Merge and encode vob files or a DVD on a mac
Download D-Vision 3 http://www.objectifmac.com/dvision.php
DVDx 4 is freeware (only open edition) and is available for Windows and MAC as well for Linux. This tool from labDV is able to encode video-DVDs into several video formats (.mov / .mp4 and .mpeg and so on) with intergrated subtitles if available on DVD.
A lot of filmmakers are not from english spoken countries. That is why they have to subtitle their films with at least english subtitles if they want to submit to international film festivals.
This articel will give you an overview of tools that can be used for encoding a subtitled version of your film.