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用AVAssetExportSession导出一个修剪的音频
iOS
AVFoundation
AVAssetExportSession
如何使用AVFoundation从相机捕获视频帧生成图像
Objective-C
AVFoundation
捕获视频帧
iOS开发系列--音频播放、录音、视频播放、拍照、视频录制
iOS
AudioTookbox
AVFoundation
MediaPlayer
AVAudioPlayer
AVAudioRecorder
AVAudioSession
MPMusicPlayerControl
MPMoviePlayer
avplayer
UIImagePickerControl
AVCaptureDevice
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