Converts m4a files to Ogg Vorbis using ffmpeg

m4a2ogg

#!/bin/bash
# Author: Simon Legner <Simon.Legner@gmail.com>

convert () {
  in="$1"
  out="${in%.m4a}.ogg"
  ffmpeg -i "$in" \
    -acodec libvorbis -aq 4 -vn -ac 2 \
    -map_metadata 0 \
    "$out"
}

if [[ $# == 0 ]]; then
  echo Converts m4a files to Ogg Vorbis using ffmpeg.
  echo Usage: $0 file1.m4a file2.m4a ... fileN.m4a
  echo ... produces file1.ogg file2.ogg ... fileN.ogg
fi

for i in "$@"; do
  convert "$i"
done