Fedora Kinoite, specifically the version from universal-blue.org.
It comes with all codecs (and even baked in Nvidia-driver if you want!).
Why that and not the normal (mutable) Fedora Workstation KDE spin?
- Very simple by default. You basically only "own" your home directory, the rest is indestructible and taken care of.
- Has less bugs due to better reproducibility, and if something major should break, you can easily roll back without any waiting time (as opposed to Tumbleweed)
- And you can even rebase to Bazzite, a gaming distro, that's based on the uBlue KDE version, or any other spin it you want cleanly