chaptersplit 2022.02.26

#!/bin/bash
# Original code from: http://crunchbang.org/forums/viewtopic.php?id=38748#p414992
# m4bronto

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

scriptname="$(realpath $0)"
title="title"
#The Ascent of Money"
#Principles for Dealing with the Changing World Order"
#Capital and Ideology"
stamp=$(date +%s)

function editscript(){
echo "scriptname: $scriptname"
if [[ "$1" == "edit" ]]; then
 (/usr/bin/nano "$scriptname")
 exit
fi
}

function pause(){
   read -p "$*"
}

editscript "$1"

while [ $# -gt 0 ]; do

ffmpeg -i "$1" 2> ".tmp$stamp"

while read -r first _ _ start _ end; do
  if [[ $first = Chapter ]]; then
    read  # discard line with Metadata:
    read _ _ chapter
#    ffmpeg -nostdin -activation_bytes <bytes> -vsync 2 -i "$1" -ss "${start%?}" -to "$end" -vn -b:a 17k -acodec libopus "$title -- $chapter.opus" </dev/null
#    ffmpeg -n -nostdin -hide_banner -stats -vsync 2 -i "$1" -filter_complex "compand=attacks=0:decays=0.12:points=-70/-900|-40/-90|-35/-37|-21/-18|1/-1|20/-1:soft-knee=0.03:gain=1.00:volume=-90, firequalizer=gain_entry='entry(0,-99);entry(140,0);entry(1000,0);entry(8000,1);entry(10500,4);entry(12000,5);entry(14500,-4);entry(19000,-20)', volume=1.0" -ss "${start%?}" -to "$end" -vn -b:a 17k -acodec libopus "$title -- $chapter.opus" </dev/null
###copy:
    ffmpeg -n -nostdin -hide_banner -stats -vsync 2 -ss "${start%?}" -to "$end" -i "$1" -vn -codec copy "$title -- $chapter.opus" </dev/null
###convert:
#ffmpeg -n -nostdin -activation_bytes <bytes> -hide_banner -stats -vsync 2 -filter_complex "compand=attacks=0:decays=0.12:points=-70/-900|-40/-90|-35/-37|-21/-18|1/-1|20/-1:soft-knee=0.03:gain=1.00:volume=-90, firequalizer=gain_entry='entry(0,-99);entry(140,0);entry(1000,0);entry(8000,1);entry(10500,4);entry(12000,5);entry(14500,-4);entry(19000,-20)', volume=1.0" -ss "${start%?}" -to "$end" -i "$1" -vn -b:a 17k -acodec libopus "/dev/shm/cache/$title -- $chapter.opus" </dev/null


  fi
done <".tmp$stamp"

rm ".tmp$stamp"

shift
done

for i in "$title -- Chapter "?.opus;
 do
  mv "$i" "${i/Chapter /Chapter 0}";
 done

if [ -n "$1" ];
 then
  echo mediaduration "${1#*.}" `mediaduration "${1#*.}"`
  echo mediaduration opus `mediaduration opus`
 else
  echo mediaduration "${file#*.}" `mediaduration "${file#*.}"`
  echo mediaduration opus `mediaduration opus`
fi