Convert mp4 to mp3

In this little tutorial I show you how to convert mp4 to mp3.

First method:

1	vlc some-video.mp4 --sout '#transcode{acodec=mp2a, ab=96}:std{access=file, dst= "my_new.mp3", mux=ts}'

Second one:

Your copy of FFmpeg needs to be capable of outputting mp3:

1	ffmpeg -formats \| grep libmp3lame

1	ffmpeg -i 2Invention_Lonely_Star.MP4 -acodec libmp3lame -ab 128k 2Invention.mp3

Or a loop for more than one file:

1	for f in *.mp4; do ffmpeg -i $f -acodec libmp3lame -ab 128k $(echo $f \| sed 's/\.mp4$/\.mp3/'); done

Convert to WAV:

1	mplayer -ao pcm 2Invention_Star.MP4 -ao pcm:file="2Invention_Star.wav"

A little convert loop:

#!/bin/bash
# 
# m4a2wav
# 
for i in *.m4a; do
    mplayer -ao pcm "$i" -ao pcm:file="${i%.m4a}.wav"
done