视频需要很长时间才能在 iphone 中加载

Question

我正在尝试使用 MPMoviePlayerController 和 NSURL 从服务器播放视频。视频播放完美，但加载需要很多时间。以下是我的代码：

- (void) readyPlayer {
    mp =  [[MPMoviePlayerController alloc] initWithContentURL:movieURL];

    if ([mp respondsToSelector:@selector(loadState)]) {
        // Set movie player layout
        [mp setControlStyle:MPMovieControlStyleFullscreen];
        [mp setFullscreen:YES];

        // May help to reduce latency
        [mp prepareToPlay];

        // Register that the load state changed (movie is ready)
        [[NSNotificationCenter defaultCenter] addObserver:self           
                                                 selector:@selector(moviePlayerLoadStateChanged:) 
                                                     name:MPMoviePlayerLoadStateDidChangeNotification 
                                                   object:nil];
    }

    else{
        [[NSNotificationCenter defaultCenter] addObserver:self 
                                                 selector:@selector(moviePreloadDidFinish:) 
                                                     name:MPMoviePlayerContentPreloadDidFinishNotification 
                                                   object:nil];
    }

    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(moviePlayBackDidFinish:) 
                                                 name:MPMoviePlayerPlaybackDidFinishNotification 
                                               object:nil];
}



- (void) moviePlayerLoadStateChanged:(NSNotification*)notification {
    [lblActivity removeFromSuperview];
    [activity stopAnimating];
    // Unless state is unknown, start playback
    if ([mp loadState] != MPMovieLoadStateUnknown)
    {
        // Remove observer        
        [[NSNotificationCenter  defaultCenter] 
         removeObserver:self
         name:MPMoviePlayerLoadStateDidChangeNotification 
         object:nil];
        [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:NO];

        // Rotate the view for landscape playback      
        [[self view] setBounds:CGRectMake(0, 0, 480, 320)];
        [[self view] setCenter:CGPointMake(160, 240)];
        [[self view] setTransform:CGAffineTransformMakeRotation(M_PI / 2)]; 

        // Set frame of movieplayer
        [[mp view] setFrame:CGRectMake(0, 0, 480, 320)];

        // Add movie player as subview
        [[self view] addSubview:[mp view]];   

        // Play the movie
        [mp play];
    }
}

有人可以帮我弄清楚为什么加载需要这么多时间吗？

谢谢
潘卡伊

Answer 1

我假设这显然不是您手机上的互联网连接的问题。您是否尝试从您的应用和其他原生应用（例如 YouTube 或 Safari）在手机上加载相同的视频，看看是否有区别？

查看我们完成的类似代码，我想知道是否需要显式调用[mp prepareToPlay]; 方法。它在调用play 时自动调用，所以我们没有明确这样做。可以不用这个方法试试看有没有区别？

希望这会有所帮助！