#! /bin/sh

if [ -z "$2" ]; then
   echo "Usage: $0 output.avi input1.avi [input2.avi...]"
   exit 1
fi

output="$1"
shift

i=1
for input in "$@"; do
   iii="`printf \"%03d\" $i`"
   ffmpeg -i "$input" -qscale:v 1 _tmp_$iii.mpg
   i="`expr $i + 1`"
done &&

cat _tmp_*.mpg >_tmp_all.mpg &&
ffmpeg -i _tmp_all.mpg -qscale:v 2 "$output" &&
exec rm _tmp_*.mpg