My_home_scripts/convert/convert_dir_mp4_to_ogg.sh

#!/bin/bash
# m4a2ogg converts all m4a to ogg in a directory.
# Arenlor

temp_file="/tmp/1"
find $1 -type f -name "*.mp4" -print | sort -r > $temp_file

while read line
do
  in="$line"
  out="${in%.mp4}.ogg"
  ffmpeg -i "$in" \
    -acodec libvorbis -aq 4 -vn -ac 2 \
    -map_metadata 0 \
    "$out"
    rm "$line"
done < $temp_file