user/split_audiobook.sh

   1 #!/bin/bash
   2 # Desc: Split an audio file by chapter
   3 # Depends: ffmpeg, jq
   4 # Ref/Attrib: [1] Hasan Arous. MIT license. https://unix.stackexchange.com/a/612124
   5 #             [2] John Smith. https://unix.stackexchange.com/a/712600
   6
   7 in="$1";
   8 out="$2";
   9 splits="";
  10 n=0;
  11 while read start end title; do
  12     newTitle="$(echo "$title" | sed "s/ /_/g")";
  13     newTitle="$(printf "%02d..%s" "$n" "$newTitle")";
  14     splits="$splits -c copy -ss $start -to $end $out/$newTitle.m4b";
  15     ((n++));
  16 done <<< $(ffprobe -i "$in" -print_format json -show_chapters \
  17   | jq -r '.chapters[] | .start_time + " " + .end_time + " " + (.tags.title | sub(" "; "_"))');
  18 ffmpeg -i "$in" $splits;
  19
  20 # Author: Steven Baltakatei Sandoval
  21 # License: GPLv3+