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I would like to make a music visualizer, but I need to know the intensity of the music playing. The music is playing from my Pi, so if this is possible without a mic that would be great but I'm assuming it's not. Is there a command line tool that returns the audio intensity from the mic at a given time?

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    Take a look at SoX and Marsyas. Also look at this SO post. I'm not sure if any of these could work on the Pi. Perhaps you should also add more details on the software you are using to play the music. – Coert Grobbelaar Dec 7 '15 at 12:40
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    This seems almost exactly like what you need. – Coert Grobbelaar Dec 7 '15 at 12:45

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