split_by_chapters.sh


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#!/bin/sh -efu
input="$1"
ffprobe \
    -print_format csv \
    -show_chapters \
    "$input" |
cut -d ',' -f '5,7,8' |
while IFS=, read start end chapter
do
    ffmpeg \
        -nostdin \
        -ss "$start" -to "$end" \
        -i "$input" \
        -c copy \
        -map 0 \
        -map_chapters -1 \
        "${input%.*}-$chapter.${input##*.}"
done