AVAssetImageGenerator提供旋转的图像 [英] AVAssetImageGenerator provides images rotated

问题描述

当通过AVAssetImageGenerator获取视频的UIImage时，当视频以纵向方向拍摄时，我会返回旋转的图像（技术上它们不是）。如何判断视频的拍摄方向，然后正确旋转图像？

When obtaining a UIImage of a video via AVAssetImageGenerator, I'm getting back images rotated (well, technically they're not) when the video is shot in portrait orientation. How can I tell what orientation the video was shot and then rotate the image properly?

AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:url options:nil];
AVAssetImageGenerator *generate = [[AVAssetImageGenerator alloc] initWithAsset:asset];
NSError *err = NULL;
CMTime time = CMTimeMake(0, 60);
CGImageRef imgRef = [generate copyCGImageAtTime:time actualTime:NULL error:&err];
[generate release];
UIImage *currentImg = [[UIImage alloc] initWithCGImage:imgRef];

推荐答案

最简单的方法是设置<$ c图像生成器上的$ c> applyPreferredTrackTransform 属性为YES，然后它会自动为您进行转换。

The easiest way is to just set the appliesPreferredTrackTransform property on the image generator to YES, then it should automatically do the transformation for you.

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