flac to aac batch transcoder

flactoaac.sh

#!/bin/bash

set -e


newdir="${PWD##*/}"
mkdir -p "$newdir"

process_file() {
    local i="$1"
    local out="$newdir/${i%.*}.m4a"
    

    ffmpeg -y -vn -i "$i" -c:a aac_at -q:a 3 -ar 48k  "$out" # change your required quality here use fdk_aac or aac if audiotoolbox not supported

    if [[ -f cover.jpg ]]; then
        convert cover.jpg -resize 500x500 -strip -quality 70 compressed.jpg
	AtomicParsley "$out" --artwork compressed.jpg --overWrite >/dev/null
    fi

    echo "Finished: $i"
}
export -f process_file
export newdir


IFS=$'\n'       
find . -maxdepth 1 -name '*.flac' -print0 | parallel -0 -j 4 process_file # change the number threads here
cp cover.jpg "$newdir/cover.jpg"

this needs atomic parsley,ffmpeg and gnu parallel