avmutablecomposition

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

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

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

问题 My app takes a video from a URL and allows you to add text to it, etc. It seems to crash when the video doesn't have any audio to begin with, can't seem to figure this out. This is what I have when the video is being composed: let asset = AVAsset(url: URL(string: self.videoURL)!) let mixComposition = AVMutableComposition() let videoTrack = mixComposition.addMutableTrack(withMediaType: .video, preferredTrackID: kCMPersistentTrackID_Invalid) try! videoTrack?.insertTimeRange(CMTimeRangeMake

来源： https://stackoverflow.com/questions/51671353/how-to-merge-mp4-and-mov-type-videos-using-avmutablecomposition-ios-swift

来源： https://stackoverflow.com/questions/51671353/how-to-merge-mp4-and-mov-type-videos-using-avmutablecomposition-ios-swift

来源： https://stackoverflow.com/questions/63588560/how-to-correctly-orient-multiple-video-tracks-taken-on-front-facing-cam-and-bac

来源： https://stackoverflow.com/questions/63588560/how-to-correctly-orient-multiple-video-tracks-taken-on-front-facing-cam-and-bac

来源： https://stackoverflow.com/questions/63588560/how-to-correctly-orient-multiple-video-tracks-taken-on-front-facing-cam-and-bac

来源： https://stackoverflow.com/questions/63588560/how-to-correctly-orient-multiple-video-tracks-taken-on-front-facing-cam-and-bac