You got what you asked for - an uncompressed file. You have some serious reading up to do on the basics.
i know i do....
but seems strange to me that it increases the file size from what it was before, but i accept your point. i am *of course* a novice at the moment.
33GB seems excessive for a 2 minute video, my hard disc wont last long at that rate.
thanks for your help
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It doesn't "increase" the file size. You're making a brand new file.
What you put into After Effects has nothing to do with the resulting file. You can have an AE composition with no footage whatsoever and the resulting file will be much larger than 0!
After Effects works internally with completely uncompressed pixel data, so no matter what you toss into it, it produces whatever you tell it to produce. As Mylenium points out, you made an uncompressed final file.
Your original video file is VERY compressed. So, of COURSE uncompressed video is going to look massive by comparison.
Read Mylenium's link to understand a bit more and go here to learn AE: Getting started with After Effects There are lots of "gotchas" like this that'll bit your butt if you skip this basic training stuff.