It’s very easy, but I couldn’t find these steps anywhere else, so I’d like to share it here:
- Add the RPM Fusion free repo:
rpm-ostree install https://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm
- Reboot the system
- Install the
compat-ffmpeg28
package (yes, even on Silverblue 29):rpm-ostree install compat-ffmpeg28
- Reboot again
That’s for the SB 29 pre-installed Firefox. Firefox Nightly flatpak includes H.264 support out of the box.