[question] 'Value does not fall within the expected range.' exception

[levboy1]

Describe the bug

I am trying to implement a C# desktop application on Windows which is able to connect to a remote peer and establish a WebRTC call. After calling the PeerConnection.SetRemoteDescriptionAsync() method with the SDP answer I get this exception: 'Value does not fall within the expected range.'

To Reproduce

The remote peer is managed by a web API. The remote peer expects me to pass the SDP offer to the web API so I just simply print the SDP offer to the output and send it manually to the API in a HTTP message using Postman. I receive the SDP answer in the body of the successful HTTP answer. So I copy it to the console, then the program reads it from the standard input and parses it to an SdpMessage object.

I am trying to make a connection with the following flow:

1. I initialize the peer connection object with the PeerConnectionConfiguration. I use the STUN server of Google.
2. I add a data channel and an audio transreceiver to the peer connection object, then I add a local audio track to the transreceiver object.
3. I call the PeerConnection.CreateOffer() method.
4. When LocalSdpReadytoSend event is triggered I store the SDP to a global variable.
5. When IceCandidateReadytoSend event is triggered I concatenate a 'a={candidate}' line to the SDP offer for each candidate.
6. When IceGatheringState changes to complete I print the SDP offer to the console and I manually send the SDP to the web API.
7. I receive a successful answer from the API with the SDP answer, indicating the remote peer is ready to establish the connection.
8. I copy the SDP answer to the console so the program can read and parse it to an SdpMessage object.
9. After calling the SetRemoteDescriptionAsync() method the exception is thrown.

I have uploaded my code to a public repository so you can track step by step what I am trying to do:
https://github.com/levboy1/microsoft_mixedreality

SDP messages

Offer message

v=0 o=- 8795496105880237725 2 IN IP4 127.0.0.1 s=- t=0 0 a=group:BUNDLE audio data a=msid-semantic: WMS mrsw#0 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:20JD a=ice-pwd:JbJ1IiKjfEfpsgkNvDHlj9Wt a=ice-options:trickle a=fingerprint:sha-256 D0:FE:84:B4:90:0C:FA:A9:7A:AA:34:6A:D2:52:4F:35:9C:8D:E8:36:3C:17:65:40:81:74:F5:CA:BA:68:CB:91 a=setup:actpass a=mid:audio a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level 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:3462862450 cname:PkburLTo3Ytfmcfb a=ssrc:3462862450 msid:mrsw#0 437642e8-574b-4375-bd34-54efcec5a2b1 a=ssrc:3462862450 mslabel:mrsw#0 a=ssrc:3462862450 label:437642e8-574b-4375-bd34-54efcec5a2b1 m=application 9 DTLS/SCTP 5000 c=IN IP4 0.0.0.0 a=ice-ufrag:20JD a=ice-pwd:JbJ1IiKjfEfpsgkNvDHlj9Wt a=ice-options:trickle a=fingerprint:sha-256 D0:FE:84:B4:90:0C:FA:A9:7A:AA:34:6A:D2:52:4F:35:9C:8D:E8:36:3C:17:65:40:81:74:F5:CA:BA:68:CB:91 a=setup:actpass a=mid:data a=sctpmap:5000 webrtc-datachannel 1024 a=candidate:974510316 1 udp 2122260223 10.228.240.33 61827 typ host generation 0 ufrag 20JD network-id 1 a=candidate:948785377 1 udp 2122194687 192.168.0.154 61828 typ host generation 0 ufrag 20JD network-id 2 network-cost 10 a=candidate:974510316 1 udp 2122260223 10.228.240.33 61829 typ host generation 0 ufrag 20JD network-id 1 a=candidate:948785377 1 udp 2122194687 192.168.0.154 61830 typ host generation 0 ufrag 20JD network-id 2 network-cost 10 a=candidate:1955996700 1 tcp 1518280447 10.228.240.33 60286 typ host tcptype passive generation 0 ufrag 20JD network-id 1 a=candidate:1980673041 1 tcp 1518214911 192.168.0.154 60287 typ host tcptype passive generation 0 ufrag 20JD network-id 2 network-cost 10 a=candidate:1955996700 1 tcp 1518280447 10.228.240.33 60288 typ host tcptype passive generation 0 ufrag 20JD network-id 1 a=candidate:1980673041 1 tcp 1518214911 192.168.0.154 60289 typ host tcptype passive generation 0 ufrag 20JD network-id 2 network-cost 10 a=candidate:3116717653 1 udp 1685987071 80.98.2.199 61828 typ srflx raddr 192.168.0.154 rport 61828 generation 0 ufrag 20JD network-id 2 network-cost 10 a=candidate:3116717653 1 udp 1685987071 80.98.2.199 61830 typ srflx raddr 192.168.0.154 rport 61830 generation 0 ufrag 20JD network-id 2 network-cost 10 a=end-of-candidates

Answer message

v=0 o=rtcweb 1 1 IN IP4 127.0.0.1 s=- t=0 0 a=ice-lite m=audio 22948 RTP/SAVPF 111 110 c=IN IP4 199.87.123.94 a=ice-ufrag:l+UE a=ice-pwd:PAXI8kXVBo+N91F+8mGGgr5/ a=fingerprint:sha-256 FC:A8:9D:19:A1:0F:76:B5:65:56:B6:A4:8E:C3:2C:1E:F8:90:B7:BF:1B:08:A1:58:05:86:AC:78:E4:2D:A9:6A a=setup:passive a=sendrecv a=rtcp-mux a=rtcp:9 IN IP4 0.0.0.0 a=rtpmap:111 opus/48000/2 a=fmtp:111 minptime=10; useinbandfec=1 a=rtcp-fb:111 transport-cc a=rtpmap:110 telephone-event/48000 a=maxptime:60 a=candidate:0 1 UDP 2113667327 199.87.123.94 22948 typ host a=end-of-candidates a=ssrc:1192398718 cname:67be75c1-339e-4e48-ab65-5c5c6d2f65d7 a=ssrc:1192398718 msid:946e4825-0536-447f-82ec-962dd87fe724 3afca3af-565c-4dca-926a-29de8f0258f6 a=ssrc:1192398718 mslabel:946e4825-0536-447f-82ec-962dd87fe724 a=ssrc:1192398718 label:3afca3af-565c-4dca-926a-29de8f0258f6

Screenshots

Questions

After reading my summary you can easily tell by now that I am not really familiar with WebRTC and SDP attributes. I have read all earlier issues related to this exception and if I understand correctly the problem is the incompatibility of the SDP offer and answer. My questions are: What can cause this exception? There is no matching codec or ICE candidate in the offer and answer? Or I just made simply a wrong implementation?

Environment

• MR-WebRTC package version: 2.0.2
• Platform: Windows Desktop
• Target device: Windows Desktop
• .NET Core version: 3.1

[mango-martin]

Hey there. Did you find a solution for this? I am having a similar issue. "Value does not fall within the expected range." But I don't understand what's wrong.

Here's the offer that throws the error. Could anyone have a quick look to see if something's off in the message? I've tested a bunch with different codecs, etc. but it's always the same result.

data=v=0
o=mediasoup-client 10000 1 IN IP4 0.0.0.0
s=-
t=0 0
a=ice-lite
a=fingerprint:sha-512 CF:F8:FD:BB:B2:9D:48:A9:3B:61:9E:F9:04:C6:C2:B2:C7:67:9F:92:BF:FD:AE:AC:E1:F3:C8:9A:F7:18:65:16:22:7E:0A:5E:97:06:72:5A:0F:45:34:3A:36:A6:43:FC:40:C5:34:D0:A3:16:26:E2:C0:8B:07:73:20:12:42:44
a=msid-semantic: WMS *
a=group:BUNDLE 0 1
m=audio 7 UDP/TLS/RTP/SAVPF 111
c=IN IP4 127.0.0.1
a=rtpmap:111 opus/48000/2
a=fmtp:111 minptime=10;useinbandfec=1
a=setup:actpass
a=mid:0
a=msid:b65d595c b65d595c-audio
a=sendonly
a=ice-ufrag:2bp39odyjq6ixzip
a=ice-pwd:3gewute7gjvraoz6stzpvizg98o83hk7
a=candidate:udpcandidate 1 udp 1076302079 127.0.0.1 45339 typ host
a=candidate:udpcandidate 1 udp 1076276479 ::1 49630 typ host
a=candidate:udpcandidate 1 udp 1076250879 xxx.xx.xx.238 42917 typ host
a=end-of-candidates
a=ice-options:renomination
a=ssrc:126830276 cname:lamX5agvRn+k1TYf
a=rtcp-mux
a=rtcp-rsize
m=video 7 UDP/TLS/RTP/SAVPF 96 100
c=IN IP4 127.0.0.1
a=rtpmap:96 VP8/90000
a=rtpmap:100 rtx/90000
a=fmtp:100 apt=96
a=setup:actpass
a=mid:1
a=msid:b65d595c b65d595c-video
a=sendonly
a=ice-ufrag:2bp39odyjq6ixzip
a=ice-pwd:3gewute7gjvraoz6stzpvizg98o83hk7
a=candidate:udpcandidate 1 udp 1076302079 127.0.0.1 45339 typ host
a=candidate:udpcandidate 1 udp 1076276479 ::1 49630 typ host
a=candidate:udpcandidate 1 udp 1076250879 xxx.xx.xx.238 42917 typ host
a=end-of-candidates
a=ice-options:renomination
a=ssrc:711631981 cname:lamX5agvRn+k1TYf
a=ssrc:711631982 cname:lamX5agvRn+k1TYf
a=ssrc-group:FID 711631981 711631982
a=rtcp-mux
a=rtcp-rsize

I'm also not a WebRTC expert, so debugging without any indication of where the error might come from is really hard for me. With my limited knowledge of the SDP process and googling a bunch it seems the offer should pass.