Lasse Lumiaho :
I think you would need to munge SDP to make it happen. To my understanding the idea is that the endpoints negotiate the best possible codecs to be used.\n\nThe VP9 release news has some hints on how to change the preferred codec from VP8 to VP9 https://developers.google.com/web/updates/2016/01/vp9-webrtc?hl=en.",
2016-06-29T07:31:35