From what I remember, I only used opi codecs and that's it. What I meant with the vendor change, was that I never run it nor allow it.

When you run zypper dup, it throws you some errors telling you that the versions are different or aren't in the official repo, which means that you should wait until there are no errors. Unless there was an official vendor change and you have no other alternative (and it's not really common) then you have to install those specific packages from the official repo.