I would say there is a semantic difference: * null/undefined: there is no a=fmtp line for this codec in the sdp * "": there is a a=fmtp line but its empty (which is probably a bad idea and there should be a test; but I don't think https://tools.ietf.org/html/rfc4566#section-6 forbids it) The first option would be clarified by adding "undefined is there is no fmtp line corresponding to the codec**s payload type** (you also have a typo in the title) -- GitHub Notification of comment by fippo Please view or discuss this issue at https://github.com/w3c/webrtc-stats/issues/588#issuecomment-722272970 using your GitHub account -- Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-configReceived on Thursday, 5 November 2020 09:59:57 UTC
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