[Webkit-unassigned] [Bug 251017] [GStreamer] VA-API (GstVA) hardware-accelerated video decoding playback above 1080p resolution on YouTube in VP9 is very slow and stutters

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251017

Michael Catanzaro <mcatanzaro at gnome.org> changed:

           What    |Removed                     |Added
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                 CC|                            |mcatanzaro at gnome.org

--- Comment #1 from Michael Catanzaro <mcatanzaro at gnome.org> ---
(In reply to Jeff Fortin from comment #0)
> * On Fedora, it might be that the gstva plugin is part of this package (I'm
> not sure), so I did: `dnf install gstreamer1-plugins-bad-*-extras`. Make
> sure to also have `libva libva-utils libva-intel-driver` and `igt-gpu-tools`
> (to have the `intel_gpu_top` commandline utility available)

You're using flatpak, so host system packages do not matter. Host system code is not going to be used at all (except for certain host services, not relevant here).

> * Grab Epiphany.Devel from gnome-nightly as a flatpak, and then run it like
> this (loosely based on
> https://blogs.igalia.com/vjaquez/2021/12/08/gstva-in-gstreamer-1-20/ ):
> 
> `flatpak run
> --env=GST_PLUGIN_FEATURE_RANK=vah264dec:MAX,vah265dec:MAX,vampeg2dec:MAX,
> vavp8dec:MAX,vavp9dec:MAX org.gnome.Epiphany.Devel`
> 
> ...then try to play https://www.youtube.com/watch?v=mBw7vkcQOew at a
> resolution higher than 1080p.

You may also need to install a VAAPI flatpak extension. I'm told this happens by default for Intel but not for AMD users? Who knows about NVIDIA.

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