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Thunar custom actions can be used to convert media files by adding a simple command like

avconv -i %f %f.mp3

I would like a command to extract aac sound from mp4 and flv files with a Thunar custom action, just extract the aac eventually in a m4a container, without conversion, similar to this solution (which I do not know how to adapt for Thunar custom actions):

for i in *.mp4; do avconv -i "${i}" -map 0:1 -c:a copy "${i%.mp4}.aac"; done

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I have created a more general question about this: Command not working anymore in Thunar custom actions and I have received a good answer. I have edited to extend that answer and cover this question too.

The command mentioned in the question needs to be added to a script which then can be run from Thunar:

#! /bin/sh -e
for i in *.mp4; do avconv -i "${i}" -map 0:1 -c:a copy "${i%.mp4}.m4a"; done

A simpler command also works:

avconv -i %f -map 0:1 -c:a copy %f.m4a

which is just a modification of

avconv -i %f %f.mp3

Update: improved command

ffmpeg can be used instead of avconv

And add this to Thunar custom actions;

bash -c 'ffmpeg -i "$0" -map 0:1 -c:a copy "${0%%.*}".m4a' %f

setting *.flv;*.mp4 for appearance conditions.

(for webm video replace with ogg, use mediainfo to get info on the audio stream of the video).

Source of the above here and here.

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