相关疑难解决方法(0)

如何让AVPlayer对象反向播放其视频内容？AVPlayerItem类有一个名为"reversePlaybackEndTime"的属性,这使我认为反向播放是可能的,但我似乎无法在文档中找到关于实际执行它的任何内容.

我正在开发一个 iPhone 应用程序，我需要反转视频播放。我目前正在使用 XCode 4.2。我正在尝试使用 MPMoviePlayerController 反向播放电影。但反向播放时就没有正向播放那么流畅。它变得有点断断续续，一点也不光滑。以下是我的代码。

- (void)viewDidLoad{
//code for initializing the movie player
MPMoviePlayerController videoPlayer = 
[[MPMoviePlayerController alloc] initWithContentURL:"URL"];
self.videoPlayer = videoPlayer;
[videoPlayer release];
self.videoPlayer.view.userInteractionEnabled = NO;
self.videoPlayer.initialPlaybackTime = -1;
self.videoPlayer.shouldAutoplay=NO;
[self.videoPlayer prepareToPlay];


//code for initializing the button 
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

[button setTitle:@"Reverse" forState:UIControlStateNormal];

[button addTarget:self 
action:@selector(reverseMovie) forControlEvents:UIControlEventTouchDown];

button.frame = CGRectMake(0, 0, 50, 40);

[self.view addSubview:button];
}

-(void)reverseMovie{
[self.videoPlayer setCurrentPlaybackRate:-1.0];
}

可能的解决方案是什么？