Why Is Video Output File So Large?

Hi, everyone,
I have a video screen capture demonstrating a piece of software that I work with. The video is 5:30 long at 30 FPS. It is 7.5 MB, encoded in H.264 (I transcoded it to this format myself.)
I want to cut out 1:30 of the video. So I opened iMovie, added this video to a 30 FPS project, cropped the two portions I want from the event (minus the 1:30 I don't want), and placed them together in the project with a fade-to-black transition between them. I exported the video to the same size, using the same H.264 encoder.
Now the file is 75 MB.
Can someone tell me what I have done to increase this file so much? I would love any tips to get this file back down to 7.5 MB.

there are a few other 'knobs' to play with ... :
usually, there's no need for 30fps on a screengrab - who cares when the mouse cursor 'stutters'?
for a public viewing, 15fps would reduce file size by half.
next, for screengrabs, I wouldn't suggest h254 but Animation ...
last, and most important: bitrate. in the many option&sub-options of the Export with Quicktime dialog, you're allowed to set manually the bit-rate. for plain graphical content as a sreen-grab you can experiment with ultra-low settings, <1.000kB/s or even <500kB/s ... even for a 1920x1280 video (iM had changed the res of your grab into that res).
if the grab had a smaller res, you can re-size that on export in the same dialog too.
lowering frame-rate, bit-rate and probably resolution will help you to accomplish the goal.
for the last grain of quality on low bit-rate, I would also suggest the free x264-encoder which imho performs on low rates better than the original h264.-

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