#!/usr/bin/env bash
set -euo pipefail

for file in ./*.$1; do
   map=''
   if [[ $# > 1 && "$2" == 'map' ]]; then
   	  map='-map 0:0'
   fi
   echo "ffmpeg -i '$file' -c:a libfdk_aac -profile:a aac_he -b:a 64k -movflags +faststart $map '../m4a/${file%$1}m4a'"
   ffmpeg -i "$file" -c:a libfdk_aac -profile:a aac_he -b:a 64k -movflags +faststart $map "../m4a/${file%$1}m4a"
done