如果视频超过12秒没有声音

我使用AVFoundation创建自定义vido录制应用程序。问题是当录音达到13秒时声音全部从结果录像中消失。我设置了摄像头，是代码：如果视频超过12秒没有声音

private func configure(_ mode: CameraMode) { 
    guard let devices = AVCaptureDevice.devices(withMediaType: AVMediaTypeVideo) as? [AVCaptureDevice] else {return} 
    for device in devices { 
     if device.position == .back { 
      do { 
       let input = try AVCaptureDeviceInput(device: device) 
       if session.canAddInput(input) { 
        session.addInput(input) 
       } 
       configureVideoOutput(for: device) 
       session.startRunning() 
      } catch (let error) { 
       print(error) 
      } 
     } 
    } 

} 


private func configureVideoOutput(for device: AVCaptureDevice) { 
    if device.hasMediaType(AVMediaTypeVideo) && session.canAddOutput(sessionVideoOutput) { 
     session.beginConfiguration() 
     session.sessionPreset = AVCaptureSessionPresetHigh 
     guard let devices = AVCaptureDevice.devices(withMediaType: AVMediaTypeAudio) as? [AVCaptureDevice] else {return} 
     for device in devices { 
      do { 
       currentDevice = device 
       let input = try AVCaptureDeviceInput(device: device) 
       if session.canAddInput(input) { 
        session.addInput(input) 
        break 
       } 
      } catch (let error) { 
       print(error) 
       session.commitConfiguration() 
      } 
     } 
     session.addOutput(sessionVideoOutput) 
     session.commitConfiguration() 
    } 
}

和明星录制的视频与此代码：年底

@objc private func takeVideo(_ gesture: UILongPressGestureRecognizer) { 
    switch gesture.state { 
    case .began: 
     print("begin take video") 
     configure(.video) 
     if let _ = sessionVideoOutput.connection(withMediaType: AVMediaTypeAudio) { 
      let fileName = "mysavefile.mp4"; 
      let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] 
      let filePath = documentsURL.appendingPathComponent(fileName) 
      sessionVideoOutput.startRecording(toOutputFileURL: filePath, recordingDelegate: self) 
      setCaptureButtonToVideoMode(on: true) 
     } 
    case .ended, .cancelled: 
     print("end take video") 
     sessionVideoOutput.stopRecording() 
     setCaptureButtonToVideoMode(on: false) 
    default: 
     break 
    } 
}

我将视频保存到相机胶卷：

func capture(_ captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAt outputFileURL: URL!, fromConnections connections: [Any]!, error: Error!) { 
    print("capture did finish") 
    print(captureOutput) 
    print(outputFileURL) 
    PHPhotoLibrary.shared().performChanges({ 
     PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: outputFileURL) 
    }) { saved, error in 
    } 
}

如果视频小于13秒，一切都按预期工作。

来源

2017-03-19 Евгений Митько

当我录制电影时，我使用VCaptureMovieFileOutput()作为会话输出，它具有名为movieFragmentInterval的属性，默认情况下设置为10秒。将此属性更改为kCMTimeInvalid解决了该问题。

来源

2017-03-20 17:00:33

感谢兄弟你保存我的一天。 –

如果视频超过12秒没有声音

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