mp3 to aac

mp3Toaac.sh

# install ffmpeg with aac model in mac
# brew tap varenc/ffmpeg
# brew tap-pin varenc/ffmpeg
# brew options ffmpeg
# brew install ffmpeg --with-fdk-aac --HEAD
# Useage: ./mp3Toaac.sh path-mp3-audios-dir/
# will cover all mp3 audios to aac audio.

echo "$1"

doConvert() {
    input=$1
    output=$2
    ffmpeg -i $input -c:a libfdk_aac -b:a 64k -ac 1 $output
}

target_extension="mp3"

for item in "$1"/*
do
   fileName="${item%%.*}"
   extension="${item#*.}"
   if [ $extension = $target_extension ]
   then
    aacFile="$fileName.aac"
    echo "convert [$item] to [$aacFile]"
    doConvert $item $aacFile
   fi 
done