iOS 取出视频的第一帧

废话不多说，直接上代码

- (UIImage *)firstFrameWithVideoURL:(NSURL *)url size:(CGSize)size
{
    // 获取视频第一帧
    NSDictionary *opts = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
    AVURLAsset *urlAsset = [AVURLAsset URLAssetWithURL:url options:opts];
    AVAssetImageGenerator *generator = [AVAssetImageGenerator assetImageGeneratorWithAsset:urlAsset];
    generator.appliesPreferredTrackTransform = YES;
    generator.maximumSize = CGSizeMake(size.width, size.height);
    NSError *error = nil;
    CGImageRef img = [generator copyCGImageAtTime:CMTimeMake(0, 10) actualTime:NULL error:&error];
    if (error == nil)
    {
        return [UIImage imageWithCGImage:img];
    }
    return nil;
}