How can I convert dvd to iphone and extract audio from it?

[retractors37]

Hey guys, I think I need some advice.I've bought a Riverdance DVD and now I want to convert some parts of the show to my iphone so that I can watch while boring. And also I would like to extract some classic audio clips from it and convert them to mp3 format(or other format that I can play on iphone).Can you tell me the best software you've used to do that?Thanks so much.