[Webkit-unassigned] [Bug 215567] New: calling transceiver setCodecPreferences doesn't change the order of codecs in the offer/answer generated by the browser

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215567

            Bug ID: 215567
           Summary: calling transceiver setCodecPreferences doesn't change
                    the order of codecs in the offer/answer generated by
                    the browser
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jaya.allamsetty at 8x8.com
                CC: youennf at gmail.com

On STP 111, I am trying to change the default order of codecs in the offer/answer SDP by calling setCodecPreferences on the video transceiver.
It doesn't seem to have any effect on the order of the codecs in the subsequent offer/answer generated by the browser.
setCodecPreferences is working on Chrome 85 in Unified plan.

Steps to reproduce:
Modify https://webrtc.github.io/samples/src/content/peerconnection/pc1/ to include the following line before calling offer on pc1.

//localStream.getTracks().forEach(track => pc1.addT(track, localStream));
const audio = pc1.addTransceiver('audio', localStream.getAudioTracks()[0]);
const video = pc1.addTransceiver('video', localStream.getVideoTracks()[0]);
const capabilities = RTCRtpSender.getCapabilities('video').codecs;

capabilities.forEach((codec, idx) => {
  if (codec.mimeType === 'video/VP8') {
    capabilities.splice(idx, 1);
    capabilities.unshift(codec);
  }
});
video.setCodecPreferences(capabilities);

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