What's the VOBsub subtitle format?

Question

Where can I find documentation/sample code of the VOBsub subtitles format? The one that's an .idx and a .sub file.

I need to create a program that generates those subtitles. I've been looking on Google but only found how to rip them from DVD.

Thanks

Answer 1

I think your best approach would be to have a look at the sourcecode of some of the open-source media players. Some of them will have the code to interpret an .idx or .sub subtitle file.

This might be a useful starting point:
http://sourceforge.net/projects/guliverkli/

Answer 2

Not the perfect answer but here is what I found:

http://forum.doom9.org/archive/index.php/t-99815.html

Sorry if it doesn't lead you anywhere.