iphone - 如果视频文件损坏，MPMoviePlayerViewController 可以返回错误吗？

Question

我正在下载视频并将其保存在某个目录中，以便用户之后可以播放该文件。

它在所有情况下都运行良好，例如由于网络波动而停止下载并再次恢复时。但有时文件已完全下载但未在 MPMoviePlayerViewController 中播放。

我正在使用 ASIHTTPRequest 在后台下载视频文件。

观察:可能是在下载的时候，网络有些波动，文件可能损坏了。

问题:我如何知道下载的文件已损坏？ (通过 MPMoviePlayerViewControll)

有什么建议吗？下面是播放代码:

@ACB...我使用了您的代码，但它总是处于其他情况:

    playerViewController = [[MPMoviePlayerViewController alloc]initWithContentURL:url];

    player = [playerViewController moviePlayer];
    player.movieSourceType = MPMovieSourceTypeFile;
    [player prepareToPlay];

    if(player.loadState == MPMovieLoadStatePlayable)
    {
        playerViewController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
        [self presentMoviePlayerViewControllerAnimated:playerViewController];


        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerInterruptByUser:) name:MPMoviePlayerPlaybackStateDidChangeNotification object:playerViewController.moviePlayer];

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerFinished:) name:MPMoviePlayerPlaybackDidFinishNotification object:playerViewController.moviePlayer];

        //[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerFinished:) name:UIApplicationDidEnterBackgroundNotification object:playerViewController.moviePlayer];

        [player play];
    }
    else
    {
        corruptVideoAlert = [[UIAlertView alloc]initWithTitle:NSLocalizedString(@"Corrupt Video", nil) message:NSLocalizedString(@"This video is corrupted due to some network error. We suggest you to download again. Do you want to download it again?", nil) delegate:self cancelButtonTitle:NSLocalizedString(@"NO", nil) otherButtonTitles:NSLocalizedString(@"YES", nil),nil];
        [corruptVideoAlert show];
        [corruptVideoAlert release];
    }

Answer 1

我发现了类似的问题，我解决了这个问题。试试下面的代码:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerPlayingErrorNotification:) name:MPMoviePlayerPlaybackDidFinishNotification object:playerViewController.moviePlayer];

 -(void)playerPlayingErrorNotification:(NSNotification*)notif
{

    NSNumber* reason = [[notif userInfo] objectForKey:MPMoviePlayerPlaybackDidFinishReasonUserInfoKey];
    switch ([reason intValue]) {
        case MPMovieFinishReasonPlaybackEnded:
            NSLog(@"Playback Ended");        
            break;
        case MPMovieFinishReasonPlaybackError:
            NSLog(@"Playback Error");
            [self performSelector:@selector(CorruptVideoAlertView) withObject:nil afterDelay:1.0];
            break;
        case MPMovieFinishReasonUserExited:
            NSLog(@"User Exited");
            break;
        default:
            break;
    }
}

如果它也适合您，请接受它。祝你有美好的一天。