Using recent vdpau lib (compliled form mesa commit 1ce9205f790471214b69c94f2ee07c4eabfa26f0 - "targets/xvmc-nouveau: fix accidental hardcoded include path") i saw strange crash inside vdpau driver for r300g.
http://streams.videolan.org/samples/MPEG2/interlaced/ - burosch1.mpg
I'll attach gdb.txt (unfortunately i need mesa recompile for more useful debug output) and player's output.
Created attachment 60041 [details]
Created attachment 60042 [details]
VDPAU support has been removed and it's not very useful on these GPUs anyway.