Fill in issue/PR comment

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -5787,7 +5787,7 @@ namespace MediaBrowser.Controller.MediaEncoding
             }
 
             // Copy the movflags from GetProgressiveVideoFullCommandLine
-            // See # for explanation on why this is needed
+            // See #9248 and the associated PR for why this is needed
             var mp4ContainerNames = new HashSet<String> {
                 "mp4",
                 "m4a",