1v=0 2o=- 0 0 IN IP4 127.0.0.1 3s=WebRTC.rs 4c=IN IP4 127.0.0.1 5t=0 0 6m=audio 4000 RTP/AVP 111 7a=rtpmap:111 OPUS/48000/2 8m=video 4002 RTP/AVP 96 9a=rtpmap:96 VP8/90000