You need a specific machine called the compressor. You stack the DVDs you want on top of each other and then the compressor mashes them all together into one CD.
no there are many softwaresthat can compress the movies just open the win xp and make a folder as zipped folder and then past the movie in it,it will compressed form,just visit the following site and get more detail about compressing the videos and also download the compress softwares.