How do I crop a video without changing the format?

I have a video that doesnt fit on a disk and I want to split it in half to fit onto two disks instead. Windows Movie Maker does this but it changes the format to .wmm and i have the video in mpeg-1 format so that i can play them on my dvd player. Is there any free software that will either take bits out of the video or just split it without changing the format. Also, is there any ways I can compress the video without loosing much quality and without changing the format (the video is just over 1gb and my disks are 700mb) , again preferably free. Any help is appreciated! Many thanks!How do I crop a video without changing the format?
chopperxp

is a free programme i used years ago

works fine

try searching for shrink mpeg1How do I crop a video without changing the format?
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