DVDSubEdit

you have a subtitle file directly extracted from the DVD and it doesn’t fit the VOB file or you want to modify it, you need an application like DVDSubEdit. DVDSubEdit allows you to make all kind of changes, not only to the subtitles, but also to any other element without having to modify it previously. DVDSubEdit extract all the information from any VOB file to show you the elements included and its configuration settings. Once you have that data, you’ll be able to modify aspects like the background color, timing, format,...