feat: sync music video subtitles to next engine

ErsatzTV.Application/Playouts/Commands/SyncNextPlayoutHandler.cs

@@ -304,6 +304,7 @@ public partial class SyncNextPlayoutHandler(
                     var audioVersion = new MediaItemAudioVersion(playoutItem.MediaItem, headVersion);
                     await SelectTracks(
                         channel,
+                        playoutItem,
                         audioVersion,
                         nextPlayoutItem,
                         playoutItem.PreferredAudioLanguageCode ?? channel.PreferredAudioLanguageCode,
@@ -327,6 +328,7 @@ public partial class SyncNextPlayoutHandler(
 
     private async Task SelectTracks(
         Channel channel,
+        PlayoutItem playoutItem,
         MediaItemAudioVersion audioVersion,
         Core.Next.PlayoutItem nextPlayoutItem,
         string preferredAudioLanguage,
@@ -335,7 +337,7 @@ public partial class SyncNextPlayoutHandler(
         ChannelSubtitleMode subtitleMode,
         CancellationToken cancellationToken)
     {
-        List<Subtitle> allSubtitles = await GetSubtitles(audioVersion.MediaItem);
+        List<Subtitle> allSubtitles = await GetSubtitles(audioVersion.MediaItem, playoutItem.Id, playoutItem.InPoint);
 
         Option<MediaStream> maybeAudioStream = Option<MediaStream>.None;
         Option<Subtitle> maybeSubtitle = Option<Subtitle>.None;
@@ -407,6 +409,21 @@ public partial class SyncNextPlayoutHandler(
                     };
                 }
             }
+            else if (subtitle.Path.StartsWith("http://localhost", StringComparison.OrdinalIgnoreCase))
+            {
+                if (nextPlayoutItem.Tracks?.Subtitle?.Source is null)
+                {
+                    nextPlayoutItem.Tracks ??= new Core.Next.PlayoutItemTracks();
+                    nextPlayoutItem.Tracks.Subtitle ??= new Core.Next.TrackSelection();
+                    nextPlayoutItem.Tracks.Subtitle.Source = new Core.Next.Source
+                    {
+                        SourceType = Core.Next.SourceType.Http,
+                        Uri = subtitle.Path,
+                        KeepAlive = false,
+                        Reconnect = true
+                    };
+                }
+            }
         }
     }
 
@@ -672,7 +689,10 @@ public partial class SyncNextPlayoutHandler(
         }
     }
 
-    private static async Task<List<Subtitle>> GetSubtitles(MediaItem mediaItem)
+    private static async Task<List<Subtitle>> GetSubtitles(
+        MediaItem mediaItem,
+        int playoutItemId,
+        TimeSpan playoutItemInPoint)
     {
         List<Subtitle> allSubtitles = mediaItem switch
         {
@@ -682,7 +702,7 @@ public partial class SyncNextPlayoutHandler(
             Movie movie => await Optional(movie.MovieMetadata).Flatten().HeadOrNone()
                 .Map(mm => mm.Subtitles ?? [])
                 .IfNoneAsync([]),
-            //MusicVideo musicVideo => await GetMusicVideoSubtitles(musicVideo, channel, settings),
+            MusicVideo => GetMusicVideoSubtitles(playoutItemId, playoutItemInPoint),
             OtherVideo otherVideo => await Optional(otherVideo.OtherVideoMetadata).Flatten().HeadOrNone()
                 .Map(mm => mm.Subtitles ?? [])
                 .IfNoneAsync([]),
@@ -703,4 +723,25 @@ public partial class SyncNextPlayoutHandler(
 
         return allSubtitles;
     }
+
+    private static List<Subtitle> GetMusicVideoSubtitles(int playoutItemId, TimeSpan playoutItemInPoint)
+    {
+        string seekToMs = playoutItemInPoint > TimeSpan.Zero
+            ? $"?seekToMs={(long)playoutItemInPoint.TotalMilliseconds}"
+            : string.Empty;
+
+        return
+        [
+            new Subtitle
+            {
+                Codec = "ass",
+                Default = true,
+                Forced = true,
+                IsExtracted = false,
+                SubtitleKind = SubtitleKind.Generated,
+                Path = $"http://localhost:{Settings.StreamingPort}/ffmpeg/music-video-credits/{playoutItemId}{seekToMs}",
+                SDH = false
+            }
+        ];
+    }
 }

ErsatzTV.Application/Streaming/Queries/GetMusicVideoCreditsByPlayoutItemIdHandler.cs

@@ -60,9 +60,10 @@ public class GetMusicVideoCreditsByPlayoutItemIdHandler(
             switch (playoutItem.Playout.Channel.MusicVideoCreditsMode)
             {
                 case ChannelMusicVideoCreditsMode.GenerateSubtitles:
-                    var fileWithExtension = $"{playoutItem.Playout.Channel.MusicVideoCreditsTemplate}.sbntxt";
-                    if (!string.IsNullOrWhiteSpace(fileWithExtension))
+                    string templateName = playoutItem.Playout.Channel.MusicVideoCreditsTemplate;
+                    if (!string.IsNullOrWhiteSpace(templateName))
                     {
+                        var fileWithExtension = $"{templateName}.sbntxt";
                         subtitles.AddRange(
                             await musicVideoCreditsGenerator.GenerateCreditsSubtitleFromTemplate(
                                 musicVideo,
@@ -74,7 +75,7 @@ public class GetMusicVideoCreditsByPlayoutItemIdHandler(
                     {
                         logger.LogWarning(
                             "Music video credits template {Template} does not exist; falling back to built-in template",
-                            fileWithExtension);
+                            templateName);
 
                         subtitles.AddRange(
                             await musicVideoCreditsGenerator.GenerateCreditsSubtitle(