Taking apart, making changes, putting back together

[capsib]

I need some help. What I want to do is take the full content of a DVD apart, fix some problems with the main feature's soundtrack, and then put the DVD back together with the original menus, chapter stops, bonus features, and audio synchronization unaltered. How would I extract all the necessary parts in order to do this?

As for fixing the soundtrack, if at all possible, I'd like to keep as much of the original AC3 as possible, without recompressing. Recompressing some parts will be unavoidable, but I'd like to do it as little as possible. But if I can't, I'll let this part go.

[aedipuss]

http://www.digital-digest.com/articles/Simplistic_Guide_for_Replacing_DVD_Streams_page1.html