关于物镜c：截屏未在视频中显示图像

Screenshot does not show the image in video

我需要单击按钮才能获得视频的屏幕截图。下面是用于该代码的代码，但是该图像仅显示了视频的底部，即随着时间的流逝而进行的播放和进度。已使用MPMoviePlayerController播放视频。

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CGRect rect = [_moviePlayer.view bounds];
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[_moviePlayer.view.layer renderInContext:context];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 100, 100, 100)];
[imgView setImage:image];
imgView.layer.borderWidth = 2.0;
[_firstimage addSubview:imgView];

NSURL * url = [NSURL URLWithString：@" http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8"];

enter

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CGImageRef originalImage = UIGetScreenImage();
CGImageRef videoImage = CGImageCreateWithImageInRect(originalImage, CGRectMake(0, 0, 680, 300));
UIImage *snapShotImage = [UIImage imageWithCGImage:videoImage];
UIImageWriteToSavedPhotosAlbum(snapShotImage, nil, nil, nil);
CGImageRelease(originalImage);
CGImageRelease(videoImage);
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 100, 250, 200)];
[imgView setImage:snapShotImage];
imgView.layer.borderWidth = 2.0;
[_firstimage addSubview:imgView];

此代码有效...感谢您的帮助...

如何使用[MPMoviePlayerController requestThumbnailImagesAtTimes: timeOption:]？