(In reply to comment #15)
> Ok that sounds like you updated the OpenGL packages, but not VDPAU right?
> 
> Well in this case the reason it doesn't work any more is that OpenGL
> advertises OpenGL/VDPAU interop, but the VDPAU driver actually isn't new
> enough end rejects the export request.
> 
> Try the --hwdec=no option on mpv.

You're right about that. It works perfectly with the --hwdec=no option. In the
Arch repos, we have libvdpau 0.7. From what I can tell, that is the latest
version out there in the wild as well.

In any case, I recompiled libvdpau from git (the current master) and installed
it, but the problem persists.