Can you not do it through software like windows media player or VLC? I haven't got a DVD drive on my laptop (I have a USB one somewhere) so can't test it, but am pretty sure you can.
Not sure how well it works, or if it does bad compression but if you have VLC then you should be able to do this:
How To Rip DVDs with VLC - How-To Geek
don't think it'll drop the file size down for phones etc. But worth a try, can always run it through another piece of compression software, should be a few free ones out there, but it's been 4 or 5 years since I've made videos for delivery to devices or slow connections.