v=0 o=- 0 0 IN IP4 127.0.0.1 s=Pion WebRTC c=IN IP4 127.0.0.1 t=0 0 m=audio 4000 RTP/AVP 111 a=rtpmap:111 OPUS/48000/2 m=video 4002 RTP/AVP 96 a=rtpmap:96 VP8/90000
