如何通过mpmovieplayercontroller减少播放m3u8视频的延迟

Question

我通过ipad中的mpmovieplayercontroller播放m3u8 url（即来自Wowza Streaming Engine）。但最初我可以观察播放视频的延迟。请帮助我如何减少播放视频的延迟时间。

这是我的代码：

urlStr=@"http://192.168.1.14:1935/live/teststream/playlist.m3u8";
NSURL *url = [NSURL URLWithString:urlStr];

videoPlayer = [[MPMoviePlayerController alloc] initWithContentURL:url];
[videoPlayer prepareToPlay];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(doneButtonClicked:) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(MPMoviePlayerDidExitFullscreen:) name:MPMoviePlayerDidExitFullscreenNotification object:nil];

videoPlayer.movieSourceType = MPMovieSourceTypeStreaming;
[videoPlayer setShouldAutoplay:YES];
videoPlayer.controlStyle=MPMovieScalingModeAspectFit;
//[videoPlayer prepareToPlay];
[_session.previewView addSubview:videoPlayer.view];
[_session.previewView bringSubviewToFront:videoPlayer.view];
videoPlayer.view.frame = CGRectMake(0, 0,768, 512);

[videoPlayer play];

请帮我解决此问题。