iOS获取视频所有图片

最新推荐文章于 2021-03-05 14:41:19 发布

转载最新推荐文章于 2021-03-05 14:41:19 发布 · 673 阅读

本文介绍了一种使用Objective-C从视频中按帧截取图片的方法。通过创建AVURLAsset对象并利用AVAssetImageGenerator来指定时间点获取图像，最终将生成的CGImageRef转换为UIImage保存。

AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:url options:nil];
AVAssetImageGenerator *generator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
generator.requestedTimeToleranceAfter =  kCMTimeZero;
generator.requestedTimeToleranceBefore =  kCMTimeZero;
for (Float64 i = 0; i < CMTimeGetSeconds(asset.duration) *  FPS ; i++){
  @autoreleasepool {
    CMTime time = CMTimeMake(i, FPS);
    NSError *err;
    CMTime actualTime;
    CGImageRef image = [generator copyCGImageAtTime:time actualTime:&actualTime error:&err];
    UIImage *generatedImage = [[UIImage alloc] initWithCGImage:image];
    [self saveImage: generatedImage atTime:actualTime]; // Saves the image on document directory and not memory
    CGImageRelease(image);
  }
}