well on all Voodoo cards, you get almost no DVD acceleration. they do some little things, but it pretty much doesn't do anything.
however if you're running on anything faster then a K6-2 400 with 64 megs RAM, and a good Soundcard, you don't need to worry buot hardware acceleration (this is a real life fact, I've tested it on my Voodoo 3). you could probably get DVD running good on the same system setup as above (I use a Vortex 2 soundcard BTW) but with a different videocard (one which actually helps DVD playback).