Hi,
I work in an android app where we use OpenVidu CE.
We implemented the OpenVidu RPC ourselves and it works fine.
Now we are trying to switch to OpenVidu EE + mediasoup, but the same client code on our side doesn’t work any more. Basically we get an invalid/empty SDP answer from OpenVidu.
Example, this is the SDP offer I generate, sent through a publishVideo RPC message ( OpenVidu Docs ):
v=0
o=- 2600538386293608434 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE audio
a=extmap-allow-mixed
a=msid-semantic: WMS ARDAMS
m=audio 9 UDP/TLS/RTP/SAVPF 111 103 104 9 102 0 8 106 105 13 110 112 113 126
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:rH/D
a=ice-pwd:/F+k2ShsnZJpPLWk4tmwa1JC
a=ice-options:trickle renomination
a=fingerprint:sha-256 22:52:15:87:47:5F:A8:4D:13:C5:CF:B5:9A:A2:50:75:75:D3:C6:E7:3C:A2:76:B8:2D:CE:D9:C3:DF:C9:B2:86
a=setup:actpass
a=mid:audio
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:3 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=sendrecv
a=rtcp-mux
a=rtpmap:111 opus/48000/2
a=rtcp-fb:111 transport-cc
a=fmtp:111 minptime=10;useinbandfec=1
a=rtpmap:103 ISAC/16000
a=rtpmap:104 ISAC/32000
a=rtpmap:9 G722/8000
a=rtpmap:102 ILBC/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:106 CN/32000
a=rtpmap:105 CN/16000
a=rtpmap:13 CN/8000
a=rtpmap:110 telephone-event/48000
a=rtpmap:112 telephone-event/32000
a=rtpmap:113 telephone-event/16000
a=rtpmap:126 telephone-event/8000
a=ssrc:2172223321 cname:JInLmYIDM6Av/b0N
a=ssrc:2172223321 msid:ARDAMS ARDAMSa0
a=ssrc:2172223321 mslabel:ARDAMS
a=ssrc:2172223321 label:ARDAMSa0
The SDP answer I get back is this:
v=0
o=mediasoup-client 10000 1 IN IP4 0.0.0.0
s=-
t=0 0
a=ice-lite
a=fingerprint:sha-512 DC:8C:C9:FD:F8:FB:D1:D3:88:B5:6C:8C:06:43:BB:A3:42:EE:83:3E:FE:53:D4:D2:AD:C1:6E:38:C7:A0:3D:83:77:2E:FF:A7:84:A9:EC:AD:83:71:72:6B:CE:93:29:D2:30:3E:6F:03:A2:34:7A:1E:E6:74:CF:DC:54:96:CA:06
a=msid-semantic: WMS *
a=group:BUNDLE
And since it’s basically empty I fail when applying it locally to libwebrtc:
Peerconnection error: setSDP error: Failed to set remote answer sdp: The order of m-lines in answer doesn't match order in offer. Rejecting answer
Any clue on why I get this SDP and how to fix?
P.S. I noticed that configuring my webrtc PeerConnection as sendonly instead of sendrecv I get a valid SDP response. But I’m not able to try the functionality much further because our current code relies on sendrecv