Or, one other thing you can also do (i've done it myself several times) is to disable subtitles from DVD and load external title like SRT, SUB, TXT,... like when playing divx movie. Just find subtitle with correct fps (to match your DVD movie) and it should do the trick.

Note: play DVD movie as DVD (i know, sounds weird :) ), just wanted to point on diference from previous post. All the best!