Screenlapser with scrot and mencoder

screenlapser.sh

#!/usr/bin/env zsh
write_avi() {
    mencoder -ovc x264 -mf w=1400:h=900:fps=20:type=jpg \
             "mf://@screenlapser-$atimeout.txt" \
             -o screenlapse-`date +%Y-%m-%d-%H-%M-%S`.avi
    xargs rm < screenlapser-$atimeout.txt
    rm screenlapser-$atimeout.txt
}

trap 'atimeout=$timeout; write_avi; trap - INT; kill -INT $$' INT

while true; do
    timeout=`date -Ins --date "+1 hour"`

    while [[ $shot < $timeout ]]; do
        shot=`date -Ins`
        scrot -q 30 $shot.jpg
        echo $shot.jpg >> screenlapser-$timeout.txt
        sleep 0.333
    done

    atimeout=$timeout

    write_avi &
done