[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 #20 from Jeff Fortin <nekohayo at gmail.com> ---
Created attachment 464656

  --> https://bugs.webkit.org/attachment.cgi?id=464656&action=review

screenshot of video graphics corruption when playing with dmabuf enforced

Running with WEBKIT_GST_DMABUF_SINK_ENABLED=1 (in addition to all the other gazillion env vars mentioned previously) results in total graphics corruption of the video; that said however, looking at the motion of the corrupt graphics, I can tell it's playing smoothly, at 30 fps at least, and the CPU usage is low (maybe 10-15% per core or so, and intel_gpu_top still shows "video" having non-zero percentage), so it's "working".

Unforunate that we have so far been utterly unable to get gst debug output and dotfiles from this specific combo of gstreamer + webkitgtk + epiphany + flatpak.

I will await further instructions, I will need an exact foolproof command line for it.

Attached here is a screenshot of what the corrupt video output looks like; note that I resized the screenshot down to 1500px, because it otherwise weighted a ton due to the 4K screen resolution.

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