Question

我希望在iPhone中获得视频的总持续时间。我使用以下代码获取持续时间

videoPath = [videoPath stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *url = [NSURL URLWithString:videoPath];
MPMoviePlayerController *mpPlayer = [[[MPMoviePlayerController alloc] initWithContentURL:url] autorelease]; 
mpPlayer.view.frame = CGRectMake(0, 0, 320, 100);
[self.view addSubview:mpPlayer.view];
NSLog(@"duration = %f",mpPlayer.duration);
[mpPlayer play];

但我不知道为什么我无法获得视频的持续时间，视频也无法播放。任何人都可以帮我找到解决这个问题的方法。

提前致谢。

Answer 1

提示：

在实际播放之前，持续时间可能无法使用 - ＆gt;收到MPMoviePlayerPlaybackStateDidChangeNotification后，请再次检查持续时间（MPMoviePlayerController.playbackState == MPMoviePlaybackStatePlaying)是安全的。

Answer 2

请检查视频路径是否正确，并检查播放器是否分配了正确的文件URL

Answer 3

    videoPath = [videoPath stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSURL *url = [NSURL URLWithString:videoPath];
    MPMoviePlayerController *mpPlayer = [[[MPMoviePlayerController alloc] initWithContentURL:url] autorelease]; 
    mpPlayer.view.frame = CGRectMake(0, 0, 320, 100);
    [self.view addSubview:mpPlayer.view];
    NSLog(@"duration = %f",mpPlayer.duration);
    [mpPlayer play];

//add notifications


  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(MPMoviePlayerLoadStateDidChange:) name:MPMoviePlayerLoadStateDidChangeNotification object:nil];

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

    if ((moviePlayer.loadState & MPMovieLoadStatePlaythroughOK) == MPMovieLoadStatePlaythroughOK) {
duration = mpPlayer.duration;
NSLog(@"duration = %f",mpPlayer.duration);
}
}

视频不能与MPMoviePlayerController一起播放

3 个答案: