Extend TranscodingReason reporting

MediaBrowser.Controller/MediaEncoding/EncodingJobInfo.cs

@@ -515,6 +515,15 @@ namespace MediaBrowser.Controller.MediaEncoding
 
         public int HlsListSize => 0;
 
+        /// <summary>
+        /// Adds the specified reason(s) to <see cref="TranscodeReasons"/>.
+        /// </summary>
+        /// <param name="reason">The transcode reason(s) to add.</param>
+        public void AddTranscodeReason(TranscodeReason reason)
+        {
+            _transcodeReasons = TranscodeReasons | reason;
+        }
+
         private int? GetMediaStreamCount(MediaStreamType type, int limit)
         {
             var count = MediaSource.GetStreamCount(type);