Rotation issue on native iOS urn:3gpp:video-orientation

[Michael Siddi]

Hi, 

I'm facing a video rotation issue using the webrtc framework on an iOS device (iPhone 6S).

In my setup one peer is my iOS application while the other peer is Kurento Media Server.

The problem is that Kurento does not support the urn:3gpp:video-orientation extension so when my iOS peerconnection creates an SDP, before I set it as local description I remove the ext:4 urn:3gpp:video-orientation line from it but the video is still sent with a 90 degrees right rotation. The SDP answer from the other peer (kurento) does not have the extension as well.

So, my question is: shouldn't the webrtc framework correctly rotate the frames when the other peer does not  support the rotation extension? 

Is there a flag I have to set to enable the rotation?

Thank you very much!

Michael