Why can't I rely on NSNotificationCenter using AVFoundation to loop video?

问题

I loop my video played with AVFoundation video with the help of NSNotificationCenter and playerItemDidReachEnd:

    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:url options:nil];
    self.playerItem = [AVPlayerItem playerItemWithAsset:asset];
    self.avPlayer = [AVPlayer playerWithPlayerItem:self.playerItem];

    [self.avPlayer      addObserver:self forKeyPath:@"status"
                        options:0 context:AVMoviePlayerViewControllerStatusObservationContext];
    [[NSNotificationCenter defaultCenter]           addObserver:self
                                                    selector:@selector(playerItemDidReachEnd:)
                                                    name:AVPlayerItemDidPlayToEndTimeNotification
                                                    object:[self.avPlayer currentItem]];

    [self.VideoView setPlayer:self.avPlayer];

and

- (void)playerItemDidReachEnd:(NSNotification *)notification {        
        [notification.object seekToTime:kCMTimeZero];
        [self startVideoLoop];
}

works great - but unfortunately not reliable. some times without any logic reason (seems to me) the player stops at the end of the movie without restarting again.

is it possible that NSNotificationCenter misses the end of the movie or the method playerItemDidReachEnd misses the notification message? stupid question. but I am unable to make head nor tail of it...

回答1:

the answer ist

self.avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;  // default: AVPlayerActionAtItemEndPause

来源：https://stackoverflow.com/questions/12238429/why-cant-i-rely-on-nsnotificationcenter-using-avfoundation-to-loop-video