Loop AVMutableCompositionTrack
问题 I have got two audio tracks on me that I combine with one another like this: AVMutableComposition *composition = [[AVMutableComposition alloc] init]; AVMutableCompositionTrack *compositionAudioTrack = [composition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; [compositionAudioTrack setPreferredVolume:1.0]; AVAsset *avAsset = [AVURLAsset URLAssetWithURL:originalContentURL options:nil]; AVAssetTrack *clipAudioTrack = [[avAsset tracksWithMediaType