From 57bb58564456d19fbee99dd25e87edd4cbc01e24 Mon Sep 17 00:00:00 2001
From: alf <service@wralto.org>
Date: Thu, 26 Mar 2026 10:52:34 +0000
Subject: [PATCH] =?UTF-8?q?m4b=5Fmp3.sh=20hinzugef=C3=BCgt?=
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---
 m4b_mp3.sh | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 m4b_mp3.sh

diff --git a/m4b_mp3.sh b/m4b_mp3.sh
new file mode 100644
index 0000000..7013644
--- /dev/null
+++ b/m4b_mp3.sh
@@ -0,0 +1,64 @@
+#!/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 - 01 - 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: 1
+#   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" <<<$chapter)
+            track_padded=$(printf "%02d" "$track")   # <-- neu: nullgepaddet
+            base_name="${title} - ${track_padded} - ${chapter}"   # <-- geändert
+            chapter_file="${base_name}.mp3"
+            suffix=1
+            while [[ -e "$chapter_file" ]]; do
+                chapter_file="${base_name}_(${suffix}).mp3"
+                suffix=$((suffix+1))
+            done
+            echo "processing $chapter"
+            </dev/null ffmpeg -loglevel error -stats -i "${full_file_path}" -ss "${start%?}" -to "${end}" -codec:a copy -metadata track="${track}" "${chapter_file}"
+            id3v2 --song "$chapter" "$chapter_file"
+            id3v2 --album "$title" "$chapter_file"
+            id3v2 --track "$track" "$chapter_file"
+            echo "$title - $track_padded - $chapter"
+            track=$((track+1))
+        fi
+    done <tmp.txt
+    rm tmp.txt
+    rm "$full_file_path"
+done;
\ No newline at end of file