Best Way to Remove Duplicate Movies

I'm a professor and use Keynote for my lectures. I noticed that my lecture files are HUGE (my summary lecture was over 650mb). When I looked at the package I found several duplicates of movies and images that I use in my slides. Is there any efficient and risk free way to delete the extras? Is the a way of putting them in without making duplicates in the first place? I often duplicate slides and move things around each term to improve my class.

Really easy:
Find all the movies in your iPhoto Library. Then Export them to a Folder. Then delete them from iPhoto.
What makes this easy is that every movie is automatically keyworded when you import it.
So to find all the Movies:
File -> New Smart Album
Keyword -> is -> Movie
Now that you've found them. Select All and
File -> Export *_Kind: Original_* (Note: setting the Kind: to Original is vital)
And export them.
Then trash them from iPhoto.
Regards
TD

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