Recording video with AVCaptureSession - iphone

Question

I'm trying to record a video using AVCaptureSession and AVCaptureMovieFileOutput but whenever I try to start recording I get this error in the didFinishRecordingToOutputFileAtURL AVCaptureFileOutputRecordingDelegate method.
Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo=0x15de7c40 {AVErrorRecordingSuccessfullyFinishedKey=false, NSLocalizedDescription=The operation could not be completed, NSLocalizedFailureReason=An unknown error occurred (-12673), NSUnderlyingError=0x15d88aa0 "The operation couldn’t be completed. (OSStatus error -12673.)"}
This is the code I'm using to add the AVCaptureMovieFileOutput and initialise my AVCaptureSession
- (AVCaptureSession *)session {
if (!_session) {
_session = [[AVCaptureSession alloc] init];
// ADD CAMERA DEVICE
NSError *error = nil;
AVCaptureDeviceInput *videoInput = [AVCaptureDeviceInput deviceInputWithDevice:self.videoDevice error:&error];
if (!videoInput) {
NSLog(#"ERROR: trying to open camera: %#", error);
} else {
[_session addInput:videoInput];
}
// ADD AUDIO DEVICE
error = nil;
AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:self.audioDevice error:&error];
if (!audioInput)
{
NSLog(#"ERROR: trying to open mic: %#", error);
} else {
[_session addInput:audioInput];
}
// ADD OUTPUT FILE
if ([_session canAddOutput:self.movieFileOutput]) {
[_session addOutput:self.movieFileOutput];
}
[_session startRunning];
}
return _session;
}
My AVCaptureMovieFileOutput is lazy loaded like this
- (AVCaptureMovieFileOutput *)movieFileOutput {
if (!_movieFileOutput) {
_movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
Float64 TotalSeconds = 60; //Total seconds
int32_t preferredTimeScale = 30; //Frames per second
CMTime maxDuration = CMTimeMakeWithSeconds(TotalSeconds, preferredTimeScale);
_movieFileOutput.maxRecordedDuration = maxDuration;
_movieFileOutput.minFreeDiskSpaceLimit = 1024 * 1024;
}
return _movieFileOutput;
}
I'm not sure what I'm doing wrong as most of the tutorials I've seen do it this way.
Thanks

Answer 1

Underlying error code is -12673, which is usually caused by attempt to write into unwritable directory or file. Try to write using this code:
NSString *documentsDirPath =[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
NSURL *documentsDirUrl = [NSURL fileURLWithPath:documentsDirPath isDirectory:YES];
NSURL *url = [NSURL URLWithString:#"out.mp4" relativeToURL:documentsDirUrl];
[self.movieFileOutput startRecordingToOutputFileURL:url recordingDelegate:self];