can't handle the retransmission RTP packet

[legal-username]

Your environment.

• Version: v3.0.12
• Browser: chrome M88 (newest)
• Other Information - web publish steam(audio,video, datachannel) to pion.

What did you do?

When the first nack triggers the sender to retransmit, a new stream will be called back up in PeerConnection.undecaredMediaProcessor(), and pc.api.mediaEngine.negotiatedHeaderExtensions is nil in handleUndeclaredSSRC() function, so you can got a error report: "pc ERROR: 1999/10/14 09:14:23 Incoming unhandled RTP ssrc(1184720791), OnTrack will not be fired. mid RTP Extensions required for Simulcast"

What did you expect?

did i miss some? should i create mediaEngine add to peerconnection?

[Sean-Der]

Hey @pig-peppa

Thanks for a report, this is a known issue #1675. It would be great if someone offered to take it! I am currently working on WebRTC for the Curious for a few weeks.

thanks