Allow multiple negotiated A/V codecs respectively #2632
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Description
Pion currently restricts the negotiated audio codec and negotiated video codec to the first exact / partial matches it finds in a remote description.
This causes issues in the following scenario:
RegisterCodec()
.AddTransceiver()
for multiple video codecs / multiple audio codecs.SetRemoteDescription()
=> This updates the list of negotiated codecs.CreateAnswer()
.SetLocalDescription
=> There is a conflict here between what transceivers have been configured and the negotiated codecs filtered down from the remote description.Reference issue
Fixes #...