ADd more null check

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -1278,7 +1278,7 @@ namespace MediaBrowser.Controller.MediaEncoding
                 param += " -pix_fmt nv21";
             }
 
-            var isVc1 = string.Equals(state.VideoStream.Codec, "vc1", StringComparison.OrdinalIgnoreCase);
+            var isVc1 = string.Equals(state.VideoStream?.Codec, "vc1", StringComparison.OrdinalIgnoreCase);
             var isLibX265 = string.Equals(videoEncoder, "libx265", StringComparison.OrdinalIgnoreCase);
 
             if (string.Equals(videoEncoder, "libx264", StringComparison.OrdinalIgnoreCase) || isLibX265)