SCAssetExportSession watermark orientation bug

[pingguoilove]

I found a bug when export a video file which import from album, the water mark orientation is wrong

[realcarlos]

me too, is there any solutions?

[pingguoilove]

@realcarlos No

[pixelmatrix]

The reason for the different behavior is that portrait videos from the camera roll are actually landscape videos that have a transform applied to them as part of their metadata. The segments recorded by SCRecorder are actually portrait dimensions.

I solved this locally by:

1. enabling keepInputAffineTransform (passes through the transform to the export session)
2. disabling translatesFilterIntoComposition (seems the composition doesn't respect the transform)
3. in the _buildWatermarkFilterForVideoSize method of SCAssetExportSession, just before drawing in the graphics context, I added this:

CGAffineTransform affineTransform = _videoInput.transform;
CGAffineTransform invertedTransform = CGAffineTransformInvert(affineTransform);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextConcatCTM(context, invertedTransform);

I can't guarantee this will work for everyone, but it worked for me. Hope this helps someone.