I've created an app that allows mixing of several videos and their respective audio tracks. I can edit the volume levels just fine using an AVAudioMix, but what I would really like to be able to do is to adjust the pan of each audio track. I know pan can be adjusted for AudioUnits, but I cant see how audiounits could be used with an AVMutableVideoComposition. Panning is also available on AVAudioPlayers, but again this is a different area of AVFoundation. Does anyone know how I could pan the different audio tracks of a video composition like this?
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It looks like this might be possible using MTAudioProcessorTap. Theres a project provided by apple here : https://developer.apple.com/library/ios/samplecode/AudioTapProcessor/Introduction/Intro.html . This demonstrates how you can take an AVAssetTrack and apply a band pass filter - but potentially you can apply any AudioUnit effect - pan being a basic one. There are stereo vue meters in this project too. Its taken me many days to find this solution, seems its something that is little used.
Luke Smith
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