[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 #15 from Philippe Normand <philn at igalia.com> ---
(In reply to Jeff Fortin from comment #11)
> Using unrud's VideoDownloader (see
> https://flathub.org/apps/details/com.github.unrud.VideoDownloader ...) to
> download the 4K VP9 version of any 4K sample on youtube
> (https://www.youtube.com/watch?v=OfNJro9jGdE is the one I tested now, but
> probably any other would yield the same result), giving it a simpler
> filename and playing it like so:
> 
> GST_PLUGIN_FEATURE_RANK=vah264dec:MAX,vah265dec:MAX,vampeg2dec:MAX,vavp8dec:
> MAX,vavp9dec:MAX gst-play-1.0 --videosink glimagesink 4k_hdr_sample.webm
> 
> or, more succintly:
> 
> GST_PLUGIN_FEATURE_RANK=vavp9dec:MAX gst-play-1.0 --videosink glimagesink
> 4k_hdr_sample.webm
> 
> ...results in 100% smooth video playback on this Intel Kabylake laptop with
> 4K screen, where intel_gpu_top shows the video decoder is correctly used.
> 

Here on my "recent according to you :)" laptop with no 4K monitor, the sink drops frames like there is no tomorrow.

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