Ios AVPlayer播放音频，但视频冻结

我有两个

uiviewcontroller

，每个控制器都有一个

AVPlayer

，当它们被推入

UINavigationController

时，应该播放一个视频文件：

-(void)viewWillAppear:(BOOL)animated{

    videoView = [[UIView alloc]initWithFrame:self.view.frame];

    NSString *filepath = [[NSBundle mainBundle] pathForResource:@"myVideo" ofType:@"mov"];
    NSURL *fileURL = [NSURL fileURLWithPath:filepath];
    self.avPlayer = [AVPlayer playerWithURL:fileURL];

    AVPlayerLayer *foregroundLayer = [AVPlayerLayer playerLayerWithPlayer:self.avPlayer];
    self.avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;
    foregroundLayer.frame = self.view.frame;
    foregroundLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;

    [videoView.layer addSublayer:foregroundLayer];

    [self.view addSubview:videoView];

    self.avPlayer.actionAtItemEnd = AVPlayerActionAtItemEndNone;

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(playerItemDidReachEnd:)
                                                 name:AVPlayerItemDidPlayToEndTimeNotification
                                               object:[self.avPlayer currentItem]];
}

-(void)viewDidAppear:(BOOL)animated{

    [self.avPlayer play];
}

-(void)playerItemDidReachEnd:(NSNotification *)notification {

    [self.navigationController popViewControllerAnimated:NO]
}

第一次按下任何

UIViewController

时，播放效果良好。但在那之后，如果我再次按下其中任何一个按钮，声音就会播放，但视频会冻结

---

我尝试过使用

mpmovieplayervewcontroller

，但行为是一样的。有什么想法吗？

奇怪！我也对你这样做。它工作得很好。声音和视频都可以播放。我从这篇文章中读到：