AVFoundation exporting orientation wrong

Question

I\'m attempting to combine an image and a video. I have them combining and exporting however it\'s rotated side ways.

Sorry for the bulk code paste. I\'ve seen answers

Answer 1

Maybe U should check the videoTrack's preferredTransform so to give it a exact renderSize and transform:

CGAffineTransform transform = assetVideoTrack.preferredTransform;
CGFloat rotation = [self rotationWithTransform:transform]; 
//if been rotated
        if (rotation != 0)
        {
            //if rotation is 360°
            if (fabs((rotation - M_PI * 2)) >= valueOfError) {

                CGFloat m = rotation / M_PI;
                CGAffineTransform t1;
                //rotation is 90° or 270°
                if (fabs(m - 1/2.0) < valueOfError || fabs(m - 3/2.0) < valueOfError) {
                    self.mutableVideoComposition.renderSize = CGSizeMake(assetVideoTrack.naturalSize.height,assetVideoTrack.naturalSize.width);
                    t1 = CGAffineTransformMakeTranslation(assetVideoTrack.naturalSize.height, 0);
                }
                //rotation is 180°
                if (fabs(m - 1.0) < valueOfError) {
                    t1 = CGAffineTransformMakeTranslation(assetVideoTrack.naturalSize.width, assetVideoTrack.naturalSize.height);
                }
                CGAffineTransform t2 = CGAffineTransformRotate(t1,rotation);
                //                CGAffineTransform transform = makeTransform(1.0, 1.0, 90, videoTrack.naturalSize.height, 0);
                [passThroughLayer setTransform:t2 atTime:kCMTimeZero];
            }
        }

//convert transform to radian
- (CGFloat)rotationWithTransform:(CGAffineTransform)t
{
    return atan2f(t.b, t.a);
}