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 you WonderFox DVD Ripper Pro. It supports to remove any kind of DVD DRM. With the easy and user-friendly interface, unique encode technology, this DVD converter makes the three-step DVD conversion faster than ever. It is worth trying.