splitting divx file problems

[rotorspeed]

I have used nanodub to try and split a 790 mb divx movie, after processing a few minutes my hard drive runs out of space, when i look at the output file its around 6.5gb large! how is this possible. what am i doing wrong or do i need 50gb of space for the file?
Im trying to split the file in half then convert it to vcd with nero.
i have the same problems with xvid

[zodiac]

in nandub have audio and video direct stream copy

[rotorspeed]

thanks that worked great and split file quickly