What steps will reproduce the problem?
1. Launch AppRTC Mobile on iOS device.
2. Select H264 codec in settings.
3. Enter a room from iOS when device is in portrait orientation.
4. Enter the same room from Chrome.
5. Open Javascript console in Chrome and paste the following code:

document.querySelectorAll('video').forEach(videoEl =>
    videoEl.addEventListener('resize', () => console.log(videoEl.id, videoEl.videoWidth, videoEl.videoHeight))
);

6. Rotate iOS device to landscape and back to portrait.

What is the expected result?
'resize' event is performed for remote video element and there is an output in Javascript console when iOS device is rotated to landscape and back:

remote-video 640 480
remote-video 480 640

What do you see instead?
Nothing happens, 'resize' is not called. Web app cannot adopt to video proportions change.

What version of the product are you using? On what operating system?
Desktop: macOS 10.12.5
Chrome version 59.0.3071.115 (Official Build) (64-bit)

Mobile: iOS 10.3.2
AppRTC Mobile built from the latest commit at the moment in master branch: 38fecafa48ff6abfdf0279ce3c04df7e26401e08

Please provide any additional information below.

It works as expected when using vp8 or vp9. Also works in Firefox.