使用AVPlayer在iPhone上播放许多不同的视频

Question

我正在使用AVFoundation为iOS设置自定义视频播放器。这个想法是能够用手势切换到不同的视频（点击，轻扫，无论）。 现在玩家在模拟器上完美地工作，但是当我在实际设备上测试它时，视图在3或4次滑动后变为空白。我甚至为我的播放器创建了播放控件，当视图变为空白时，这些控件正确加载，但什么都不做。任何想法家伙？ 这是玩家的初始化

  - (id)initWithContentURL:(NSString *)aContentURL delegate:(id)aDelegate { 
     self = [super initWithNibName:@"NoCashMoviePlayer" bundle:nil]; 
     if (self == nil) 
      return nil; 
     delegate = aDelegate; 
     systemPath = [aContentURL retain]; 
     contentURL = [[NSURL alloc]initFileURLWithPath:systemPath]; 
     asset = [AVURLAsset URLAssetWithURL:contentURL options:nil]; 
     playerItem = [AVPlayerItem playerItemWithAsset:asset]; 
     isPaused = false; 
     controlsHidden = false; 
     self.player = [[AVPlayer playerWithPlayerItem:playerItem] retain]; 
     duration = self.player.currentItem.asset.duration; 

     return self; 
    } 

这是播放视频的代码：

-(void)playMovie{ 

     UITapGestureRecognizer *tapRecon = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(toggleControls:)]; 
     [tapRecon setNumberOfTapsRequired:2]; 
     [self.movieContainer addGestureRecognizer:tapRecon]; 
     [tapRecon release]; 

     NSLog(@"Playing item: %@",contentURL); 
     playerLayer = [AVPlayerLayer playerLayerWithPlayer:player]; 
     [movieContainer.layer addSublayer:playerLayer]; 
     playerLayer.frame = movieContainer.layer.bounds; 
     playerLayer.videoGravity = AVLayerVideoGravityResizeAspect; 
     self.seeker.alpha = 1.0; 
     [self.view addSubview:movieContainer]; 
     [self.movieContainer addSubview:controls]; 
     [self setSlider]; 
     [player play]; 
     player.actionAtItemEnd = AVPlayerActionAtItemEndNone; 

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


    } 

代码选择剪辑播放：

-(void)viewSelect: (double) curTime{ 
     self.myView.backgroundColor = [UIColor blackColor]; 
     UISwipeGestureRecognizer *swipeRecognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeFrom:)]; 
     swipeRecognizer.direction = UISwipeGestureRecognizerDirectionRight; 
     [self.myView addGestureRecognizer:swipeRecognizer]; 
     [swipeRecognizer release]; 

     UISwipeGestureRecognizer *leftRecognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeFromLeft:)]; 
     swipeRecognizer.direction = UISwipeGestureRecognizerDirectionLeft; 
     [self.myView addGestureRecognizer:leftRecognizer]; 
     [leftRecognizer release]; 


     if(isMain){ 
      [UIView animateWithDuration:0.5 delay:0.0 options:UIViewAnimationTransitionFlipFromLeft animations:^{ 
       self.myView.alpha = 1.0; 
       moviePlayer = [[NoCashMoviePlayer alloc]initWithContentURL:[self movieURL:vidIndex] delegate:self]; 
       self.moviePlayer.view.frame = self.myView.bounds; 
       self.moviePlayer.view.autoresizingMask = UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight; 
       [self.myView addSubview:moviePlayer.view]; 

      }completion:^(BOOL finished) { 
       [self.moviePlayer.player seekToTime:CMTimeMake(curTime, 1)]; 
       [self.moviePlayer playMovie]; 
      }]; 
     }else{ 

      [UIView animateWithDuration:0.5 delay:0.0 options:UIViewAnimationTransitionFlipFromLeft animations:^{ 
       self.otherView.alpha = 1.0; 
       moviePlayer = [[NoCashMoviePlayer alloc]initWithContentURL:[self movieURL:vidIndex] delegate:self]; 
       self.moviePlayer.view.frame = self.otherView.bounds; 
       self.moviePlayer.view.autoresizingMask = UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight; 
       [self.otherView addSubview:moviePlayer.view]; 

      }completion:^(BOOL finished) { 

       [self.moviePlayer.player seekToTime:CMTimeMake(curTime, 1)]; 
       [self.moviePlayer playMovie]; 
      }]; 
     } 
    } 

而去年手势动作：

- (void)handleSwipeFromLeft:(UISwipeGestureRecognizer *)recognizer { 

     double elapsedTime = 0.0; 
     if(vidIndex==0){ 
      vidIndex = 3; 
     }else vidIndex = vidIndex --; 
     elapsedTime = [self.moviePlayer currentTimeInSeconds]; 
     [self.moviePlayer stopMovie]; 
     isMain = !isMain; 
     [self viewSelect: elapsedTime]; 

    } 

编辑：尝试使用不同的AVPlayerLayers为每个视频文件，相同的情况下，在模拟器，而不是在iPad上工作。编辑2：我运行乐器来分析核心动画表现，当视频播放时显示的帧速率约为30 fps，当播放器变为空白时，它一路下降到1或2 fps。这可能是ovibious，但仍然，如果它有助于给更多的光.....

编辑3：好吧，我终于到了某个地方，我知道什么问题是，我有一个核心动画内存泄漏，在模拟器中它“起作用”，因为电脑比iPad有更多的内存，但是由于iPad内存非常有限，它会很快停止工作。如果任何人有任何关于核心动画泄漏的建议，它将会很受欢迎。

Answer 1

我最终解决了它。我的设计确实很差，它的内存管理非常糟糕，等等。我所做的是，我并没有释放所有可能的东西，包括视图，图层，玩家，资产等，我只是创建了一种方法来更新玩家的资产和物品，回收玩家，视图，图层等。

[player pause]; 
    contentURL = [[NSURL alloc] initFileURLWithPath:newPath]; 
    AVAsset *newAsset = [AVURLAsset URLAssetWithURL:contentURL options:nil]; 
    AVPlayerItem *newPlayerItem = [AVPlayerItem playerItemWithAsset:newAsset]; 
    [player replaceCurrentItemWithPlayerItem:newPlayerItem]; 
    [contentURL release]; 

现在它的工作奇迹。感谢大家的帮助。

Answer 2

代码中有2个地方保留了一个对象，并且我没有在您发布的代码中的任何地方看到相应的发布。我首先确定内存引用计数递增和递减都是适当平衡的。

第一个保留看起来对我很可疑。通常应先自动释放可变您要指派给，然后保留如下：

[systemPath autorelease]; 
systemPath = [aContentURL retain] 

在上面的代码很容易地看到，保留/释放匹配被维持，并且远小于误差比其他方案更容易。请注意，如果systemPath == aContentURL该对象将不会被释放。