Below are links to find out what is inside your MOV files... but, as a GUESS, your MOV file is "something like" the DV AVI files I use on Windows, which is about 13Gig per hour of video
When you export to MP4 you are "most likely" using options to create a HIGHLY compressed file, where much of the original information is removed exactly to create small sizes
Read Bill Hunt on a file type as WRAPPER http://forums.adobe.com/thread/440037
What is a CODEC... a Primer http://forums.adobe.com/thread/546811
What CODEC is INSIDE that file? http://forums.adobe.com/thread/440037
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Report back with the codec details of your file, use the programs below... a screen shot works well to SHOW people what you are doing
http://forums.adobe.com/thread/592070?tstart=30
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For PC http://mediainfo.sourceforge.net/en or http://www.headbands.com/gspot/
For Mac http://mediainspector.massanti.com/
Or... are you asking how to do that MOV-to-MP4 conversion... not that you have done so and don't know what you did?
Michaela...dont cry!
