Hi there again!
I actually see a chance to have VDPAU support in the free branch. I
looked into the needed header files vdpau.h and vdpau_x11.h and those
individual files are licensed under the MIT license.
So if that is really the only thing that is required to build against
VDPAU we could have a vdpau-headers package in free to build the VDPAU
support.
If I find the time I'll further look into that.
Felix