Re: setting VDPAU_TRACE and VDPAU_NVIDIA_DEBUG causes vdpau to fail?
I don't see any crash here; just MythTV deciding not to use VDPAU for some reason.
None of the VDPAU APIs are returning any error. It looks like this is a pure MythTV problem. You should probably ask about this on the MythTV forums/mailing-list/...
Sorry I can't help more.