How do I convert VOB to MP4?

From http://www.full-video-converter.com/news/2010/07/how-do-i-convert-vob-to-mp4/
Introduction.
VOB is a container format for audio, video, subtitles, and menus. The most usual sources of VOB files are DVD Video discs. VOB files can exist as usual files, and some software video players are able to play them in such form, although not perfectly. If you simply burn a VOB file to DVD, your hardware DVD player won’t play it. A proper DVD Video should contain additional structure.
VOB files are usually very big. To decrease their size and also to make them playable with most players, you can consider converting them into MP4 format.
We will discuss how to convert VOB to MP4 using Full Video Converter.
Step 1: Download and install Full  Video Converter.
Download Full  Video Converter to a known location. Run setup and follow on-screen instructions to install the application.
Step 2: Start the program. Open your VOB file.
Launch VOB to MP4 Converter. The main window appears:
Click the highlighted button to get a usual “Open” dialog, or click “File” – “Add Video file”.
Browse to the directory where your VOB files are stored and select one (or a group) of them. Click “Open”.
Step 3: Set output format and folder. Convert your VOB to MP4.
The file(s) will be added to the converting list. You can preview any file from the list using the controls in the left lower corner. Some technical information about added source files is shown on the right.
From the “Output Profiles” dropdown list, select MPEG-4 Video Format (*.mp4) (1). Then choose a folder for saving converted files (2). If you have problem saving files in some particular folder, check your permissions and ownership.
The program allows you to fine tune different video and audio parameters, but if you are not sure about them, just use the defaults.
Finally, click the “Quick Convert!” button on the toolbar (3) to convert VOB stream to a proper MP4 video file.
The trial version of Full Video Converter converts only 5 minutes of video. If you are satisfied with the quality and functionality, you can register online and remove all restrictions with your code.
Full  Video Converter Product Page