Split mp3

split-mp3.sh

#!/bin/bash

if [ $# -ne 3 ]; then
  printf "Usage: %s LIST INFILE OUTDIR\n" "${0}"
  exit 1
fi

function add_seconds () {
  echo $(( $1 + $2 ))
}

function add_minutes () {
  echo $(( $1 + ($2 * 60) ))
}

function add_hours () {
  echo $(( $1 + ($2 * 3600) ))
}

function parse_list () {
  local line
  local -i seconds
  echo 0
  while read -r line; do
    if [[ "${line}" =~ ^0?([0-9]+):0?([0-9]+):0?([0-9]+)$ ]]; then
      seconds="$(add_hours "${seconds}" "${BASH_REMATCH[1]}" )"
      seconds="$(add_minutes "${seconds}" "${BASH_REMATCH[2]}" )"
      seconds="$(add_seconds "${seconds}" "${BASH_REMATCH[3]}" )"
      echo "${seconds}"
    fi
  done
}

# infile outdir ...timestamps
function split () {
  local infile="${1}" outdir="${2}"
  local -i start_index="${3}" end_index i=1
  shift 3
  while [ $# -ne 0 ]; do
    end_index="${1}"
    ffmpeg -ss "${start_index}" \
      -to "${end_index}" \
      -i "${infile}" \
      -c copy \
      "${outdir}/${i}.mp3"
    start_index="${1}"
    (( i++ ))
    shift
  done
}

declare -a timetamps
mapfile -t timetamps < <(parse_list < "${1}")
split "${2}" "${3}" "${timetamps[@]}"

tracks.list

00:02:51
00:02:42
00:04:14
00:01:12
00:01:56
00:02:09
00:02:48
00:05:17
00:02:39
00:02:55
00:04:21
00:01:56
00:02:41
00:02:26
00:03:41