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I have a MKV file with 4 MPEG AAC audio streams. I would like to extract one of those streams into a separate audio file, but the “Convert” feature in VLC does not seem to have an option to select the audio stream, and if I proceed, the generated file is not playable.

I’ve tried to google the solution, but I haven’t found any results about multiple audio streams in a single video file.

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The best program for singling out audio tracks - or any others - from an MKV container is the freeware MKVtoolnix. You select/deselect the tracks by checkbox ...

https://mkvtoolnix.download/

I do not know of any official links other than the one above.

I use it on a daily basis and can verify it's ease of use for this type project.

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  • Welcome to Super User! Please read How to recommend software for minimum required information and other suggestions on how to recommend software on Super User. To keep your answer useful even if included link(s) breaks please edit these details into your answer. – I say Reinstate Monica Mar 2 '18 at 17:09
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You can change audio track in VLC Preference menu.

VLC Preference 
   Audio 
      Show All 
          Input Codec 
              Track Setting 
                   Audio Track -1

change -1 to 0 for audio track 1, 1 for audio track 2, save it and do convert as usual.

Don't forget to set -1 again before you quit!

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  • Just as a thought, it might be nice if there was a bit more detail on each section (e.g. Preferences is found under Tools, Audio is a button, Show All is actually the Show settings -> All radio button, Input Codec is Input/Codecs, Track settings is a section and Audio track is a field). Note you can make lists as well (either manually or you can start them from the editing/markdown interface). – Anaksunaman May 10 '18 at 10:14
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I believe you can use Handbrake for this.

Download it for your platform at https://handbrake.fr/.

Once installed, click the "Source" button. Select the MKV file. It will load, and in the menus underneath "output settings" you can select audio. A list will come up with what audio tracks you want to want to extract.

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0

Items needed : mkvtoolnix and inviskamkv extract

Install two software above. Next, open inviska and drag the file(s) into that. Finally, select the tracks you want to be extracted and click start :)

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