Someone

#!/bin/bash

ffmpeg -i "$1" -acodec aac -ab 160k -ar 48000 -pass 1 -s 320x240 -vcodec mpeg4 -qscale 2 -flags +aic+mv4+trell -mbd 2 -cmp 2 -subcmp 2 -g 250 "$1".mp4

ffmpeg -i "$1" -acodec aac -ab 160k -ar 48000 -pass 2 -s 320x240 -vcodec mpeg4 -b 320k -flags +aic+mv4+trell -mbd 2 -cmp 2 -subcmp 2 -g 250 -maxrate 2000k -bufsize 2M "$1".pass2.mp4

rm ffmpeg2pass-0.log