1#!/usr/bin/env sh
2
3ffmpeg -i "$argv[1]" \
4  -c:v copy \
5  -c:a aac \
6  -af "pan=stereo|c0=c2+0.30*c0+0.30*c4|c1=c2+0.30*c1+0.30*c5" \
7  "$argv[2]"