use ffmpeg to split file by chapter metadata

split-media-by-chapters.sh

#!/bin/bash

while [ $# -gt 0 ]; do
    extension="${1##*.}"
    ffmpeg -i "$1" 2> tmp.txt

    #     Chapter #0:0: start 0.000000, end 1290.013333
    #       first   _     _     start    _     end

    while read -r first _ _ start _ end; do
        if [[ $first = Chapter ]]; then
            read  # discard line with Metadata:
            read _ _ chapter

            ffmpeg -vsync 2 -i "$1" -ss "${start%?}" -to "$end" -c copy "$chapter."$extension < /dev/null
        fi
    done < tmp.txt

    rm tmp.txt

    shift # https://unix.stackexchange.com/a/174568
done