[Bug 792773] [gstreamer-vaapi-master][SKL/APL/KBL] it occurs gpu hang when do one case of vp8 decoding

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792773

--- Comment #8 from sreerenj <bsreerenj at gmail.com> ---
(In reply to Víctor Manuel Jáquez Leal from comment #7)
> (In reply to sreerenj from comment #6)
> 
> 
> I have just tested with libva 1.8 with the intel-vaapi-driver, same version,
> and the GPU hang is there.
> 
> > Also, Can you please test only the decode scenario: vaapivp8dec ! fakesink
> 
> Precisely I did that, and there's NO GPU hang.

Strange!I can reproduce this issue in KBL just with decoding :)
How did you check the gpu hang? you have to run dmesg couple of times, first
run might not show the debug message.

> 
> It seems that the hang is when the sufrace is rendered, either as a image
> (for software processing) or as a display's surface (vaapisink).
> 
> > Is it working with other middleware software like libyami?
> 
> In the github issue, it is mentioned that they did it with libyami, without
> a gpu hang, but now I wonder if they did the rendering of the surface.


I tried with yami,but can't even run the decode !

If I disable the non-zero-coefficient skipping then there is no gpu hang. But
it is wrong to hardcode the value. Let me confirm with some vp8 experts.

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