Why does it separate audio & video?

I have a few divX that I'd like to burn to DVD, however, when I import them into iDVD it separates the audio & video (Project info - assets), thus making the actual video seemingly twice as long, so I can only burn have as much to a DVD ... why is that?
I understand iDVD doesn't natively support divX, but have the proper codecs to do it ... so just curious if it's still a result of iDVD not quite fully understanding divX? but even still, once I convert to .MOV it still separates ...
so confused ... and frustrated ....

yeah, I'm guessing that it's the compression that will change things ... whenever I put a divX file in, it said it was taking up twice as much space as the file originally was, so I guessed that meant audio & video ... but that could just be coincidental ...
In all my stupidness I was judging based on file size, not run time. I'm trying to throw a few rugby games onto DVD, each being 1hr20min. Roughly 1gb/game ... on a 4.7Gb DVD i figured I could comfortably get 3 games .... I just realized my folly just before checking back here for answers ... doh!!
dumb dumb dumb.
oh well, live and learn ... again.
As an aside ... why is it that on my package of DVDs it makes reference to different modes (Standard, Long Play, Extend Play, etc.) and how many hours can fit on the disc ... those are usually VHS modes, aren't they? so I'm assuming (I should stop that) that I can't use this info for my divX file, cause if I could fit 6 hrs onto a disc (which the package says I could if I used Extended Play), then I should be able to fit the rugby games on ... but alas I can't, so I'm assuming this doesn't apply to me ...
sigh ... sometimes I wish the guys at my local electronics dealer would be more knowledgeable ... but that's not likely to happen anytime soon, especially if they're on commission

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