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I have an .mp4 file with both audio and visual, however I want an .mp4 file with just audio, so how can I just strip off the rest? Is there an application which will allow me to do that? I am running Ubuntu GNOME 15.10 with GNOME 3.18.

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    Why do you want an mp4 that's only audio? why not an mp3, flac, ogg, or anything else? – Hellreaver Nov 23 '15 at 20:59
  • @Hellreaver what is the problem with mp4? Its only a container. And using mp3 or some other format could reencode the content. Using ffmpeg with -acodec copy will just demultiplex audio only. – Dimitri Podborski Feb 4 '16 at 12:53
  • @incBrain it's a video container, which will be opened by default as a video. Not a huge issue, but it seems like it could complicate things. – Hellreaver Feb 5 '16 at 6:27
  • @Hellreaver who says that? This isn't true! Meta information in mp4 says weather its video, audio, subtitles or all together. Why in world should it be opened as video? How do you initialize the video decoder if there is no video in it? And it's not a video container!!! But multimedia. – Dimitri Podborski Feb 5 '16 at 6:44
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You can use ffmpeg. In Ubuntu, you can install it with:

sudo apt-get install ffmpeg

To convert any video simply run:

ffmpeg -i videofile.mp4 -vn -acodec copy audiofile.mp4

An alternative is to use the arguably more syntactically correct extension .m4a:

ffmpeg -i videofile.mp4 -vn -acodec copy audiofile.m4a

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