Imported video files are 7-8 times larger than the original!!!

I really like iMovie but the thing is iMovie imports my video files (taken in my AVCHD Sony Handycam HDR-CX11E) with an approximatly 7 times larger file size than the original file size of the movie. And still I have chosen the option "Large - 960 x 540". I really don't know if there is any solution to this "problem". I would be thankful for anyone who could give me a solution.
Regards

The best way to find out is to try it. Take a small but representative sample, do some edits, export as H264, then reimport, do some edits, export again.
I expect some degradation, but here mostly the problem may be the quality (or lack thereof) of the analog originals.
Also, let me clarify: QT movie per se means nothing in terms of quality or compression. The QT is a container format. Inside it can be a high quality, high bitrate ProRes 4444 or a highly compressed H264, or a number of other things.
In FCP X, when you export a Master File, you get to decide in the settings which codec to use (e.g. Prores vs H264), but the output file will still be a QT file.

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Since QuickTime X doesn't have any export "options" (other than dimensions) a "raw" DV Stream format should always be smaller in file size.
DV Stream is about 13 GB's per hour of recording. A QuickTime X "conversion" would use H.264 video and AAC audio codecs and should be about ten times smaller in file size.
Are you sure your files are DV Stream?
In any event, QuickTime X may not be the best tool for the job.
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Why would an alias file be larger than the original file?

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> fill up my Windows media screen
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Adobe product and version number
Operating system and version number
The full text of any error message(s)
What you were doing when the problem occurred
Screenshots of the problem
Computer hardware, such as CPU; GPU; amount of RAM; etc.

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Chris H 71 wrote:
This was originally in Keynote 09.
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Imported video files are 7-8 times larger than the original!!!

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