[Libva] Strange flickering in first row of pixels when using vaapi

[Xiang, Haihao]

Which chipset are you using ?  Could you post your Xorg.0.log ? 

Thanks
Haihao

> Hi,
> 
> I'v seen this accross several version of libva with intel-driver, and 
> I'm not sure where it comes from, but it's very annoying.
> Currently i'm using the latest staging libva and intel driver.
> 
> First I noticed it in XBMC a while ago, and now i ran into it again, 
> while writing a libva-accelerated encoder.
> 
> It's basicaly the first half of the top row of pixels which is 
> flickering from black/some garbage to the real image.
> When watching a video with XBMC, this just is annoying, but when 
> encoding it leads to a lot of artifacts.
> 
> XBMC uses OpenGL and the vaapi GLX functions to render the image, and my 
> Encoder writes the yuv data(which i checked to be correct) in a mapped 
> VAImage which was derived using vaDeriveImage.
> 
> Does anyone know what might be causing this, and how to fix it?
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