[Libva] Image corruption with overlay on Up board

[Yann Dirson]

I have a decoding app which successfully decodes an h.264 stream on
several platforms,
both with i965 and amdgpu backends. If I add a simple rectangle
overlay on one part of the
stream, while it's working on some i965 platforms, on the UP board we
can see a good number
of horizontal short black line artifacts on the overlay area while
it's displayed, and a very large
quantity of them once the overlay is removed.  The artifacts
progressively with each frame,
as long as no overlay is modified.

Is this a problem others have seen ?  Could it come from a wrong usage
of overlays, which only by
just luck works elsewhere ?

This is using v0.7.1 (0.7.2 changes do not mention any fix of the sort).

-- 
Yann Dirson <yann at blade-group.com>
Blade -- 90 avenue des Ternes, 75017 Paris