ffmpeg -i `youtube-dl -b -g $YOUTUBE_URL` -f mp3 -ab 160k -ar 44100 -ac 2 $FILENAME.mp3
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<br>example:
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<br>ffmpeg -i `youtube-dl -b -g http://www.youtube.com/watch?v=H0DTm_bWEjs` -f mp3 -ab 160k -ar 44100 -ac 2 Scooter_vs_Status_QUO-Jump_that_rock.mp3