thumbnailImageAtTime不准确

Question

我正在尝试创建一个应用程序，我在MPMoviePlayerController中播放视频。如果视频暂停，则会截取thumbnailImageAtTime的屏幕截图。问题是暂停后显示图像MPMoviePlayerController，而我用thumbnailImageAtTime获取的屏幕截图不一样。

我的代码如下所示：

[self.moviePlayer pause]
[self.moviePlayer thumbnailImageAtTime:self.moviePlayer.currentPlaybackTime timeOption:MPMovieTimeOptionExact];

Screenshot

非常感谢任何帮助：）

Answer 1

我使用的是MPMovieTimeOptionNearestKeyFrame

- (UIImage *)imageFromMovie:(NSURL *)movieURL atTime:(NSTimeInterval)time {
    // set up the movie player
    MPMoviePlayerController *mp = [[MPMoviePlayerController alloc] 
                                   initWithContentURL:movieURL];
    mp.shouldAutoplay = NO;
    mp.initialPlaybackTime = time;
    mp.currentPlaybackTime = time;
    // get the thumbnail
    UIImage *thumbnail = [mp thumbnailImageAtTime:time 
                                       timeOption:MPMovieTimeOptionNearestKeyFrame];
    // clean up the movie player
    [mp stop];
    [mp release];
    return(thumbnail);
}

试试这个