Convert or extract audio from video in Avidemux.
CONVERT audio from video using the Avidemux 2.6 and save it as a separate file. Audio level can be normalized (or changed), as shown. It is also possible to EXTRACT an audio file without re-encoding by selecting the 'Copy' option (instead of audio format). File extension and bitrate are shown in the "Audio Track Configuraton" menu in the 1st row, named "Track 1". It's the ".AAC" extension, stereo, 64k in the example.