旋转视频从采摘的UIImagePickerController后上传到服务器

Question

所以，我已经看到了这些问题的答案和许多其他：

How to detect (iPhone SDK) if a video file was recorded in portrait orientation, or landscape.

How do I rotate a video from UIImagePickerController before uploading to a webserver

我知道如何让从视频的方向UIImagePickerController但我怎么实际上旋转图像选取器返回的视频网址，所以当我上传它没有旋转90度？

编辑：

我正在使用此方法来获取视频的方向。在我获得视频方向后，我如何将其旋转到返回的方向？

- (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; 
}