iphone - 在 iPhone 上获取流媒体视频的屏幕截图

Question

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。

1. UIGetScreenImage() -> 这是私有(private)的。如果我使用该应用程序，它将被拒绝。

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

   The code above cannot take the screenshot of video layer.
   

3. MPMoviePlayerController *movie = [[MPMoviePlayerController 分配] initWithContentURL [NSURL URLWithString:@"myMovie.mp4"]]; UIImage *singleFrameImage = [movie thumbnailImageAtTime:10 时间选项:MPMovieTimeOptionExact];

   The code above does not work on a streaming video.
   

除了 AVFoundation，我还能尝试什么。谢谢。

Answer 1

不确定它是否有效，但您是否尝试过使用 AVPlayer？它应该允许您访问 AVURLAsset，您可以将其传递给 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];
        }
    }   
}