Rotating Video with AVMutableVideoCompositionLayerInstruction

Question

I\'m shooting video on an iPhone 4 with the front camera and combining the video with some other media assets. I\'d like for this video to be portrait orientation - the default

Answer 1

Try this:

AVMutableVideoCompositionLayerInstruction *passThroughLayer = AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
CGAffineTransform rotationTransform = CGAffineTransformMakeRotation(degreesToRadians(90.0));
CGAffineTransform rotateTranslate = CGAffineTransformTranslate(rotateTransform,320,0);
[passThroughLayer setTransform:rotateTranslate atTime:kCMTimeZero];

Essentially the idea is to create a rotation and translation matrix. You rotate it to the proper orientation and then translate it into the view. I did not see any way to specify a center point while I was glancing through the API.