Help me please, I need to know why imovie videos use so much memory

There have been a lot of firsts for me this year. First time owning a laptop, first time owning a mac, and first time uploading videos to youtube. I got my macbook in april and it's my pride and joy. However, I'm having a huge problem with it.
I don't understand why the videos I make on imovie use up so much memory!! Now that I have an hd video camera it's even worse. First of all, I can't import my videos because there isn't enough space. Second of all, the videos I did manage to import were about 30-40 minutes total and are using up about 22GB! I thought my events, (which usually range from 20-50 minutes) were bad enough as they can be 1-2GB
Here is my question:
Why do the videos take up so much space and can I change that?
any information would be very appreciated, I've spent hours scouring the web looking for answers and could not find anything. Thanks again!

sofia castello-branco wrote:
Why do the videos take up so much space and can I change that?
They contain lots of data. You can reduce the resolution, frame rate, or length on movies to reduce their final size, but that won't help you much at import or while you are working with them.

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