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

I found solution in Flutter plugin project.

- (CGAffineTransform)fixTransform:(AVAssetTrack*)videoTrack {
  CGAffineTransform transform = videoTrack.preferredTransform;

  if (transform.tx == 0 && transform.ty == 0) {
      NSInteger rotationDegrees = (NSInteger)round(radiansToDegrees(atan2(transform.b, transform.a)));
      NSLog(@"TX and TY are 0. Rotation: %ld. Natural width,height: %f, %f", (long)rotationDegrees,
      videoTrack.naturalSize.width, videoTrack.naturalSize.height);
      if (rotationDegrees == 90) {
        NSLog(@"Setting transform tx");
        transform.tx = videoTrack.naturalSize.height;
        transform.ty = 0;
      } else if (rotationDegrees == 270) {
        NSLog(@"Setting transform ty");
        transform.tx = 0;
        transform.ty = videoTrack.naturalSize.width;
     }
  }
  return transform;
}

// set layerInstruction
[firstVideoLayerInstruction setTransform:[self fixTransform:firstVideoAssetTrack] atTime:kCMTimeZero];

Flutter VideoPlayerPlugin