[Libva] Running libva applications without X

[Timo Rothenpieler]

> I got vaGetDisplayDRM() to work and the returned display is passed into 
> vaInitialize().  However, I want 4 of the same application running, and 
> vaInitialize() fails on the 2-4 instances.  I had the 4 instances all 
> running well using X11 and vaGetDisplay, so I'm very confident this has 
> something to do with the switch to not using X11.

That's how drm devices work, application take exclusive ownership of the
device. So without something like an XServer as intermediate only
exactly one application at a time can use it.

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