Dear Slack,
There has been quite some buzz this week about you and WebRTC.
WebRTC… kind of. Because actually you only do stuff in Chrome and your native apps:
I’ve been there. Launching stuff only for Chrome. That was is late 2012. In 2016, you need to have a very good excuse to launch something with WebRTC and not support Firefox like this:
Maybe you had your reasons. As usual, I tried to get a dump from chrome://webrtc-internals to see what is going on. Thanks to Dag-Inge Aas for providing one. The most interesting bit is the call to setRemoteDescription:
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type: answer, sdp: v=0 o=- 1242503183783 1242503183783 IN IP4 127.0.0.1 s=Room with no name.. t=0 0 a=group:BUNDLE audio a=msid-semantic: WMS janus m=audio 1 RTP/SAVPF 111 c=IN IP4 10.9.4.95 a=mid:audio a=recvonly a=rtcp-mux a=ice-ufrag:rKmT a=ice-pwd:AOrIm8kDxew5sVNUCQrrmJ a=ice-options:trickle a=fingerprint:sha-256 C5:5F:DA:7D:84:47:B1:BF:6B:55:16:62:48:31:3E:D3:F1:7B:25:89:92:4A:4B:4D:4D:D9:D5:AF:EA:D8:15:44 a=setup:active a=connection:new a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level a=rtpmap:111 opus/48000/2 a=fmtp:111 minptime=10; useinbandfec=1; usedtx=1 a=candidate:1 1 udp 2013266431 10.9.4.95 12000 typ host a=candidate:2 1 udp 2013266431 172.31.0.190 12000 typ host |
I would like to note that you reply to Chrome’s offer of UDP/TLS/RTP/SAVPF with a profile of RTP/SAVPF. While that is still tolerated by browsers, it is improper.
Your a=msid-semantic line looks very interesting. “WMS janus”. Sounds familiar, this is meetecho’s janus gateway (see Lorenzo’s post on gateways here). Which by the way works fine with Firefox from what I hear.
