(In reply to comment #2)
> A quick look at the log:
> 
>  - VLC always creates/opens multiple vpdau devices (offending flashplayer
> does the same).
>  - VLC does not seem to render/present via VDPAU.
> 
> vdp_decoder_create
> vdp_video_surface_create
> 
> vdp_decoder_render
> vdp_video_surface_get_bits_y_cb_cr
> vdp_decoder_render
> ....
> 
> vdp_video_surface_destroy
> vdp_decoder_destroy

OK, so it's only using vdpau for decoding, not for displaying. Could be that
the get_bits_y_cb_cr thing is messed up (and/or I didn't set enough bits on the
vp2 surfaces to make it not mess up...)