Add dts to list of audio codecs which require strict -2

Adds dts to the list of audio codecs where ffmpeg will throw asking us
to opt into experimental support. This is seen when the original content
is based on dts and we don't acopy using ffmpeg.

Jellyfin.Api/Controllers/DynamicHlsController.cs

@@ -1704,11 +1704,12 @@ namespace Jellyfin.Api.Controllers
                 return audioTranscodeParams;
             }
 
-            // flac and opus are experimental in mp4 muxer
+            // dts, flac and opus are experimental in mp4 muxer
             var strictArgs = string.Empty;
 
             if (string.Equals(state.ActualOutputAudioCodec, "flac", StringComparison.OrdinalIgnoreCase)
-                || string.Equals(state.ActualOutputAudioCodec, "opus", StringComparison.OrdinalIgnoreCase))
+                || string.Equals(state.ActualOutputAudioCodec, "opus", StringComparison.OrdinalIgnoreCase)
+                || string.Equals(state.ActualOutputAudioCodec, "dts", StringComparison.OrdinalIgnoreCase))
             {
                 strictArgs = " -strict -2";
             }