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Switching from Nvidia to AMD Graphics
(sh.itjust.works)
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this post was submitted on 15 May 2024
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Hmmm. That's suspicious, there's a number of things in the way of video acceleration with that setup.
First of all, the fact that on fedora (ublue is a derivative of fedora) you need to install openh264 from dnf and not from Firefox extension manager, and then you still need to change some settings in about:config . Second, you are using a flatpak, I'm not sure if openh264 needs to be installed "inside the flatpak". And last, it might just be the Nvidia.
The first two would also affect AMD.
Just to clarify, I use Pop!_OS and not Fedora Ublue. I looked at their Wiki because they are the only ones who had documentation on how they made hw accel work with Flatpak and Nvidia specifically. More exaclty I was led there by this Reddit post.
AFAIK it should work fine with AMD since Firefox can use the VA-API FFmpeg Flatpak to provide hw accel which should work fine with AMD GPUs. This does however not support Nvidia GPUs, which is why you have to expose the driver in the sandbox and force Firefox to try to use it etc.