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July 19, 2024 16:04
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Audibook convert m4b to mp3. This will split into chaptered mp3 files and automatically reconfigure proper ID3v2 tags.
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#!/bin/bash | |
# | |
# sudo apt-get install id3v2 ffmpeg | |
# | |
# USAGE: | |
# cd /book title/ | |
# bash ~/this_script_path.sh | |
# rm *.m4b (you need to manually remove the original in case something goes wrong) | |
# | |
# | |
# EXAMPLE: | |
# | |
# $ ls | |
# The Wheel of Time - Book 11 - Knife of Dreams, Part 1.m4b The Wheel of Time - Book 11 - Knife of Dreams, Part 2.m4b | |
# $ ~/convert_m4b.sh | |
# ..... | |
# | |
# [OUTPUT]: | |
# | |
# File: Knife of Dreams - Chapter 18 - News for the Dragon.mp3 | |
# Metadata: ID3v2.3 | |
# Title: Chapter 18 - News for the Dragon | |
# Artist: Robert Jordan | |
# Album: Knife of Dreams | |
# Track: 23 | |
# Genre: Audiobooks | |
#initial track number | |
track=1 | |
#assumes ( if there are multiple files Part 01/Part 02) that they are in alphabetical order | |
for i in *.m4b; | |
do | |
name=`echo $i | cut -d'.' -f1`; | |
echo $name; | |
ffmpeg -i "$i" -acodec libmp3lame -ar 22050 -ab 64k "$name.mp3" | |
full_file_path="$name.mp3" | |
#split chapters | |
title=$(pwd | sed 's,^\(.*/\)\?\([^/]*\),\2,' | cut -d , -f 1) | |
ffmpeg -i "$full_file_path" 2> tmp.txt | |
while read -r first _ _ start _ end; do | |
if [[ "${first}" = "Chapter" ]] | |
then | |
read # discard line with Metadata: | |
read _ _ chapter | |
chapter=$(sed -re ":r;s/\b[0-9]{1,$((1))}\b/0&/g;tr" <<<$chapter) | |
chapter_file="${title} - ${chapter}.mp3" | |
echo "processing $chapter" | |
</dev/null ffmpeg -loglevel error -stats -i "${full_file_path}" -ss "${start%?}" -to "${end}" -codec:a copy -metadata track="${chapter}" "${chapter_file}" | |
id3v2 --song "$chapter" "$chapter_file" | |
id3v2 --album "$title" "$chapter_file" | |
id3v2 --track "$track" "$chapter_file" | |
echo "$title - $chapter" | |
track=$((track+1)) | |
fi | |
done <tmp.txt | |
rm tmp.txt | |
rm "$full_file_path" | |
done; |
Thanks for this! Only thing it is missing for me personally would be keeping the artist/reader if it is there, but that is a minor tweak I can do manually when needed :)
Works flawlessly!
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Thank you, amazing script!
But it seems due to bug in ffmpeg if m4b file contains mjpeg picture it recognizes it as video stream and output a error.
So in line 36 you can add "-vn" flag to ignore all video streams, the final command will be:
ffmpeg -i "$i" -vn -acodec libmp3lame -ar 22050 -ab 64k "$name.mp3"
and at line 50 you probably want to add $name in the resulting filename otherwise several m4b files with same chapter names, e.g. "Chapter 1, Chapter 2, ... Chapter N" will produce wrong results, so probably it should be:
chapter_file="$name - ${title} - ${chapter}.mp3"