If you wanna export the audio from the .MP4 video file then use ffmpeg,
you can do this all the time from FLV files. Firstly install ffmpeg,
with command bellow:
sudo apt-get install ffmpeg libavcodec-unstripped-*
and then use this command here:
ffmpeg -i video.mp4 -f mp3 -ab 192000 -vn music.mp3
It might say that your missing some codecs for MP4, in that case just run below,
find it and install.
aptitude search codecname
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