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             echo "$f uses CCITT"
         fi
     done
+
+### Audiobook commands
+
+    # cd to desired dir, create 'input' dir and put m4b file in it and run command
+    docker run --rm -it \
+      -v "$(pwd)":/data \
+      sandreas/m4b-tool \
+      split "/data/input/The Haunting of Hill House.m4b" \
+      --audio-format mp3 \
+      --audio-bitrate 192k \
+      --output-dir "/data/split"
+      -vv