Objective-c – Get the screenshot of a streaming video on iphone

ipadiphoneobjective c

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

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

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

    The code above does not work on a streaming video.

What else can I try besides AVFoundation. Thank you.

Best Answer

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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