ffmpeg webm to m4a

webm2m4a.sh

#!/bin/zsh
mkdir f a
for i in *.webm
do
  ffmpeg -i "$i" -write_xing 0 -c:a alac "f/${i:r}.m4a"
  afconvert -v -f m4af -d aac@48000 "f/${i:r}.m4a" "a/${i:r}.m4a"
done