////獲取本地視頻縮略圖
AVFoundation.framework
//- (UIImage *)getImage:(NSURL *)URL{
//
//    AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:URL options:nil];
//    AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset];
//    gen.appliesPreferredTrackTransform = YES;
//    CMTime time = CMTimeMakeWithSeconds(0.0, 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;
//}