iOS 对网络视频采集视频截图

//获取视频封面  videoURL:视频网络地址
- (UIImage*)thumbnailImageForVideo:(NSURL *)videoURL {
    
    AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:videoURL options:nil];
    
    AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset];
    
    gen.appliesPreferredTrackTransform = YES;
    
    CMTime time = CMTimeMakeWithSeconds(2.0, 600);
    
    NSError *error = nil;
    
    CMTime actualTime;
    
    CGImageRef image = [gen copyCGImageAtTime:time actualTime:&actualTime error:&error];
    
    UIImage *thumbImg = [[UIImage alloc] initWithCGImage:image];
    
    return thumbImg;
    
}