ios 获取视频截图

#pragma mark -- 获取视频截图
- (UIImage *)getThumbnailImage:(NSString *)videoURL{
    AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:[NSURL fileURLWithPath:videoURL] options:nil];
   
    AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset];
   
    gen.appliesPreferredTrackTransform = YES;//按正确方向对视频进行截图,关键点是将AVAssetImageGrnerator对象的appliesPreferredTrackTransform属性设置为YES。
   
    CMTime time = CMTimeMakeWithSeconds(5, 600);
   
    NSError *error = nil;
   
    CMTime actualTime;
   
    CGImageRef image = [gen copyCGImageAtTime:time actualTime:&actualTime error:&error];
   
    UIImage *thumb = [[UIImage alloc] initWithCGImage:image];
   
    CGImageRelease(image);
   
    return thumb; 

}