Since it took me so long to figure this out (with a little help from other tutorials which were imo more laborious than my method, at least the ones I saw), I thought I’d share my way for extracting audio from flash (.flv) files. I saved a bunch of Restoration International videos to my computer using Orbit downloader, then used this method to isolate the sound so I could listen to the talks on my mp3 player.
First, open VLC player. I have version 2.0.6 Twoflower
Ctrl+R opens the Convert/Save window. Click Add… to find the .flv file you wish to manipulate.
Click on the drop-down window in the Settings/Profile section and select Audio – MP3, then click start.
You should see a progress bar that looks like this:
When it is finished, you’re good to go!