Hi
I'm running in to a small issue where my custom AVVideoCompositing can't be used on already exported videos from our app. The issue I've found is that when the audio track is the first track in the asset the custom AVVideoCompositing fails to get a frame buffer and sourceTrackIds for the AVAsynchronousVideoCompositionRequest is empty.
When playing the composition direcltly it works but the track reorder seems to happen at export time. The best solution would to make the custom AVVideoCompositing handle any track order but I can't get this to work?
Any one have tips for either fixing the order at export or support better AVVideoCompositing?