I could not find the edit button so I'll just post here. I forgot to mention that I was using AMF in the previous version of OBS. I think this was my last stable configuration:
What's the equivalent to this in OBS 28? I can't pick that particular encoder anymore.
As it's stated on the release notes in OBS 28 there's a new AMD encoder.
Do the intelligent thing and run the Auto-configuration Wizard, apply the settings it gives, restart OBS and test.