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我正在使用AVCaptureSession. 捕捉输入是标准的音频和视频AVCaptureDevice。捕获输出为AVCaptureMovieFileOutput. 如何改变音量？
AVCaptureSession
AVCaptureDevice
AVCaptureMovieFileOutput
可以通过共享更改音频音量，AVAudioSession如下所示：
AVAudioSession
try! AVAudioSession.sharedInstance().setInputGain(0.5)