我用它来获取视频的预览缩略图:-(void)createThumb{NSIntegerpaddingLeft=22;NSIntegerpaddingTop=22;CGFloatframeWidth=self.preview.frame.size.width-(2*paddingLeft);CGFloatframeHeight=self.preview.frame.size.height-(2*paddingTop);CGSizesize=CGSizeMake(frameWidth,frameHeight);MPMoviePlayerController*mp=[[MPMoviePlay