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使用AVFoundation录制到电影文件时出错

这是一个奇怪的问题.我没有更改任何涉及此项目的代码,但我的视频录制已经随机停止工作.当我尝试将电影保存到文件时,我收到以下错误:

错误域= NSOSStatusErrorDomain代码= -12780"操作无法完成.(OSStatus错误-12780.)"

我使用以下代码开始捕获:

- (void)initVideoCapture {
self.captureSession = [[AVCaptureSession alloc] init];

AVCaptureDevice *videoCaptureDevice = [self frontFacingCameraIfAvailable];
AVCaptureDeviceInput *videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoCaptureDevice error:nil];
[self.captureSession addInput:videoInput];

aMovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];    
[self.captureSession addOutput:aMovieFileOutput];
[self detectVideoOrientation:aMovieFileOutput];

[self.captureSession setSessionPreset:AVCaptureSessionPresetMedium];

[self.captureSession startRunning];

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}

然后我从viewController调用此方法开始录制:

- (void) startRecord {
NSDateFormatter *outputFormatter = [[NSDateFormatter alloc] init];
[outputFormatter setDateFormat:@"yyyyMMddHHmmss"];
NSString *newDateString = [outputFormatter stringFromDate:[NSDate date]];
[outputFormatter release];

NSString * fileString = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mov",newDateString]];
recordFileURL = [[NSURL alloc] initFileURLWithPath:fileString];        

[aMovieFileOutput startRecordingToOutputFileURL:recordFileURL recordingDelegate:self];

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}

这时我在这个函数中得到了错误.