Burning downloaded anime on to DVD

[Amethyst]

but how do you extract the subs from the video file?what program does that?

Why would you want to extract the subs from the avi video file to begin with? Most fansubs are hard coded into the video file and you can't remove them. I thought the problem was you had a sub file (srt. ssr... whatever) and you needed to get it into the video file in order to convert and write it out to dvdr.