Some WebRTC implementations such as Pion are unhappy if the profile-level-id isn't returned with a compatible profile as the RFC requires. Let's try to reform it In practice, the correct way to do this would be to not use caps intersection, but to instead implement the correct RFC compliant SDP O/A negotiation of formats. Include a unit test written by Philippe Normand Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9031>