Subtittle problem

How can I change font in sub tittle and color when I watch movies on DVD player?Because letters are too small and color is white.Can I do that with any program or I can do that when I insert disc in my dvd player?Help me pleaseeee!!!!
Answer #1
http://www.calcitapp.com/AVIAddXSubs.php
Answer #2
I think there is the option for that in Convertxtodvd, I’ve never used it myself but once you go into FOnt there is Font and Color options.
Answer #3
OK,I will try!