As for converting DVD to MP4, there are so many DVD converters on market that can help you fix this. However, it is known to all that almost all commercial DVDs are copy-protected. It can stop piracy or illegal copy while also prevents you from copying your own purchased DVDs for personal use as well.
In consideration of those issues mentioned above, I will highly recommend WonderFox DVD Ripper Pro. It supports to remove any kind of DVD DRM. Turning DVDs into MP4 can be easy with this handy tool. Before further reading the following tutorial on how to convert DVDs to MP4, please download this DVD MP4 converter and get it ready.