Convert iTunes Music folder into a simple directory, preserving structure, and converting the ALAC files into MP3 (leaving the rest untouched). Requires: ffmpeg with LAME, mediainfo

convert_itm.sh

#!/usr/bin/env bash

IN="/media/Music/iTunes Media/Music/"
OUT="/home/akasaka/Music/From_iTunes"

FILES=$(find "$IN/" -type f ! -name '.DS_Store')
IFS=$'\n'
mkdir -p "$OUT"
cd "$OUT"
for file in $FILES
do
	localname=$(dirname "$file" | sed -e "s?$IN/??")
	if [ ! -d "./$localname" ]
	then
		echo "NEW DIR: $localname"
		mkdir -p "$localname"
	fi
	
	fname=$(basename "$file")
	# Ignore zip files!
	if echo "$fname" | grep "zip$\|m4v$">/dev/null
	then
		echo "SKIP: $fname"
	else
		no_need_convert=1
		
		if echo "$fname" | grep "wav$">/dev/null
		then
			# Always convert WAV
			no_need_convert=0
		fi
		
		if echo "$fname" | grep "m4a$">/dev/null
		then
			# M4A can be lossless or lossy, determine which one it is
			mediainfo "$file" | grep ALAC>/dev/null
			no_need_convert=$?
		fi
		
		if ((no_need_convert))
		then
			# File is not lossless, copy direct
			echo "COPY: $fname"
			cp "$file" "$OUT/$localname/$fname"
		else
			echo -n "CONVERT: $fname ... "
			outname="$OUT/$localname/${fname%.*}.mp3"
			srcsz=$(stat --printf="%s" "$file")
			echo -n "$srcsz"
			ffmpeg -loglevel quiet -hide_banner -i "$file" -codec:a libmp3lame -qscale:a 0 "$outname"
			dstsz=$(stat --printf="%s" "$outname")
			echo " -> $dstsz"
		fi
	fi
done