How to reduce the size of my video

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I am new to screen capture software and only recently began using it. So far I have tried Debut and Cam Studio and several others. All of them produced poor quality for me. I finally found Krut. It is extremely simple to install and use. And the quality of video is SUPERB!

My only problem is the size of the file it creates. I produced a 20 minute test video last night that resulted in a 750mb file. Because the file is so large, I cannot get it uploaded to Kaltura, my online video player host.

Does anyone know how to reduce the size of my video files without compromising quality?

Thanks,

Rob Caldwell