#!/usr/bin/env bash
set -efu

input="$1"; shift
ffprobe -print_format csv -show_chapters "$input" |
cut -d ',' -f '5,7,8' |
while IFS=, read -r start end chapter; do
  ffmpeg \
    -nostdin \
    -ss "$start" -to "$end" \
    -i "$input" \
    -c copy \
    -map 0 \
    -map_chapters -1 \
    "$@" \
    "$(printf %s "${input%.*}.$chapter.${input##*.}" | tr / _ | sed -e "s/\.\./_/g")"
done