使用AVPlayer在iphone上播放许多不同的视频

使用AVPlayer在iphone上播放许多不同的视频,iphone,xcode,ipad,media-player,avfoundation,Iphone,Xcode,Ipad,Media Player,Avfoundation,我正在使用AVFoundation为iOS开发一个自定义视频播放器。这个想法是能够切换到一个不同的视频与一个手势(点击,滑动,无论什么)现在播放器在模拟器上完美地工作,但当我在实际设备上测试它时,在3或4次滑动后,视图变为空白。我甚至为我的播放器创建了播放控件,当视图变为空白时,这些控件会正确加载,但不会执行任何操作。有什么想法吗,伙计们? 这是播放器的初始化 - (id)initWithContentURL:(NSString *)aContentURL delegat

我正在使用AVFoundation为iOS开发一个自定义视频播放器。这个想法是能够切换到一个不同的视频与一个手势(点击,滑动,无论什么)现在播放器在模拟器上完美地工作,但当我在实际设备上测试它时,在3或4次滑动后,视图变为空白。我甚至为我的播放器创建了播放控件,当视图变为空白时,这些控件会正确加载,但不会执行任何操作。有什么想法吗,伙计们? 这是播放器的初始化

            - (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]];


    }
选择要播放的剪辑的代码:

    -(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];
            }];
        }
    }
最后是手势动作:

    - (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:尝试对每个视频文件使用不同的AVPlayerLayer,相同的情况下,在模拟器中工作,而不是在iPad上

编辑2:我运行instruments来分析核心动画性能,当播放视频时,它显示的帧速率约为30 fps,当播放器变为空白时,它会一直下降到1或2 fps。这可能是卵生的,但如果它有助于提供更多的光


编辑3:好的,我终于有了进展,我知道问题是什么,我有一个核心动画内存泄漏,在模拟器中它“工作”,因为计算机的内存比iPad多得多,但由于iPad的内存非常有限,它很快停止工作。如果任何人对核心动画泄漏有任何建议,都会受到欢迎。

代码中有两个地方保留了一个对象,我在您发布的代码中没有看到相应的版本。首先,我要确保内存引用计数的增量和减量都是适当平衡的

在我看来,第一个问题很可疑。通常,您应该首先自动释放指定给的变量,然后按如下方式保留变量:

[systemPath autorelease];
systemPath = [aContentURL retain]

在上面的代码中,很容易看出保留/释放匹配得到了维护,并且比其他方案更不容易出错。请注意,如果
systemPath
==
aContentURL
对象将不会被释放。

我最终解决了它。我的设计确实很差,内存管理很差等等。我所做的不是发布我能发布的一切,包括视图、图层、玩家、资产等,而是创建了一个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];

现在它正在创造奇迹。谢谢大家的帮助。

所有保留的对象都将通过“dealloc”方法释放。够了吗?事实上,我以前的播放器没有'retain'关键字,但更糟糕的是,它最终导致了崩溃,因为对象在运行时的某个点被释放。如果没有看到确切的代码,我不确定。但是第一次保留似乎没有遵循标准模式。感谢Himadri的帮助,我尝试了几种不同的内存/引用计数解决方案,但它不起作用。我试过使用仪器,但有一些泄漏,我处理好了,仍然没有发现。我会继续努力的。