split mkv into separate videos by chapter

[MM Trigger]

I have one large mkv file I'm trying to break up into individual files. Currently it contains an h264 track, ac3 track, vobsub track, and chapter markers. I've been looking around for a way to divide it up into individual files by chapter (8 chapters = 8 files). My biggest problem is figuring out how to split everything without ruining the timings.

I used this guide as a framework for generating the final mkv file thus far. I don't see a way to make mplayer recognize specific chapters in a track, so for now I just ran with it and processed the whole track at once. So I do have the individual vob, ac3, idx, and chapter data files, its just breaking them up by chapter that is the issue. Either breaking up the final mkv file or the source files will work i suppose, I just don't know what tool/method to use for what I want to accomplish.