Question

I am developing an iPhone application where I need to reverse a video playback. I am currently using XCode 4.2. I am trying to play a movie in reverse with the MPMoviePlayerController. But when it plays in reverse it is not as smooth as playing it forward. It becomes a bit choppy and is not at all smooth. The following is my code.

- (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];
}

如何解决这一问题?

Answer 1

我试图在AVFoundation中这样做。在我设法开展工作之前,我不得不做很多工作。

我所做的是造影、推翻订单、将其带给一名资产监察员、出口录像然后播放。

https://github.com/mikaelhellqvist/ReverseClip” rel=“noreferer”https://github.com/mikaelhellqvist/ReverseClip。

Answer 2

AVPlayer

 avPlayer.rate=-1.0f;

这将使录像机能顺利播放。

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