convert_m4b.sh

for file in "$1"; do
	string1="/untagged/"
	string2=".m4b"
	string4=".log"
	mpthree=$(find "$file" -maxdepth 2 -type f -name "*.mp3" | head -n 1)
	string3=$string1$file$string2
	string5=$string1$file$string4
	echo Sampling $mpthree
	bit=$(ffprobe -hide_banner -loglevel 0 -of flat -i "$mpthree" -select_streams a -show_entries format=bit_rate -of default=noprint_wrappers=1:nokey=1)
	echo Bitrate = $bit
	echo The folder "$file" will be merged to  "$string3"
	echo Starting Conversion
	docker run -it --rm -u $(id -u):$(id -g) -v /path/to/temp/mp3merge:/mnt -v /path/to/temp/untagged:/untagged m4b-tool merge "$file" -n -q --audio-bitrate="$bit" --skip-cover --use-filenames-as-chapters --audio-codec=libfdk_aac --jobs=4 --output-file="$string3" --logfile="$string5"
	mv /path/to/temp/mp3merge/"$file" /path/to/temp/delete/
	mv /path/to/temp/untagged/"$file".chapters.txt /path/to/temp/untagged/chapters
	echo Finished Converting
	echo Deleting duplicate mp3 audiobook folder
done