ios 獲得本地視頻的幀數的截圖

ios 本地視頻文件截圖，有的類已經deprecated，提供三個函數以供使用

+ (UIImage*)getVideoThumbnailWithUrl:(NSURL*)videoUrl  second:(CGFloat)second size:(CGSize)size
{
    if (!videoUrl)
    {
        NSLog(@"WARNING:videoUrl為空");
        return nil;
    }
    AVURLAsset *urlSet = [AVURLAsset assetWithURL:videoUrl];
    AVAssetImageGenerator *imageGenerator = [AVAssetImageGenerator assetImageGeneratorWithAsset:urlSet];
    imageGenerator.appliesPreferredTrackTransform = YES;
    imageGenerator.apertureMode = AVAssetImageGeneratorApertureModeEncodedPixels;
    
    /*
     如果不需要獲取縮略圖，就設置為NO，如果需要獲取縮略圖，則maximumSize為獲取的最大尺寸。
     以BBC為例，getThumbnail = NO時，打印寬高數據為：1920*1072。
     getThumbnail = YES時，maximumSize為100*100。打印寬高數據為：100*55.
     注：不乘[UIScreen mainScreen].scale，會發現縮略圖在100*100很虛。
     */
    BOOL getThumbnail = YES;
    if (getThumbnail)
    {
        CGFloat width = [UIScreen mainScreen].scale * size.width;
        CGFloat height = [UIScreen mainScreen].scale * size.height;
        imageGenerator.maximumSize =  CGSizeMake(height, width);
    }
    NSError *error = nil;
    CMTime time = CMTimeMake(second,k_FPS);
    CMTime actucalTime;
    CGImageRef cgImage = [imageGenerator copyCGImageAtTime:time actualTime:&actucalTime error:&error];
    if (error) {
        NSLog(@"ERROR:獲取視頻圖片失敗,%@",error.domain);
    }
    CMTimeShow(actucalTime);
    UIImage *image = [UIImage imageWithCGImage:cgImage];
    NSLog(@"imageWidth=%f,imageHeight=%f",image.size.width,image.size.height);
    CGImageRelease(cgImage);
    return image;
}


+(UIImage*)getVideoImageWithUrl:(NSURL*)videoUrl second:(CGFloat)second{
    MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc]initWithContentURL:videoUrl];
    moviePlayer.shouldAutoplay = NO;
    UIImage *thumbnail = [moviePlayer thumbnailImageAtTime:second timeOption:MPMovieTimeOptionNearestKeyFrame];
    return thumbnail;
}

+(UIImage*)getFristFrameImageWithUrl:(NSURL*)videoUrl{
    MPMoviePlayerController *mp = [[MPMoviePlayerController alloc]
                                   initWithContentURL:videoUrl];
    UIImage *img = [mp thumbnailImageAtTime:0.0
                                 timeOption:MPMovieTimeOptionNearestKeyFrame];
    [mp stop];
    return img;
}

第一個函數的size填你得視頻的尺寸為最佳