我正在尝试使用MPMoviePlayerController从选定的视频文件中提取多个图像。下面是我写的代码。movie=[[MPMoviePlayerControlleralloc]initWithContentURL:[infoobjectForKey:UIImagePickerControllerMediaURL]];NSNumber*time1=[NSNumbernumberWithInt:1];NSNumber*time2=[NSNumbernumberWithInt:3];NSNumber*time3=[NSNumbernumberWithInt:5];NSArray*ti