Split an m4b into its chapters. No recoding is done, just splitting

m4b_split.sh

#!/bin/bash
# Description: Split an m4b into its chapters. No recoding is done, just splitting
# Usage: m4b_split.sh $input_file $output_dir/
# Requires: ffmpeg, jq
# Author: Hasan Arous, Nima Taheri
# License: MIT

in="$1"
out="$2"
splits=""

ffprobe -i "$in" -print_format json -show_chapters > chapters.json

printf "\n\n\n\n"
jq -r '.chapters[] | .start_time + " " + .end_time + " " + (.tags.title | gsub("[/\\|?*<>:\" ]+"; "_"))' chapters.json
printf "\n\nEdit chapters \"$(pwd)/chapters.json\" if you like before proceeding.. [press Enter to continue]\n\n\n\n"
read

while read start end title; do
  splits="$splits -c copy -map_chapters -1 -ss $start -to $end $out/$title.m4b"
done <<<$(cat chapters.json \
  | jq -r '.chapters[] | .start_time + " " + .end_time + " " + (.tags.title | gsub("[/\\|?*<>:\" ]+"; "_"))')

ffmpeg -i "$in" $splits