在iphone上获取流媒体视频的屏幕截图 [英] Get the screenshot of a streaming video on iphone

问题描述

如何在iphone上获取流媒体视频的屏幕截图。我尝试了几种方法。

How can i get the screenshot of a streaming video on iphone. I tried several methods.

1. UIGetScreenImage（） - >这是私有的。如果我使用它，该应用程序将被拒绝。

1. UIGetScreenImage() -> This is private. The app will be rejected if I use it.

UIGraphicsBeginImageContext（CGSizeMake（1024,768））;
[self.view.layer renderInContext：UIGraphicsGetCurrentContext（）];
UIImage * viewImage = UIGraphicsGetImageFromCurrentImageContext（）;
UIGraphicsEndImageContext（）;

UIGraphicsBeginImageContext(CGSizeMake(1024, 768)); [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext();

The code above cannot take the screenshot of video layer.

MPMoviePlayerController * movie = [[MPMoviePlayerController alloc]
initWithContentURL [NSURL URLWithString： @ myMovie.mp4]];
UIImage * singleFrameImage = [movie thumbnailImageAtTime：10
timeOption：MPMovieTimeOptionExact];

MPMoviePlayerController *movie = [[MPMoviePlayerController alloc] initWithContentURL [NSURL URLWithString:@"myMovie.mp4"]]; UIImage *singleFrameImage = [movie thumbnailImageAtTime:10 timeOption:MPMovieTimeOptionExact];

The code above does not work on a streaming video.

除了AVFoundation，我还能尝试什么？谢谢。

What else can I try besides AVFoundation. Thank you.

推荐答案

不确定它是否可行，但您尝试过使用AVPlayer吗？它应该允许您访问AVURLAsset，您可以将其传递给AVAssetImageGenerator。

Not sure if it will work, but have you tried using AVPlayer? It should give you access to AVURLAsset which you could pass to AVAssetImageGenerator.

AVPlayerItem *item = [AVPlayerItem playerItemWithURL:yourURL];
AVPlayer *player = [AVPlayer playerWithPlayerItem:pItem];

//observe 'status'
[playerItem addObserver:self forKeyPath:@"status" options:0 context:nil];

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
                        change:(NSDictionary *)change context:(void *)context
{ 
    if ([keyPath isEqualToString:@"status"]) {
        AVPlayerItem *item = (AVPlayerItem *)object;
        if (item.status == AVPlayerItemStatusReadyToPlay) {
            AVURLAsset *asset = (AVURLAsset *)item.asset;
            AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
            CGImageRef thumb = [imageGenerator copyCGImageAtTime:CMTimeMakeWithSeconds(10.0, 1.0)
                                                      actualTime:NULL
                                                           error:NULL];
        }
    }   
}

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