[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

--- Comment #8 from Jeff Fortin <nekohayo at gmail.com> ---
> You may also need to install a VAAPI flatpak extension. [...]

I forgot to mention more clearly that I was running intel_gpu_top at the same time, and saw that the video decoder was showing activity; anything other than 0.00% means hardware decoding acceleration is happening/working, so it is an indicator for me that the flatpaked Epiphany was indeed using the hardware.

> On this old laptop I don't think 4K playback will ever work TBH.

I don't see why it wouldn't work with 4K playback, if your laptop's chipset is indeed Coffee Lake, and advertises VP9 support etc… it's one generation newer than mine (Kaby Lake)!

On mine, Firefox has zero problems playing this video with VP9 hardware acceleration on my test machine, in 4K (both the screen and the video); while it does so, intel_gpu_top reports about 30% "video" utilization, and htop reports about 15 to 35% CPU usage for each core.

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