+(UIImage *)getImage:(NSString *)videoURL
{
    NSDictionary *opts = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:AVURLAssetPreferPreciseDurationAndTimingKey];
   

    NSURL *url = [[[NSURL alloc] initFileURLWithPath:videoURL] autorelease];
   
    AVURLAsset *urlAsset = [AVURLAsset URLAssetWithURL:url options:opts];
   
    AVAssetImageGenerator *generator = [AVAssetImageGenerator assetImageGeneratorWithAsset:urlAsset];

    generator.appliesPreferredTrackTransform = YES;
    generator.maximumSize = CGSizeMake(600, 450);
   
    NSError *error = nil;
    CGImageRef img = [generator copyCGImageAtTime:CMTimeMake(10, 10) actualTime:NULL error:&error];
    UIImage *image = [UIImage imageWithCGImage: img];
   
    return image;
}

注意添加AVFoundation框架

摘自 進階碼農的專欄