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我在我的应用程序中使用 MPMoviePlayer 播放短视频,在 SDK 3.1.3 中没有问题。我对 SDK 4 中的代码进行了更改,但视频没有播放。我只是得到一个黑屏和音频。Apple Dev Center 没有针对最新 SDK 的此类的任何示例代码。以下是我正在使用的代码:

- (void)viewDidLoad {

    [super viewDidLoad];

        //videoPlayer is a MPMoviePlayerController object defined in the header file of the view controller

    if (videoPlayer == nil){
        NSString * videoPath = [[NSBundle mainBundle] pathForResource:@"myvideo" ofType:@"mp4"];
        if (videoPath == NULL){
            return; 
        }
        NSURL * videoURL = [NSURL fileURLWithPath:videoPath];

        videoPlayer = [[MPMoviePlayerController alloc] initWithContentURL:videoURL];
        videoPlayer.controlStyle = MPMovieControlStyleNone;
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinished:) name:@"MPMoviePlayerPlaybackDidFinishNotification" object:movieController.moviePlayer];

        [videoPlayer play];
        [videoPlayer setFullscreen:YES];
        [self.view addSubview:videoPlayer.view];


    }

}

以上结果只是在黑屏下播放音频。在播放结束时正确调用通知。

当上述方法不起作用时,我什至尝试使用新的 MPMoviePlayerViewController 类,如下所示:

- (void)viewDidLoad {

    [super viewDidLoad];
    NSString * videoPath = [[NSBundle mainBundle] pathForResource:@"myvideo" ofType:@"mp4"];

    if (videoPath == NULL){
        return; 
    }
    NSURL * videoURL = [NSURL fileURLWithPath:videoPath];

        //movieController is an MPMoviePlayerViewController object defined in the header file of view controller

    movieController = [[MPMoviePlayerViewController alloc] initWithContentURL:videoURL];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinished:) name:@"MPMoviePlayerPlaybackDidFinishNotification" object:movieController.moviePlayer];

    [movieController.moviePlayer setFullscreen:YES];
    [movieController.moviePlayer play];
    [self presentMoviePlayerViewControllerAnimated:movieController];
}

同样的问题仍然存在 - 我可以听到音频并且播放结束时的通知按预期调用。但是我只看到黑屏而不是视频。

视频的编码没有任何问题,因为相同的视频在 iTunes 和我的 iPod Touch 上的常规视频播放列表中都可以正常播放。

谁能帮我解决这个问题?

提前致谢

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1 回答 1

3

问题已解决 - 为了那些陷入类似问题的人的利益,解决方案是显式创建以下视图的框架MPMoviePlayerController

我改变了行:

[videoPlayer play];

[videoPlayer setFullscreen:YES];

[self.view addSubview:videoPlayer.view];

到以下:

[videoPlayer prepareToPlay];

[videoPlayer play];

[self.view addSubview:videoPlayer.view];

videoPlayer.view.frame = CGRectMake(0.0, 0.0, 480.0, 320.0); //this is explicitly added and solves the problem
于 2010-07-04T06:50:24.837 回答