thumbnailImageAtTime不準確

Question

我想創建一個應用程序，我有一個在MPMoviePlayerController內播放視頻。如果視頻暫停，則屏幕截圖爲thumbnailImageAtTime。問題是暫停後圖像MPMoviePlayerController顯示，我用thumbnailImageAtTime得到的屏幕截圖不一樣。

我的代碼如下所示：

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

Screenshot

任何幫助，高度讚賞:)

Answer 1

我用的是什麼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); 
} 

試試這個