ios – AVCaptureSession录制视频与音频

我的应用程序设置为使用AVCaptureSession从相机录制视频,但是没有音频.我需要做什么来录制音频,然后将其添加到该文件的videoOutput？这是我录制视频的代码：

AVCaptureSession *session = [[AVCaptureSession alloc] init];
[session beginConfiguration];
session.sessionPreset = AVCaptureSessionPresetMedium;

CALayer *viewLayer = self.vImagePreview.layer;
NSLog(@"viewLayer = %@",viewLayer);

AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
captureVideoPreviewLayer.frame = self.vImagePreview.bounds;

[self.vImagePreview.layer addSublayer:captureVideoPreviewLayer];

AVCaptureDevice *device = [self frontFacingCameraIfAvailable];

NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
if (!input) {
    // Handle the error appropriately.
    NSLog(@"ERROR: trying to open camera: %@",error);
}

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *documentsDirectoryPath = [paths objectATindex:0];

AVCaptureMovieFiLeoutput *movieFiLeoutput = [[AVCaptureMovieFiLeoutput alloc] init];

NSString *archives = [documentsDirectoryPath StringByAppendingPathComponent:@"archives"];
NSString *outputpathofmovie = [[archives StringByAppendingPathComponent:@"Test"] StringByAppendingString:@".mp4"];
NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputpathofmovie];

[session addInput:input];
[session addOutput:movieFiLeoutput];
[session commitConfiguration];
[session startRunning];
[movieFiLeoutput startRecordingToOutputFileURL:outputURL recordingDelegate:self];

我为音频添加了另一个输入,但它不能与后台的mpmovieplayercontroller一起使用.有什么想法可以播放一个视频,同时记录相机的音频和视频？

AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
AVCaptureDeviceInput * audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:nil];
[session addInput:audioInput]