encode ass subs

MediaBrowser.Server.Implementations/Library/MediaSourceManager.cs

@@ -68,6 +68,10 @@ namespace MediaBrowser.Server.Implementations.Library
 
             if (stream.IsTextSubtitleStream)
             {
+                if (string.Equals(stream.Codec, "ass", StringComparison.OrdinalIgnoreCase))
+                {
+                    return false;
+                }
                 return true;
             }