#!/bin/bash

# Generate Spectrographs of the sub-audible range, printer friendly output.

mkdir -p spectrograms

for file in *.*;do
    outfile="${file%.*}.wav"
    ffmpeg -i "$file" "$outfile"
    mv "$outfile" ./spectrograms
done

cd spectrograms

for file in *.wav;do
    outfile="${file%.*}.png"
     sox "$file" -n rate 400 spectrogram -m -l -o "$outfile"
done