Comment # 11 on bug 79520 from Emil Velikov

FYI if you're using VDPAU, setting LD_LIBRARY_PATH and LIBGL_DRIVERS_PATH will
not work. The libvdpau library is hardcoded to search for
/usr/lib/vdpau/${driver}_vdpau.so.

There are two ways around this - rebuild libvdpau with this commit [1] and set
VDPAU_DRIVER_PATH or symlink/install the library.

[1]
http://cgit.freedesktop.org/~aplattner/libvdpau/commit/?id=ee9491a1216f47e10cbb551391a01c7fcde940d2