the old spaces in file names thingy in shell scripts

My script breaks if the file names have spaces...

#!/bin/sh
#
BASE="/home/storage/users/craig/Desktop/dw"
IN="in"
OUT="out"
for f in *.flv; do ffmpeg -i $f `basename $f.mp4 .flv`; done
mv *flv $BASE/$IN
mv *mp4 $BASE/$OUT

How can I fix this?

--
Craig White <craig@tobyhouse.com>

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