iphone - 从 UIImagePickerController 选择后旋转视频以上传到服务器

Question

所以我已经看到了这些答案和许多其他答案：

如何检测 (iPhone SDK) 视频文件是以纵向还是横向录制的。

如何在上传到网络服务器之前从 UIImagePickerController 旋转视频

我了解如何从 UIImagePickerController 获取视频的方向，但是如何实际旋转 Image Picker 返回的视频 url，以便在上传时它不会旋转 90 度？

编辑：

我正在使用这种方法来获取视频的方向。获得视频方向后，如何将其实际旋转到返回的方向？

- (UIInterfaceOrientation)orientationForTrack:(AVAsset *)asset
{
AVAssetTrack *videoTrack = [[asset      tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
CGSize size = [videoTrack naturalSize];
CGAffineTransform txf = [videoTrack preferredTransform];

if (size.width == txf.tx && size.height == txf.ty)
    return UIInterfaceOrientationLandscapeRight;
else if (txf.tx == 0 && txf.ty == 0)
    return UIInterfaceOrientationLandscapeLeft;
else if (txf.tx == 0 && txf.ty == size.width)
    return UIInterfaceOrientationPortraitUpsideDown;
else
    return UIInterfaceOrientationPortrait;
}

Answer 1

- (UIImageOrientation)getImageOrientationWithVideoOrientation:(UIInterfaceOrientation)videoOrientation {
UIImageOrientation imageOrientation;
switch (videoOrientation) {
    case UIInterfaceOrientationLandscapeLeft:
        imageOrientation = UIImageOrientationUp;
        break;
    case UIInterfaceOrientationLandscapeRight:
        imageOrientation = UIImageOrientationDown;
        break;
    case UIInterfaceOrientationPortrait:
        imageOrientation = UIImageOrientationRight;
        break;
    case UIInterfaceOrientationPortraitUpsideDown:
        imageOrientation = UIImageOrientationLeft;
        break;
}
return imageOrientation;
}