MPMoviePlayerController有时播放音频，而不是在淡入淡出时的视频

问题描述：

我有一个问题，在UIScrollView中，我有一些视图（视频控制器在下面）充当视频内容的页面（最初显示缩略图视图）。MPMoviePlayerController有时播放音频，而不是在淡入淡出时的视频

有时（但并非总是）当我滚动到下一页时，视频的音频开始播放，但没有视觉效果。这似乎并不当我不褪色的视图中的发生

视频初始化代码为：

MPMoviePlayerController* moviePlayer = [[MPMoviePlayerController alloc] init]; 

    self.moviePlayer = moviePlayer; 

    [moviePlayer setControlStyle:MPMovieControlStyleNone]; 
    [moviePlayer setRepeatMode:MPMovieRepeatModeOne]; 
    [moviePlayer.view setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)]; 

    moviePlayer.backgroundView.backgroundColor = [UIColor clearColor]; 
    moviePlayer.movieSourceType = MPMovieSourceTypeStreaming; 
    moviePlayer.contentURL = [NSURL URLWithString:[videoData.video src]]; 

    [self.videoController.view addSubview:self.moviePlayer.view]; 
    [self.videoController.view bringSubviewToFront:moviePlayer.view]; 
    [moviePlayer.view setAlpha:0.0f]; 

    // Movie Observer 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkMovieStatus:) name:MPMoviePlayerLoadStateDidChangeNotification object:nil]; 

    // Add tap handler 
    UITapGestureRecognizer *singleFingerTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(onPlayerTapped:)]; 
    singleFingerTap.numberOfTapsRequired = 1; 
    singleFingerTap.delegate = self; 
    [self.moviePlayer.view addGestureRecognizer:singleFingerTap]; 

    [moviePlayer prepareToPlay];

和播放代码（尽量避免黑色闪光在视频的开始）是：

- (void)checkMovieStatus:(NSNotification *)notification { 
    if(self.moviePlayer.readyForDisplay && (MPMovieLoadStatePlayable | MPMovieLoadStatePlaythroughOK)) { 

      [self.moviePlayer play]; 

      [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerLoadStateDidChangeNotification object:nil]; 

      [UIView animateWithDuration:0.4f animations:^{ 
       [self.moviePlayer.view setAlpha:1.0f]; 
      } completion:^(BOOL finished) { 
       //[self.moviePlayer play]; // tried here as well 
      }]; 
     } 
}

代码，以消除滚动视频的看法是：

- (void)removeMoviePlayer { 
     if(self.moviePlayer) { 
       [self.moviePlayer stop]; 

       [self.moviePlayer.view removeFromSuperview]; 

       self.moviePlayer = nil; 
     } 
}

答

我发现了一个很奇怪的修复这个PROBL EM。在我的情况下，我会滑动到视频和音频播放，并没有图片。如果我刷卡并回来，一切正常，所以只是为了它的乐趣我试过这个

MPMoviePlayerController *mp = [self.arrayOfScrollView objectAtIndex:xx]; 
[mp play]; 
[mp stop]; 
[mp play];

奇怪的是，工作。既然你在六个月前发布了这篇文章，如果你发现了另一种解决方法，我很想知道它。

MPMoviePlayerController有时播放音频，而不是在淡入淡出时的视频

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