[vlc-devel] DXVA : workaround for a bug in ATI drivers

nobody mobody09 at gmail.com
Tue Dec 29 23:46:36 CET 2009

Mathieu Velten wrote:
> hello !
> I am a hacker on the directshow player MPC-HC. I just see that you add
> hardware acceleration (great work !).
> I read the code and it seems that you are not aware of a DXVA
> implementation bug in ATI driver :
> the ATI driver needs the scaling matrix in raster order (vs zigzag
> order in the standard).
> You should change the fill_scaling_lists function accordingly in the
> ffmpeg dxva2 patch using the "workaround" field of the context I
> guess.
> this bug should only trigger with files using custom matrices since a
> flat matrix is the same with both orders.
Are you able to trigger this bug ? What does it do segfault?
Do you have a backtrace?
Can you provide a patch to show your bug findings?
Thank you.


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