Why is my iBooks textbook so large?

So we  have been developing iBook textbooks at our offices for for a few months now. It's a great software and our company is really happy with interactivity of the books. However, we are using video now  inside our iBooks and I don't understand why the books are turning out to be such huge files. Unfortunately, we cannot link our books online right now, as we would like to keep the movies contained inside the textbook. But what really confuses me, is this:
- after all of our videos have been converted into .m4v  format, the combined size is about 1 GB
- one block, with several videos, turns out to be 750 MB (in the largest case). This book doesn't even incorporate one third of the videos.
The only thing I can think of, is that our books are developed so that several videos are reappearing in different pages. That is to say, a video that appears in page-one, might also appear on page 3, page 7, and page 10. So perhaps, as opposed to indexing the videos in the back end, and then pointing those files to the appropriate page, I have a feeling that iBooks is copying new instances of the same video file for each page. Can anyone give me any idea if they know this is what's going on? This is the only thing I can imagine that would make our books so large. And, if this is happening, does anyone have a workaround so that if we have the same video on multiple pages, it won't copy multiple video files - instead iBooks will be smart, and grab the one indexed file to be used in multiple pages?
I'm praying someone can give me some insight, because no one at the Apple store or anywhere else has been able to give me any satisfactory information regarding this, and we really need to bring the file size of our iBooks down.
Cheers,

Shimokita Kid wrote:
So it looks like the real answer I need is: how do I reduce file size but keep as close to HD quality as possible.  I know there's no magic formula but I think I'm tired of trial and error / survival. I don't understand how someone can rip a 2 hour DVD quality movie into 700MB but one of our ultra compressed, 5 minute videos we make takes up 90MB, and is nowhere near the quality of a DVD (despite being filmed in a film studio with HD cameras in the beginning).
I have over two hours of video in my book and encode as 640x480. That looks decent on an iPad, and costs about 10 MB per minute. That kept my book size to a (not entirely reasonable) 1.3 GB.
Work on your encoding process. How many minutes of video do you have in total, and how much of that is duplicated by being included more than once?
Also, Michigan, can you post your prior advice again below so that I can give you the "this solved my problem" points?  Thanks to both you and KT for all the help thus far.
I'm assuming that your spell correction gizmo had a shot at "fixing" my name
Don't worry about the points--get your video fixed instead
Michi.

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