If you dont want to have to dl a new app- In the "recording" section of the volume setting select master, play the vid, open up sound recorder (or if you have another app use that) and hit record for the part you want.
Adobe Audition has an extract audio from function. Good overall wav editing app . Also good for removing surface noise from vinyl recordings torrent file
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but maybe there's a tool like mpegstream for .avi ...
For windows obv
torrent file