发挥2倍3倍4倍速度/前进视频 - iPhone SDK(Play/Forward video i

我想发挥的MPMoviePlayerController /转发视频以不同的速度。 任何一个可以建议我我如何做到这一点。

现在我做的快进（在单速），但在几秒钟后，回来就正常速度。

请建议。

Answer 1:

MPMoviePlayerController Conforms to MPMediaPlayback protocol 
you can see the property currentPlaybackRate as :-
@property(nonatomic) float currentPlaybackRate 
A value of 0 represents that the video is stopped , a value of 1 indicates normal speed and further positive values indicate increased speed while negative ones indicate reverse .

同时检查MPMediaPlayback您endseeking委托方法，因为它是恢复播放正常的唯一方法

Answer 2:

下面是转发代码和向后的电影为2倍3倍4倍速度MPMoviePlayerViewController

在.h文件

@property(nonatomic) float currentPlaybackRate;

在.m文件

- (void)viewDidLoad
{
    currentPlaybackRate=1.0; //video Play in Normal speed
}

现在，在快进和快退按钮操作

[fastForward addTarget:self action:@selector(fastForward) forControlEvents:UIControlEventTouchUpInside];

[fastBackWard addTarget:self action:@selector(fastBackward) forControlEvents:UIControlEventTouchUpInside];

操作代码

-(void)fastForward
{
    [mp.moviePlayer pause];
    playPauseButton.selected=TRUE;
    if (currentPlaybackRate < 0.0) {
        currentPlaybackRate = 1.0;
    }

    if (currentPlaybackRate < 4.0) {
        currentPlaybackRate=currentPlaybackRate+1.0;
        NSLog(@"Forward::%f",currentPlaybackRate);
        mp.moviePlayer.currentPlaybackRate=currentPlaybackRate;
    }
}
-(void)fastBackward
{
    [mp.moviePlayer pause];
    playPauseButton.selected=TRUE;

    if (currentPlaybackRate > 0.0) {
        currentPlaybackRate = 0.0;
    }


    if (currentPlaybackRate > -4.0) {
        currentPlaybackRate=currentPlaybackRate-1.0;
        NSLog(@"BackWard::%f",currentPlaybackRate);
        mp.moviePlayer.currentPlaybackRate=currentPlaybackRate;
    }
}

文章来源: Play/Forward video in 2x 3x 4x speed - iPhone SDK