使用 AVFoundation 录制视频

Question

我已经创建了会话、设备、输入和输出，但是当我调用 startRecordingToOutputFileURL:recordingDelegate: 方法时，它调用了 didFinishRecordingToOutputFileAtURL 委托方法，所以它在没有开始！

这是我的代码..

-(void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];

AVCaptureSession *session = [[AVCaptureSession alloc] init];
[session setSessionPreset:AVCaptureSessionPresetPhoto];

AVCaptureDevice *inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];


AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:inputDevice error:&error];

if ([session canAddInput:deviceInput]) {
[session addInput:deviceInput];
}

AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];

[previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
CALayer *rootLayer = [[self view] layer];
[rootLayer setMasksToBounds:YES];
CGRect frame = self.view.frame;

[previewLayer setFrame:frame];

[rootLayer insertSublayer:previewLayer atIndex:0];

_movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];

if ([session canAddOutput:movieFileOutput]) {
    [session addOutput:movieFileOutput];
}

[session startRunning];
}
-(void)buttonClicked {
[_movieFileOutput startRecordingToOutputFileURL:url recordingDelegate:self];
}

- (void)captureOutput:(AVCaptureFileOutput *)captureOutput
didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL
      fromConnections:(NSArray *)connections
            error:(NSError *)error {
    //This method is getting called when I press the button
    NSLog(@"Finished Recording");

}

那么我的代码有什么问题？ 我错过了什么吗？

谢谢

Answer 1

终于成功了！

问题出在 URL 上。 我尝试了许多 URL，但没有一个有效，它必须在 NSDocumentsDirectory 中，就是这样！