Why ibooks is so large (7 Go) while there in no documents?

THe size of iBooks is 7 Go while there is no document. pdf and epub has been deleted.
how can i reduce the size of this app?

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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Trevor Seward
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This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

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Why ibooks is so large (7 Go) while there in no documents?

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