linux convert with ffmpeg

[micheleb62]

hello, do you think it could work well?

---

#!/bin/bash

Batch convert all .mp3 files in the current directory to 432Hz with ffmpeg

Options

suffix="false" # Append the -432Hz suffix or not

oldIFS=$IFS
IFS=$'\n'
set -f # Deal with blanks and special characters in file names of the file command and in for loop

found=($(find . -name "*.mp3")) # Find the files in the current directory

IFS=$oldIFS
set +f
filename=""

for file in "${found[@]}"; do # Iterate the found files

Math:

We want to convert from 441Hz to 432Hz, the difference is 9Hz which are 2,040816327 % of 441Hz.

Parameters:

asetrate contains the desired pitch (frequency) but changes the playback speed

atempo ajusts the resulting playback speed, which should remain the same

aresample keeps the pitch change by correct rate of (re)sampling

mv "$file" "$file.tmp"

if $suffix == "true"; then
filename="${file%.mp3}-432Hz.mp3"
else
filename="$file"
fi

ffmpeg -loglevel 8 -i "$file.tmp" -af asetrate=43200,atempo=1.00,aresample=43200 "$filename"
rm "$file.tmp"
echo "Pitched $filename"
done

[mysteryx93]

something like that could work;

but you won't know the exact source pitch, and the audio conversion quality won't be as good as the converter app