Trick source
To compress a big video file, movie.avi and split it into multiple files, each size up to 12MB,
$ rar a -m5 -v12m myarchive.rar movie.avi
if it is a directory:
$ rar a -m5 -v12m myarchive.rar dir/*
A list of files (myarchive.part1.rar, myarchive.part2.rar, ..) will be created in current directory.
You may change the compression quality, -m5 is the best and the slowest, while -m0 do no compression at all (-m3 is default).
Use -v4480m in order to get 4Gb chuncks (to put in a whole DVD each one)
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