Splitting an audio file into chunks of a specified length

audioSlicer.sh

#!/bin/bash

# sudo apt install zenity ffmpeg


error() {
    zenity --error --text "Fehler: $1" --title "Fehler" --ellipsize
    exit
}

info() {
    zenity --question --text "$1" --ellipsize
}

OUTDIR=`pwd`

if ! FILENAME=$(zenity --file-selection --title "Audiodatei auswählen" --file-filter "*.wav *.mp3 *.wma *.WMA *.MP3 *.WAV"); then
    error "Keine Datei ausgewählt ..."
fi

FN=$(basename -- "$FILENAME")
EXT="${FN##*.}"
FILE="${FN%.*}"


if ! MINUTES=$(zenity --scale --text "Wieviele Minuten pro Teil?" --step 1 --max-value 30 --min-value 1 --value 5); then
  error "Keine Minuten ausgewählt ..."
fi

SEC=$(((60*MINUTES)-10))


INFO="
<b>Datei:</b> $FILENAME
<b>Länge:</b> $MINUTES Minuten pro Teil
<b>Ziel:</b>  $OUTDIR/${FILE}_000.mp3

Passt so?
"

if ! info "$INFO"; then
    echo "abgebrochen ..."
    exit
fi


ffmpeg -i "$FILENAME" -codec:a libmp3lame -qscale:a 4 "${FILE}.mp3" |
    zenity --progress --title="Please wait (step 1/2)" --text="Converting to MP3 in progress ..." --no-cancel --auto-close --pulsate

# via https://superuser.com/a/525217
ffmpeg -i "${FILE}.mp3" -f segment -segment_time $SEC -c copy "${FILE}_%03d.mp3" |
    zenity --progress --title="Please wait (step 2/2)" --text="Cutting in progress ..." --no-cancel --auto-close --pulsate

echo "DONE! cut ${FILE}.mp3"
echo "into $SEC seconds long pieces"

# rm "${FILE}.mp3"