Search and convert all mp4 videos to mp3 audio files

mp42mp3.sh

#!/bin/bash

# requires ffmpeg
# apt install ffmpeg

find . -type f -iname "*.mp4" -exec bash -c 'FILE="$1"; ffmpeg -i "${FILE}" -vn -acodec libmp3lame -ac 2 -ab 320k -ar 48000 "${FILE%.mp4}.mp3";' _ '{}' \;