Metadata
                 });
         }
 
-        private MediaVersion ProjectToMediaVersion(FFprobe probeOutput) =>
+        private MediaVersion ProjectToMediaVersion(string path, FFprobe probeOutput) =>
             Optional(probeOutput)
                 .Filter(json => json?.format != null && json.streams != null)
                 .ToValidation<BaseError>("Unable to parse ffprobe output")
@@ -125,14 +116,47 @@ namespace ErsatzTV.Core.Metadata
                 .Match(
                     json =>
                     {
-                        var duration = TimeSpan.FromSeconds(double.Parse(json.format.duration));
+                        var version = new MediaVersion
+                            { Name = "Main", DateAdded = DateTime.UtcNow, Streams = new List<MediaStream>() };
 
-                        var version = new MediaVersion { Name = "Main", Duration = duration };
+                        if (double.TryParse(json.format.duration, out double duration))
-
-                        FFprobeStream audioStream = json.streams.FirstOrDefault(s => s.codec_type == "audio");
-                        if (audioStream != null)
                         {
-                            version.AudioCodec = audioStream.codec_name;
+                            var seconds = TimeSpan.FromSeconds(duration);
+                            version.Duration = seconds;
+                        }
+                        else
+                        {
+                            _logger.LogWarning(
+                                "Media item at {Path} has a missing or invalid duration {Duration} and will cause scheduling issues",
+                                path,
+                                json.format.duration);
+                        }
+
+                        foreach (FFprobeStream audioStream in json.streams.Filter(s => s.codec_type == "audio"))
+                        {
+                            var stream = new MediaStream
+                            {
+                                MediaVersionId = version.Id,
+                                MediaStreamKind = MediaStreamKind.Audio,
+                                Index = audioStream.index,
+                                Codec = audioStream.codec_name,
+                                Profile = (audioStream.profile ?? string.Empty).ToLowerInvariant(),
+                                Channels = audioStream.channels
+                            };
+
+                            if (audioStream.disposition is not null)
+                            {
+                                stream.Default = audioStream.disposition.@default == 1;
+                                stream.Forced = audioStream.disposition.forced == 1;
+                            }
+
+                            if (audioStream.tags is not null)
+                            {
+                                stream.Language = audioStream.tags.language;
+                                stream.Title = audioStream.tags.title;
+                            }
+
+                            version.Streams.Add(stream);
                         }
 
                         FFprobeStream videoStream = json.streams.FirstOrDefault(s => s.codec_type == "video");
@@ -142,14 +166,54 @@ namespace ErsatzTV.Core.Metadata
                             version.DisplayAspectRatio = videoStream.display_aspect_ratio;
                             version.Width = videoStream.width;
                             version.Height = videoStream.height;
-                            version.VideoCodec = videoStream.codec_name;
-                            version.VideoProfile = (videoStream.profile ?? string.Empty).ToLowerInvariant();
                             version.VideoScanKind = ScanKindFromFieldOrder(videoStream.field_order);
+
+                            var stream = new MediaStream
+                            {
+                                MediaVersionId = version.Id,
+                                MediaStreamKind = MediaStreamKind.Video,
+                                Index = videoStream.index,
+                                Codec = videoStream.codec_name,
+                                Profile = (videoStream.profile ?? string.Empty).ToLowerInvariant()
+                            };
+
+                            if (videoStream.disposition is not null)
+                            {
+                                stream.Default = videoStream.disposition.@default == 1;
+                                stream.Forced = videoStream.disposition.forced == 1;
+                            }
+
+                            version.Streams.Add(stream);
+                        }
+
+                        foreach (FFprobeStream subtitleStream in json.streams.Filter(s => s.codec_type == "subtitle"))
+                        {
+                            var stream = new MediaStream
+                            {
+                                MediaVersionId = version.Id,
+                                MediaStreamKind = MediaStreamKind.Subtitle,
+                                Index = subtitleStream.index,
+                                Codec = subtitleStream.codec_name
+                            };
+
+                            if (subtitleStream.disposition is not null)
+                            {
+                                stream.Default = subtitleStream.disposition.@default == 1;
+                                stream.Forced = subtitleStream.disposition.forced == 1;
+                            }
+
+                            if (subtitleStream.tags is not null)
+                            {
+                                stream.Language = subtitleStream.tags.language;
+                            }
+
+                            version.Streams.Add(stream);
                         }
 
                         return version;
                     },
-                    _ => new MediaVersion { Name = "Main" });
+                    _ => new MediaVersion
+                        { Name = "Main", DateAdded = DateTime.UtcNow, Streams = new List<MediaStream>() });
 
         private VideoScanKind ScanKindFromFieldOrder(string fieldOrder) =>
             fieldOrder?.ToLowerInvariant() switch
@@ -164,17 +228,24 @@ namespace ErsatzTV.Core.Metadata
 
         public record FFprobeFormat(string duration);
 
+        public record FFprobeDisposition(int @default, int forced);
+
+        public record FFProbeTags(string language, string title);
+
         public record FFprobeStream(
             int index,
             string codec_name,
             string profile,
             string codec_type,
+            int channels,
             int width,
             int height,
             string sample_aspect_ratio,
             string display_aspect_ratio,
             string field_order,
-            string r_frame_rate);
+            string r_frame_rate,
+            FFprobeDisposition disposition,
+            FFProbeTags tags);
         // ReSharper restore InconsistentNaming
     }
 }

ErsatzTV.Core/Plex/PlexMovieLibraryScanner.cs

@@ -105,8 +105,7 @@ namespace ErsatzTV.Core.Plex
             MediaVersion existingVersion = existing.MediaVersions.Head();
             MediaVersion incomingVersion = incoming.MediaVersions.Head();
 
-            if (incomingVersion.DateUpdated > existingVersion.DateUpdated ||
+            if (incomingVersion.DateUpdated > existingVersion.DateUpdated || !existingVersion.Streams.Any())
-                string.IsNullOrWhiteSpace(existingVersion.SampleAspectRatio))
             {
                 Either<BaseError, MediaVersion> maybeStatistics =
                     await _plexServerApiClient.GetStatistics(incoming.Key.Split("/").Last(), connection, token);
@@ -114,11 +113,11 @@ namespace ErsatzTV.Core.Plex
                 await maybeStatistics.Match(
                     async mediaVersion =>
                     {
-                        existingVersion.SampleAspectRatio = mediaVersion.SampleAspectRatio ?? "1:1";
+                        existingVersion.SampleAspectRatio = mediaVersion.SampleAspectRatio;
                         existingVersion.VideoScanKind = mediaVersion.VideoScanKind;
-                        existingVersion.DateUpdated = incomingVersion.DateUpdated;
+                        existingVersion.DateUpdated = mediaVersion.DateUpdated;
 
-                        await _metadataRepository.UpdatePlexStatistics(existingVersion);
+                        await _metadataRepository.UpdatePlexStatistics(existingVersion.Id, mediaVersion);
                     },
                     _ => Task.CompletedTask);
             }

ErsatzTV.Core/Plex/PlexTelevisionLibraryScanner.cs

@@ -301,8 +301,7 @@ namespace ErsatzTV.Core.Plex
             MediaVersion existingVersion = existing.MediaVersions.Head();
             MediaVersion incomingVersion = incoming.MediaVersions.Head();
 
-            if (incomingVersion.DateUpdated > existingVersion.DateUpdated ||
+            if (incomingVersion.DateUpdated > existingVersion.DateUpdated || !existingVersion.Streams.Any())
-                string.IsNullOrWhiteSpace(existingVersion.SampleAspectRatio))
             {
                 Either<BaseError, MediaVersion> maybeStatistics =
                     await _plexServerApiClient.GetStatistics(incoming.Key.Split("/").Last(), connection, token);
@@ -310,11 +309,11 @@ namespace ErsatzTV.Core.Plex
                 await maybeStatistics.Match(
                     async mediaVersion =>
                     {
-                        existingVersion.SampleAspectRatio = mediaVersion.SampleAspectRatio ?? "1:1";
+                        existingVersion.SampleAspectRatio = mediaVersion.SampleAspectRatio;
                         existingVersion.VideoScanKind = mediaVersion.VideoScanKind;
-                        existingVersion.DateUpdated = incomingVersion.DateUpdated;
+                        existingVersion.DateUpdated = mediaVersion.DateUpdated;
 
-                        await _metadataRepository.UpdatePlexStatistics(existingVersion);
+                        await _metadataRepository.UpdatePlexStatistics(existingVersion.Id, mediaVersion);
                     },
                     _ => Task.CompletedTask);
             }

ErsatzTV.Infrastructure/Data/Configurations/MediaItem/MediaStreamConfiguration.cs

@@ -0,0 +1,11 @@
+using ErsatzTV.Core.Domain;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace ErsatzTV.Infrastructure.Data.Configurations
+{
+    public class MediaStreamConfiguration : IEntityTypeConfiguration<MediaStream>
+    {
+        public void Configure(EntityTypeBuilder<MediaStream> builder) => builder.ToTable("MediaStream");
+    }
+}

ErsatzTV.Infrastructure/Data/Configurations/MediaItem/MediaVersionConfiguration.cs

@@ -14,6 +14,11 @@ namespace ErsatzTV.Infrastructure.Data.Configurations
                 .WithOne(f => f.MediaVersion)
                 .HasForeignKey(f => f.MediaVersionId)
                 .OnDelete(DeleteBehavior.Cascade);
+
+            builder.HasMany(v => v.Streams)
+                .WithOne(s => s.MediaVersion)
+                .HasForeignKey(s => s.MediaVersionId)
+                .OnDelete(DeleteBehavior.Cascade);
         }
     }
 }

ErsatzTV.Infrastructure/Data/Repositories/MetadataRepository.cs

@@ -1,11 +1,13 @@
 using System;
 using System.Data;
+using System.Linq;
 using System.Threading.Tasks;
 using Dapper;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Repositories;
 using LanguageExt;
 using Microsoft.EntityFrameworkCore;
+using static LanguageExt.Prelude;
 
 namespace ErsatzTV.Infrastructure.Data.Repositories
 {
@@ -44,15 +46,66 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
             return await dbContext.SaveChangesAsync() > 0;
         }
 
-        public async Task<bool> UpdateLocalStatistics(MediaVersion mediaVersion)
+        public async Task<bool> UpdateLocalStatistics(
+            int mediaVersionId,
+            MediaVersion incoming,
+            bool updateVersion = true)
         {
             await using TvContext dbContext = _dbContextFactory.CreateDbContext();
-            dbContext.Entry(mediaVersion).State = EntityState.Modified;
+            Option<MediaVersion> maybeVersion = await dbContext.MediaVersions
-            return await dbContext.SaveChangesAsync() > 0;
+                .Include(v => v.Streams)
+                .OrderBy(v => v.Id)
+                .SingleOrDefaultAsync(v => v.Id == mediaVersionId)
+                .Map(Optional);
+
+            return await maybeVersion.Match(
+                async existing =>
+                {
+                    if (updateVersion)
+                    {
+                        existing.DateUpdated = incoming.DateUpdated;
+                        existing.Duration = incoming.Duration;
+                        existing.SampleAspectRatio = incoming.SampleAspectRatio;
+                        existing.DisplayAspectRatio = incoming.DisplayAspectRatio;
+                        existing.Width = incoming.Width;
+                        existing.Height = incoming.Height;
+                        existing.VideoScanKind = incoming.VideoScanKind;
+                    }
+
+                    var toAdd = incoming.Streams.Filter(s => existing.Streams.All(es => es.Index != s.Index)).ToList();
+                    var toRemove = existing.Streams.Filter(es => incoming.Streams.All(s => s.Index != es.Index))
+                        .ToList();
+                    var toUpdate = incoming.Streams.Except(toAdd).ToList();
+
+                    // add
+                    existing.Streams.AddRange(toAdd);
+
+                    // remove
+                    existing.Streams.RemoveAll(s => toRemove.Contains(s));
+
+                    // update
+                    foreach (MediaStream incomingStream in toUpdate)
+                    {
+                        MediaStream existingStream = existing.Streams.First(s => s.Index == incomingStream.Index);
+
+                        existingStream.Codec = incomingStream.Codec;
+                        existingStream.Profile = incomingStream.Profile;
+                        existingStream.MediaStreamKind = incomingStream.MediaStreamKind;
+                        existingStream.Language = incomingStream.Language;
+                        existingStream.Channels = incomingStream.Channels;
+                        existingStream.Title = incomingStream.Title;
+                        existingStream.Default = incomingStream.Default;
+                        existingStream.Forced = incomingStream.Forced;
+                    }
+
+                    return await dbContext.SaveChangesAsync() > 0;
+                },
+                () => Task.FromResult(false));
         }
 
-        public Task<bool> UpdatePlexStatistics(MediaVersion mediaVersion) =>
+        public async Task<bool> UpdatePlexStatistics(int mediaVersionId, MediaVersion incoming)
-            _dbConnection.ExecuteAsync(
+        {
+            bool updatedVersion = await _dbConnection.ExecuteAsync(
                 @"UPDATE MediaVersion SET
                   SampleAspectRatio = @SampleAspectRatio,
                   VideoScanKind = @VideoScanKind,
@@ -60,12 +113,15 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                   WHERE Id = @MediaVersionId",
                 new
                 {
-                    mediaVersion.SampleAspectRatio,
+                    incoming.SampleAspectRatio,
-                    mediaVersion.VideoScanKind,
+                    incoming.VideoScanKind,
-                    mediaVersion.DateUpdated,
+                    incoming.DateUpdated,
-                    MediaVersionId = mediaVersion.Id
+                    MediaVersionId = mediaVersionId
                 }).Map(result => result > 0);
 
+            return await UpdateLocalStatistics(mediaVersionId, incoming, false) || updatedVersion;
+        }
+
         public Task<Unit> UpdateArtworkPath(Artwork artwork) =>
             _dbConnection.ExecuteAsync(
                 "UPDATE Artwork SET Path = @Path, DateUpdated = @DateUpdated WHERE Id = @Id",

ErsatzTV.Infrastructure/Data/Repositories/MovieRepository.cs

@@ -64,6 +64,8 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                 .ThenInclude(lp => lp.Library)
                 .Include(i => i.MediaVersions)
                 .ThenInclude(mv => mv.MediaFiles)
+                .Include(i => i.MediaVersions)
+                .ThenInclude(mv => mv.Streams)
                 .OrderBy(i => i.MediaVersions.First().MediaFiles.First().Path)
                 .SingleOrDefaultAsync(i => i.MediaVersions.First().MediaFiles.First().Path == path);
 
@@ -91,6 +93,8 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                 .ThenInclude(mm => mm.Artwork)
                 .Include(i => i.MediaVersions)
                 .ThenInclude(mv => mv.MediaFiles)
+                .Include(i => i.MediaVersions)
+                .ThenInclude(mv => mv.Streams)
                 .Include(i => i.LibraryPath)
                 .ThenInclude(lp => lp.Library)
                 .OrderBy(i => i.Key)
@@ -223,7 +227,8 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                             MediaFiles = new List<MediaFile>
                             {
                                 new() { Path = path }
-                            }
+                            },
+                            Streams = new List<MediaStream>()
                         }
                     }
                 };

ErsatzTV.Infrastructure/Data/Repositories/PlayoutRepository.cs

@@ -57,8 +57,14 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                 .ThenInclude(mi => (mi as Episode).MediaVersions)
                 .ThenInclude(mv => mv.MediaFiles)
                 .Include(i => i.MediaItem)
+                .ThenInclude(mi => (mi as Episode).MediaVersions)
+                .ThenInclude(mv => mv.Streams)
+                .Include(i => i.MediaItem)
                 .ThenInclude(mi => (mi as Movie).MediaVersions)
                 .ThenInclude(mv => mv.MediaFiles)
+                .Include(i => i.MediaItem)
+                .ThenInclude(mi => (mi as Movie).MediaVersions)
+                .ThenInclude(mv => mv.Streams)
                 .AsNoTracking()
                 .SingleOrDefaultAsync()
                 .Map(Optional);

ErsatzTV.Infrastructure/Data/Repositories/TelevisionRepository.cs

@@ -283,6 +283,8 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                 .ThenInclude(em => em.Artwork)
                 .Include(i => i.MediaVersions)
                 .ThenInclude(mv => mv.MediaFiles)
+                .Include(i => i.MediaVersions)
+                .ThenInclude(mv => mv.Streams)
                 .OrderBy(i => i.MediaVersions.First().MediaFiles.First().Path)
                 .SingleOrDefaultAsync(i => i.MediaVersions.First().MediaFiles.First().Path == path);
 
@@ -414,6 +416,8 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                 .ThenInclude(mm => mm.Artwork)
                 .Include(i => i.MediaVersions)
                 .ThenInclude(mv => mv.MediaFiles)
+                .Include(i => i.MediaVersions)
+                .ThenInclude(mv => mv.Streams)
                 .OrderBy(i => i.Key)
                 .SingleOrDefaultAsync(i => i.Key == item.Key);
 
@@ -582,7 +586,8 @@ namespace ErsatzTV.Infrastructure.Data.Repositories
                             MediaFiles = new List<MediaFile>
                             {
                                 new() { Path = path }
-                            }
+                            },
+                            Streams = new List<MediaStream>()
                         }
                     }
                 };

ErsatzTV.Infrastructure/Migrations/20210328153227_Add_MediaStream.cs

@@ -0,0 +1,47 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Add_MediaStream : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                "MediaStream",
+                table => new
+                {
+                    Id = table.Column<int>("INTEGER", nullable: false)
+                        .Annotation("Sqlite:Autoincrement", true),
+                    Index = table.Column<int>("INTEGER", nullable: false),
+                    Codec = table.Column<string>("TEXT", nullable: true),
+                    Profile = table.Column<string>("TEXT", nullable: true),
+                    MediaStreamKind = table.Column<int>("INTEGER", nullable: false),
+                    Language = table.Column<string>("TEXT", nullable: true),
+                    Channels = table.Column<int>("INTEGER", nullable: false),
+                    Title = table.Column<string>("TEXT", nullable: true),
+                    Default = table.Column<bool>("INTEGER", nullable: false),
+                    Forced = table.Column<bool>("INTEGER", nullable: false),
+                    MediaVersionId = table.Column<int>("INTEGER", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_MediaStream", x => x.Id);
+                    table.ForeignKey(
+                        "FK_MediaStream_MediaVersion_MediaVersionId",
+                        x => x.MediaVersionId,
+                        "MediaVersion",
+                        "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                "IX_MediaStream_MediaVersionId",
+                "MediaStream",
+                "MediaVersionId");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder) =>
+            migrationBuilder.DropTable(
+                "MediaStream");
+    }
+}

ErsatzTV.Infrastructure/Migrations/20210328181032_Add_ChannelPreferredLanguageCode.cs

@@ -0,0 +1,19 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Add_ChannelPreferredLanguageCode : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder) =>
+            migrationBuilder.AddColumn<string>(
+                "PreferredLanguageCode",
+                "Channel",
+                "TEXT",
+                nullable: true);
+
+        protected override void Down(MigrationBuilder migrationBuilder) =>
+            migrationBuilder.DropColumn(
+                "PreferredLanguageCode",
+                "Channel");
+    }
+}

ErsatzTV.Infrastructure/Migrations/20210328214310_Reset_LibraryLastScan_MediaStream.cs

@@ -0,0 +1,14 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Reset_LibraryLastScan_MediaStream : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder) =>
+            migrationBuilder.Sql(@"UPDATE Library SET LastScan = '0001-01-01 00:00:00'");
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+        }
+    }
+}

ErsatzTV.Infrastructure/Migrations/TvContextModelSnapshot.cs

@@ -83,6 +83,9 @@ namespace ErsatzTV.Infrastructure.Migrations
                     b.Property<string>("Number")
                         .HasColumnType("TEXT");
 
+                    b.Property<string>("PreferredLanguageCode")
+                        .HasColumnType("TEXT");
+
                     b.Property<int>("StreamingMode")
                         .HasColumnType("INTEGER");
 
@@ -419,6 +422,51 @@ namespace ErsatzTV.Infrastructure.Migrations
                     b.ToTable("MediaSource");
                 });
 
+            modelBuilder.Entity(
+                "ErsatzTV.Core.Domain.MediaStream",
+                b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("Channels")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Codec")
+                        .HasColumnType("TEXT");
+
+                    b.Property<bool>("Default")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<bool>("Forced")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("Index")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Language")
+                        .HasColumnType("TEXT");
+
+                    b.Property<int>("MediaStreamKind")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<int>("MediaVersionId")
+                        .HasColumnType("INTEGER");
+
+                    b.Property<string>("Profile")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("Title")
+                        .HasColumnType("TEXT");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MediaVersionId");
+
+                    b.ToTable("MediaStream");
+                });
+
             modelBuilder.Entity(
                 "ErsatzTV.Core.Domain.MediaVersion",
                 b =>
@@ -1299,6 +1347,19 @@ namespace ErsatzTV.Infrastructure.Migrations
                     b.Navigation("LibraryPath");
                 });
 
+            modelBuilder.Entity(
+                "ErsatzTV.Core.Domain.MediaStream",
+                b =>
+                {
+                    b.HasOne("ErsatzTV.Core.Domain.MediaVersion", "MediaVersion")
+                        .WithMany("Streams")
+                        .HasForeignKey("MediaVersionId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("MediaVersion");
+                });
+
             modelBuilder.Entity(
                 "ErsatzTV.Core.Domain.MediaVersion",
                 b =>
@@ -1822,7 +1883,14 @@ namespace ErsatzTV.Infrastructure.Migrations
 
             modelBuilder.Entity("ErsatzTV.Core.Domain.MediaSource", b => { b.Navigation("Libraries"); });
 
-            modelBuilder.Entity("ErsatzTV.Core.Domain.MediaVersion", b => { b.Navigation("MediaFiles"); });
+            modelBuilder.Entity(
+                "ErsatzTV.Core.Domain.MediaVersion",
+                b =>
+                {
+                    b.Navigation("MediaFiles");
+
+                    b.Navigation("Streams");
+                });
 
             modelBuilder.Entity(
                 "ErsatzTV.Core.Domain.MovieMetadata",

ErsatzTV.Infrastructure/Plex/Models/PlexStreamResponse.cs

@@ -3,7 +3,14 @@
     public class PlexStreamResponse
     {
         public int Id { get; set; }
+        public int Index { get; set; }
+        public bool Default { get; set; }
+        public bool Forced { get; set; }
+        public string LanguageCode { get; set; }
         public int StreamType { get; set; }
+        public string Codec { get; set; }
+        public string Profile { get; set; }
+        public int Channels { get; set; }
         public bool Anamorphic { get; set; }
         public string PixelAspectRatio { get; set; }
         public string ScanType { get; set; }

ErsatzTV.Infrastructure/Plex/PlexServerApiClient.cs

@@ -227,10 +227,8 @@ namespace ErsatzTV.Infrastructure.Plex
                 Duration = TimeSpan.FromMilliseconds(media.Duration),
                 Width = media.Width,
                 Height = media.Height,
-                AudioCodec = media.AudioCodec,
-                VideoCodec = media.VideoCodec,
-                VideoProfile = media.VideoProfile,
                 // specifically omit sample aspect ratio
+                DateAdded = dateAdded,
                 DateUpdated = lastWriteTime,
                 MediaFiles = new List<MediaFile>
                 {
@@ -240,7 +238,8 @@ namespace ErsatzTV.Infrastructure.Plex
                         Key = part.Key,
                         Path = part.File
                     }
-                }
+                },
+                Streams = new List<MediaStream>()
             };
 
             var movie = new PlexMovie
@@ -255,18 +254,72 @@ namespace ErsatzTV.Infrastructure.Plex
 
         private Option<MediaVersion> ProjectToMediaVersion(PlexMetadataResponse response)
         {
-            Option<PlexStreamResponse> maybeStream =
+            List<PlexStreamResponse> streams = response.Media.Head().Part.Head().Stream;
-                response.Media.Head().Part.Head().Stream.Find(s => s.StreamType == 1);
+            DateTime dateUpdated = DateTimeOffset.FromUnixTimeSeconds(response.UpdatedAt).DateTime;
-            return maybeStream.Map(
+            Option<PlexStreamResponse> maybeVideoStream = streams.Find(s => s.StreamType == 1);
-                stream => new MediaVersion
+            return maybeVideoStream.Map(
+                videoStream =>
                 {
-                    SampleAspectRatio = stream.PixelAspectRatio,
+                    var version = new MediaVersion
-                    VideoScanKind = stream.ScanType switch
                     {
-                        "interlaced" => VideoScanKind.Interlaced,
+                        SampleAspectRatio = videoStream.PixelAspectRatio ?? "1:1",
-                        "progressive" => VideoScanKind.Progressive,
+                        VideoScanKind = videoStream.ScanType switch
-                        _ => VideoScanKind.Unknown
+                        {
+                            "interlaced" => VideoScanKind.Interlaced,
+                            "progressive" => VideoScanKind.Progressive,
+                            _ => VideoScanKind.Unknown
+                        },
+                        Streams = new List<MediaStream>(),
+                        DateUpdated = dateUpdated
+                    };
+
+                    version.Streams.Add(
+                        new MediaStream
+                        {
+                            MediaStreamKind = MediaStreamKind.Video,
+                            Index = videoStream.Index,
+                            Codec = videoStream.Codec,
+                            Profile = (videoStream.Profile ?? string.Empty).ToLowerInvariant(),
+                            Default = videoStream.Default,
+                            Language = videoStream.LanguageCode,
+                            Forced = videoStream.Forced
+                        });
+
+                    foreach (PlexStreamResponse audioStream in streams.Filter(s => s.StreamType == 2))
+                    {
+                        var stream = new MediaStream
+                        {
+                            MediaVersionId = version.Id,
+                            MediaStreamKind = MediaStreamKind.Audio,
+                            Index = audioStream.Index,
+                            Codec = audioStream.Codec,
+                            Profile = (audioStream.Profile ?? string.Empty).ToLowerInvariant(),
+                            Channels = audioStream.Channels,
+                            Default = audioStream.Default,
+                            Forced = audioStream.Forced,
+                            Language = audioStream.LanguageCode
+                        };
+
+                        version.Streams.Add(stream);
                     }
+
+                    foreach (PlexStreamResponse subtitleStream in streams.Filter(s => s.StreamType == 3))
+                    {
+                        var stream = new MediaStream
+                        {
+                            MediaVersionId = version.Id,
+                            MediaStreamKind = MediaStreamKind.Subtitle,
+                            Index = subtitleStream.Index,
+                            Codec = subtitleStream.Codec,
+                            Default = subtitleStream.Default,
+                            Forced = subtitleStream.Forced,
+                            Language = subtitleStream.LanguageCode
+                        };
+
+                        version.Streams.Add(stream);
+                    }
+
+                    return version;
                 });
         }
 
@@ -436,10 +489,7 @@ namespace ErsatzTV.Infrastructure.Plex
                 Duration = TimeSpan.FromMilliseconds(media.Duration),
                 Width = media.Width,
                 Height = media.Height,
-                AudioCodec = media.AudioCodec,
+                DateAdded = dateAdded,
-                VideoCodec = media.VideoCodec,
-                VideoProfile = media.VideoProfile,
-                // specifically omit sample aspect ratio
                 DateUpdated = lastWriteTime,
                 MediaFiles = new List<MediaFile>
                 {
@@ -449,7 +499,9 @@ namespace ErsatzTV.Infrastructure.Plex
                         Key = part.Key,
                         Path = part.File
                     }
-                }
+                },
+                // specifically omit stream details
+                Streams = new List<MediaStream>()
             };
 
             var episode = new PlexEpisode

ErsatzTV/Pages/ChannelEditor.razor

@@ -34,6 +34,7 @@
                             <MudSelectItem Value="@profile.Id">@profile.Name</MudSelectItem>
                         }
                     </MudSelect>
+                    <MudTextField Class="mt-3" Label="Preferred Language Code" @bind-Value="_model.PreferredLanguageCode" For="@(() => _model.PreferredLanguageCode)"/>
                     <MudGrid Class="mt-3" Style="align-items: center" Justify="Justify.Center">
                         <MudItem xs="6">
                             <InputFile id="fileInput" OnChange="UploadLogo" hidden/>
@@ -90,6 +91,7 @@
                     _model.FFmpegProfileId = channelViewModel.FFmpegProfileId;
                     _model.Logo = channelViewModel.Logo;
                     _model.StreamingMode = channelViewModel.StreamingMode;
+                    _model.PreferredLanguageCode = channelViewModel.PreferredLanguageCode;
                 },
                 () => NavigationManager.NavigateTo("404"));
         }

ErsatzTV/Pages/Channels.razor

@@ -15,9 +15,10 @@
         <ColGroup>
             <col style="width: 60px;"/>
             <col/>
-            <col style="width: 20%"/>
+            <col style="width: 15%"/>
-            <col style="width: 20%"/>
+            <col style="width: 15%"/>
-            <col style="width: 20%"/>
+            <col style="width: 15%"/>
+            <col style="width: 15%"/>
             <col style="width: 120px;"/>
         </ColGroup>
         <HeaderContent>
@@ -28,7 +29,8 @@
             <MudTh>
                 <MudTableSortLabel SortBy="new Func<ChannelViewModel, object>(x => x.Name)">Name</MudTableSortLabel>
             </MudTh>
-            <MudTh>Streaming Mode</MudTh>
+            <MudTh>Language</MudTh>
+            <MudTh>Mode</MudTh>
             <MudTh>FFmpeg Profile</MudTh>
             <MudTh/>
         </HeaderContent>
@@ -41,7 +43,8 @@
                 }
             </MudTd>
             <MudTd DataLabel="Name">@context.Name</MudTd>
-            <MudTd DataLabel="Streaming Mode">@context.StreamingMode</MudTd>
+            <MudTd DataLabel="Language">@context.PreferredLanguageCode</MudTd>
+            <MudTd DataLabel="Mode">@(context.StreamingMode == StreamingMode.TransportStream ? "TS" : "HLS")</MudTd>
             <MudTd DataLabel="FFmpeg Profile">
                 @if (context.StreamingMode == StreamingMode.TransportStream)
                 {

ErsatzTV/Pages/FFmpeg.razor

@@ -3,6 +3,7 @@
 @using ErsatzTV.Application.FFmpegProfiles.Commands
 @using ErsatzTV.Application.FFmpegProfiles.Queries
 @using Unit = LanguageExt.Unit
+@using System.Globalization
 @inject IDialogService Dialog
 @inject IMediator Mediator
 @inject ILogger<FFmpeg> Logger
@@ -29,6 +30,9 @@
                         }
                     </MudSelect>
                 </MudElement>
+                <MudElement HtmlTag="div" Class="mt-3">
+                    <MudTextField T="string" Label="Preferred Language Code" @bind-Value="_ffmpegSettings.PreferredLanguageCode" Validation="@(new Func<string, string>(ValidateLanguageCode))" Required="true" RequiredError="Preferred Language Code is required!"/>
+                </MudElement>
                 <MudElement HtmlTag="div" Class="mt-3">
                     <MudSwitch T="bool"
                                Label="Save troubleshooting reports to disk"
@@ -133,6 +137,19 @@
 
     private static string ValidatePathExists(string path) => !File.Exists(path) ? "Path does not exist" : null;
 
+    private static string ValidateLanguageCode(string languageCode)
+    {
+        if (string.IsNullOrWhiteSpace(languageCode))
+        {
+            return null;
+        }
+
+        Option<CultureInfo> culture = CultureInfo.GetCultures(CultureTypes.NeutralCultures)
+            .FirstOrDefault(ci => string.Equals(ci.ThreeLetterISOLanguageName, languageCode, StringComparison.OrdinalIgnoreCase));
+
+        return culture.IsNone ? "Preferred language code is invalid" : null;
+    }
+
     private async Task LoadFFmpegProfilesAsync() =>
         _ffmpegProfiles = await Mediator.Send(new GetAllFFmpegProfiles());
 

ErsatzTV/Startup.cs

@@ -179,7 +179,6 @@ namespace ErsatzTV
         private void CustomServices(IServiceCollection services)
         {
             services.AddSingleton<FFmpegPlaybackSettingsCalculator>();
-            services.AddSingleton<FFmpegProcessService>();
             services.AddSingleton<IPlexSecretStore, PlexSecretStore>();
             services.AddSingleton<IPlexTvApiClient, PlexTvApiClient>(); // TODO: does this need to be singleton?
             services.AddSingleton<IEntityLocker, EntityLocker>();
@@ -216,6 +215,8 @@ namespace ErsatzTV
             services.AddScoped<ISearchIndex, SearchIndex>();
             services.AddScoped<IRuntimeInfo, RuntimeInfo>();
             services.AddScoped<IPlexPathReplacementService, PlexPathReplacementService>();
+            services.AddScoped<IFFmpegStreamSelector, FFmpegStreamSelector>();
+            services.AddScoped<FFmpegProcessService>();
 
             services.AddHostedService<PlexService>();
             services.AddHostedService<FFmpegLocatorService>();

ErsatzTV/Validators/ChannelEditViewModelValidator.cs

@@ -1,4 +1,7 @@
-using ErsatzTV.Core.Domain;
+using System;
+using System.Globalization;
+using System.Linq;
+using ErsatzTV.Core.Domain;
 using ErsatzTV.ViewModels;
 using FluentValidation;
 
@@ -13,6 +16,17 @@ namespace ErsatzTV.Validators
 
             RuleFor(x => x.Name).NotEmpty();
             RuleFor(x => x.FFmpegProfileId).GreaterThan(0);
+
+            RuleFor(x => x.PreferredLanguageCode)
+                .Must(
+                    languageCode => CultureInfo.GetCultures(CultureTypes.NeutralCultures)
+                        .Any(
+                            ci => string.Equals(
+                                ci.ThreeLetterISOLanguageName,
+                                languageCode,
+                                StringComparison.OrdinalIgnoreCase)))
+                .When(vm => !string.IsNullOrWhiteSpace(vm.PreferredLanguageCode))
+                .WithMessage("Preferred language code is invalid");
         }
     }
 }

ErsatzTV/ViewModels/ChannelEditViewModel.cs

@@ -9,6 +9,7 @@ namespace ErsatzTV.ViewModels
         public string Name { get; set; }
         public string Number { get; set; }
         public int FFmpegProfileId { get; set; }
+        public string PreferredLanguageCode { get; set; }
         public string Logo { get; set; }
         public StreamingMode StreamingMode { get; set; }
 
@@ -19,6 +20,7 @@ namespace ErsatzTV.ViewModels
                 Number,
                 FFmpegProfileId,
                 Logo,
+                PreferredLanguageCode,
                 StreamingMode);
 
         public CreateChannel ToCreate() =>
@@ -27,6 +29,7 @@ namespace ErsatzTV.ViewModels
                 Number,
                 FFmpegProfileId,
                 Logo,
+                PreferredLanguageCode,
                 StreamingMode);
     }
 }