rtpmp4vpay: API change: config-interval changed from uint to int
CC @tpm @den_erpel
Commit in question is d365c4fd but there seems to be no MR related to it (why?).
Changing a property type is always an API change, even if weakly typed languages like C don't care about that if the types are of the same size (unless you happen to use the GValue API).