Error on video recording in objective-c - objective-c

Question

I played with the AVCam demo sample in order to add a player (MPMoviePlayerController) that allows the preview of the recorded video
I added a play button in the xib and the corresponding IBOutlet and IBActions + a player:
#property (nonatomic,retain) IBOutlet UIBarButtonItem *playerButton;
#property (nonatomic, assign) MPMoviePlayerController *player;
- (IBAction)playVideo:(id)sender;
I do initialize the player in the viewdidload:
player = [[MPMoviePlayerController alloc] init];
the play Action is as follows
- (IBAction)playVideo:(id)sender {
if(player) {
[player stop];
}
// Create a new movie player object.
[player setContentURL:[[[self captureManager] recorder] outputFileURL]];
player.movieSourceType = MPMovieSourceTypeFile;
[player prepareToPlay];
CGRect viewInsetRect = CGRectMake( 0, 0, 200, 300);
// Inset the movie frame in the parent view frame.
[[player view] setFrame:viewInsetRect];
player.scalingMode = MPMovieScalingModeAspectFill;
player.controlStyle = MPMovieControlStyleNone;
//player.useApplicationAudioSession = NO;
//[self.view addSubview: [_player view]];
[self.view addSubview:player.view];
if(player) {
[player play];
}
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(playComplete) name:MPMoviePlayerPlaybackDidFinishNotification object:player];
}
and the playComplete called when play is finished:
-(void)playComplete {
[player.view removeFromSuperview];
}
result:
When I launch the app, I can record as many videos as I want.
when I play the last recorded video, I can play it without problems
but after playing the video, if i try to record again, I encounter this error as soon as it starts recording:
Error Domain=AVFoundationErrorDomain Code=-11803 "Cannot Record" UserInfo=0x152e60 {NSLocalizedRecoverySuggestion=Try recording again., AVErrorRecordingSuccessfullyFinishedKey=false, NSLocalizedDescription=Cannot Record}
i thought it was a problem on the temp output file, but it seems not.
I'm wondering if introducing a MPMoviePlayerController breaks the behavior of the app in some way that I cannot figure out.
do some of you have any idea?
Thanks
P

Answer 1

found that the -11803 was due to the fact that the captureManager session was not running (found the answer on Stackoverflow but i did not understand it very fast...)
at the end of the video preview play, in playComplete, I added a test to check the capture manager session status, to make it run if this was not the case anymore.
-(void)playComplete {
[player.view removeFromSuperview];
if(![[[self captureManager] session] isRunning]) {
// Start the session. This is done asychronously since -startRunning doesn't return until the session is running.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[[[self captureManager] session] startRunning];
});
}
}
It is working now, but if anyone knows why the video preview stops the captureManager session, I would be happy to understand it.
P