Hi, I created a media stream with a video track and then later added a new audio track to it.
Firefox 66 generates an offer as below v=0 o=mozilla...THIS_IS_SDPARTA-66.0 6649649757650455613 0 IN IP4 0.0.0.0 s=- t=0 0 a=sendrecv a=fingerprint:sha-256 E6:9C:12:F9:51:3E:FB:66:08:A6:E5:A7:44:3E:C4:2E:4D:5A:65:6F:9F:11:37:5C:B3:6D:70:73:78:78:93:1D a=group:BUNDLE 0 1 a=ice-options:trickle a=msid-semantic:WMS * m=video 42914 UDP/TLS/RTP/SAVPF 120 121 126 97 c=IN IP4 192.168.144.87 a=candidate:0 1 UDP 2122252543 10.0.2.15 53714 typ host a=sendrecv a=end-of-candidates a=extmap:3 urn:ietf:params:rtp-hdrext:sdes:mid a=extmap:4 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time a=extmap:5 urn:ietf:params:rtp-hdrext:toffset a=fmtp:126 profile-level-id=42e01f;level-asymmetry-allowed=1;packetization-mode=1 a=fmtp:97 profile-level-id=42e01f;level-asymmetry-allowed=1 a=fmtp:120 max-fs=12288;max-fr=60 a=fmtp:121 max-fs=12288;max-fr=60 a=ice-pwd:885e51aa56ae2c53b752f3ff4b8aa665 a=ice-ufrag:b18867cf a=mid:0 a=msid:{cb5b1692-3fc4-4398-bd15-389bbb562be4} {2a72737f-edc9-4db8-b425-7654677d2bb8} a=rtcp:40059 IN IP4 192.168.144.87 a=rtcp-fb:120 nack a=rtcp-fb:120 nack pli a=rtcp-fb:120 ccm fir a=rtcp-fb:120 goog-remb a=rtcp-fb:121 nack a=rtcp-fb:121 nack pli a=rtcp-fb:121 ccm fir a=rtcp-fb:121 goog-remb a=rtcp-fb:126 nack a=rtcp-fb:126 nack pli a=rtcp-fb:126 ccm fir a=rtcp-fb:126 goog-remb a=rtcp-fb:97 nack a=rtcp-fb:97 nack pli a=rtcp-fb:97 ccm fir a=rtcp-fb:97 goog-remb a=rtcp-mux a=rtpmap:120 VP8/90000 a=rtpmap:121 VP9/90000 a=rtpmap:126 H264/90000 a=rtpmap:97 H264/90000 a=setup:actpass a=ssrc:2641968431 cname:{8ec0a58b-8dc5-4bc9-94d8-6296f47ec46d} m=audio 41219 UDP/TLS/RTP/SAVPF 109 9 0 8 101 c=IN IP4 192.168.144.87 a=candidate:0 1 UDP 2122252543 10.0.2.15 53716 typ host a=sendrecv a=end-of-candidates a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level a=extmap:2/recvonly urn:ietf:params:rtp-hdrext:csrc-audio-level a=extmap:3 urn:ietf:params:rtp-hdrext:sdes:mid a=fmtp:109 maxplaybackrate=48000;stereo=1;useinbandfec=1 a=fmtp:101 0-15 a=ice-pwd:885e51aa56ae2c53b752f3ff4b8aa665 a=ice-ufrag:b18867cf a=mid:1 a=msid:{cb5b1692-3fc4-4398-bd15-389bbb562be4} {f9022aba-9e72-43fb-b079-8f835482c1cf} a=rtcp:44757 IN IP4 192.168.144.87 a=rtcp-mux a=rtpmap:109 opus/48000/2 a=rtpmap:9 G722/8000/1 a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=setup:actpass a=ssrc:418481083 cname:{8ec0a58b-8dc5-4bc9-94d8-6296f47ec46d} This is the answer generate by Janus v=0 o=- 1553073400 1553073401 IN IP4 192.168.251.62 s=ect t=0 0 a=group:BUNDLE 1 0 a=msid-semantic: WMS janus m=audio 9 UDP/TLS/RTP/SAVPF 8 c=IN IP4 192.168.251.62 a=rtpmap:8 PCMA/8000 a=sendrecv a=mid:1 a=rtcp-mux a=ice-ufrag:FRNK a=ice-pwd:HHKPDngakgsincsuubCf4g a=ice-options:trickle a=fingerprint:sha-256 D2:B9:31:8F:DF:24:D8:0E:ED:D2:EF:25:9E:AF:6F:B8:34:AE:53:9C:E6:F3:8F:F2:64:15:FA:E8:7F:53:2D:38 a=setup:active a=ssrc:91094205 cname:janus a=ssrc:91094205 msid:janus janusa0 a=ssrc:91094205 mslabel:janus a=ssrc:91094205 label:janusa0 a=candidate:1 1 udp 1000 192.168.251.62 38330 typ host a=end-of-candidates m=video 9 UDP/TLS/RTP/SAVPF 120 c=IN IP4 192.168.251.62 b=AS:1524 a=rtpmap:120 VP8/90000 a=recvonly a=mid:0 a=rtcp-mux a=ice-ufrag:FRNK a=ice-pwd:HHKPDngakgsincsuubCf4g a=ice-options:trickle a=fingerprint:sha-256 D2:B9:31:8F:DF:24:D8:0E:ED:D2:EF:25:9E:AF:6F:B8:34:AE:53:9C:E6:F3:8F:F2:64:15:FA:E8:7F:53:2D:38 a=setup:active a=rtcp-fb:120 goog-remb a=rtcp-fb:120 transport-cc a=rtcp-fb:120 ccm fir a=rtcp-fb:120 nack a=rtcp-fb:120 nack pli a=ssrc:3901434987 cname:janus a=ssrc:3901434987 msid:janus janusv0 a=ssrc:3901434987 mslabel:janus a=ssrc:3901434987 label:janusv0 a=candidate:1 1 udp 1000 192.168.251.62 38330 typ host a=end-of-candidates Setting remote description fails with an error - InvalidSessionDescriptionError: Answer and offer have different media types at m-line 0 Here does the order of media cause this error on Firefox? The answer generated has the 'mid' attributes assigned to the right media - mid 0 for video and mid 1 for audio. But their order is interchanged and Firefox fails to accept it. I could create a mediastream with an audio track and then add video track which would work. Want to know if the order matters here as per specification. Note - Chrome always generates audio with mid 0 and video with mid 1 no matter in which order the tracks were added to the media stream _______________________________________________ dev-media mailing list dev-media@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-media
