The .aep file is just your AE project file. At its more basic, it’s a database that keeps track of your assets, how you use them in a composition and the effects you layer on top of them, it’s generally going to be small. The mp4 is the output. Factors like composition size 1920×1080, frame rate, bit rate and complexity of each frame all contribute to the final size of the mp4.
Johnny Cuevas, Editor
ThinkCK
“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.