[Bug 98005] VCE dual instance encoding inconsistent since st/va: enable dual instances encode by sync surface

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98005

--- Comment #17 from Andy Furniss <adf.lists at gmail.com> ---
(In reply to Andy Furniss from comment #14)
> Hi,
> 
> Initial testing seems good for vbr bitrates

More testing with longer transcoding type tests shows it is still possible to
get low bitrates with the patches.

Input is derived from blu-ray = 13 minutes = 2.6 gig so a bit hard to upload.

Diference seen between gpu on perf and auto (uvd decode is faster with full
clocks)

gst-launch-1.0 -f filesrc location=in-24fps.mp4 ! qtdemux ! queue ! vaapidecode
! queue ! vaapih264enc rate-control=vbr bitrate=10000 !
video/x-h264,profile=baseline ! filesink location=out24.264

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