Batch file conversors from videos to mp3

mkvToMp3.sh

#!/bin/bash
for i in *.mkv
do
ffmpeg -i "$i" -ab 128k -vn "${i%mkv}mp3"
done

mp4ToMp3.sh

#!/bin/bash
for i in *.mp4
do
ffmpeg -i "$i" -ab 128k "${i%mp4}mp3"
done