Error recording to movie file with AVFoundation

This is a strange problem. I have not changed any code involving this in my project but my video recording has randomly sto开发者_StackOverflowpped working. When I try to save to a movie to a file I get the following error:

Error Domain=NSOSStatusErrorDomain Code=-12780 "The operation couldn’t be completed. (OSStatus error -12780.)"

I start my capture with the following code:

- (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];

}

I then call this method from the viewController to start recording:

- (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];

}

At this time I get the error in this function.

• (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error

What is really weird is that it randomly works sometimes. Like, I will compile the project and it will work 100% of the time. Next time I compile it will work 0%. What could I be doing wrong? Anything obvious?

I've gotten -12780 when the orientation of the device was UIDeviceOrientationFaceUp, UIDeviceOrientationFaceDown and UIDeviceOrientationUnknown. Since a recoded video's orientation has to be portrait or landscape, it'll error out on you. I had to write a quick method that checks for those three, and just translates them to portrait.

this seems to be a bug with apple. i solved it by using AVAssetWriter and AVAssetWriterInput