#!/bin/bash
# hpf
# Highpass Filter: Remove 100hz and below band.

mkdir highpass
mkdir mono
for f in *;
do
ffmpeg -i "$f" -c:v copy -ac 1 -af "bandpass=f=100" "highpass/${f%}"; 
ffmpeg -i "$f" -c:v copy -ac 1 "mono/${f%}"; 
done