can anyone suggest free of charge dvd to mp4 converter

I have a DVD disc for my business that I desire to move to my Android phone, as a result I can display clients. I believe on Android players I should convert the video to an mp4 (unsure totally). I had VLP player to move the DVD to my documents and now want to transfer and transfer to my phone. Is any person knowing dvd mp4 converter? Thanks for your help!