FFmpeg comand bourne shell script

compand

#!/bin/sh

#
# /usr/local/bin/compand
#
# Bourne shell scriptlet that takes all the files with the mp4 suffix in the current working directory and runs
# FFmpeg's "compress and expand"-filter with pre-selected parameters on them with output to a subdirectory named "compand"
# or if there are arguments run the same once per argument.
#

\/bin/mkdir -p compand

if [ "$#" -eq 0 ]; then
        for file in *.mp4 ; do
                \/usr/bin/ffmpeg -i ${file} -n -filter_complex 'compand=attacks=0:points=-80/-900|-45/-15|-27/-9|0/-7|20/-7' -vcodec copy  compand/${file} ;
        done
else
        for input in "$@" ; do
                \/usr/bin/ffmpeg -i ${input} -n -filter_complex 'compand=attacks=0:points=-80/-900|-45/-15|-27/-9|0/-7|20/-7' -vcodec copy  compand/${input}
        done
fi