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我正在尝试将音频用于iOS应用程序的视频.视频很好.文件中没有录制音频(我的iPhone扬声器工作.)

这是init设置:

session = [[AVCaptureSession alloc] init];
    menu->session = session;
    menu_open = NO;
    session.sessionPreset = AVCaptureSessionPresetMedium;
    camera = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    microphone = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
    menu->camera = camera;
    [session beginConfiguration];
    [camera lockForConfiguration:nil];
    if([camera isExposureModeSupported:AVCaptureExposureModeContinuousAutoExposure]){
        camera.exposureMode = AVCaptureExposureModeContinuousAutoExposure;
    }
    if([camera isFocusModeSupported:AVCaptureFocusModeContinuousAutoFocus]){
        camera.focusMode = AVCaptureFocusModeContinuousAutoFocus;
    }
    if([camera isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance]){
        camera.whiteBalanceMode = AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance;
    }
    if ([camera hasTorch]) {
        if([camera isTorchModeSupported:AVCaptureTorchModeOn]){
            [camera setTorchMode:AVCaptureTorchModeOn];
        }
    }
    [camera unlockForConfiguration];
    [session commitConfiguration];
    AVCaptureDeviceInput * camera_input = [AVCaptureDeviceInput deviceInputWithDevice:camera error:nil];
    [session addInput:camera_input];
    microphone_input = [[AVCaptureDeviceInput deviceInputWithDevice:microphone error:nil] retain];
    AVCaptureVideoDataOutput * …