The most insane I've seen is 20GB down to around 6GB, and no one to this very day has given me an explanation as to how it was done. More than a simple compression session with Winrar or 7zip was done there.
Although, I only ever asked the people on one forum..
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LOL! Only one place you could possibly get it done is in the Emerald City. Take it to a fella named OZ.
The most insane I've seen is 20GB down to around 6GB, and no one to this very day has given me an explanation as to how it was done. More than a simple compression session with Winrar or 7zip was done there.
Although, I only ever asked the people on one forum..
Compression doesn't work like that, but you could try other methods to shrink your file size.
You can try to change the video type (MP4/avi/wmv).
You could try lowering the resolution.
You could try reducing the frame rate.
You can play with the settings in Movie Maker to get the size you want, but keep in mind, you'll probably sacrifice picture quality.
http://www.wikihow.com/Reduce-Video-Size