title: How can I do FFT analysis of audio file in chrome without need for playback?
body: <p>There isn't single one working example on whole internet of how to perform FFT analysis of a sound file/buffer/audiobuffer in browser without need for playback. Web audio API has been changed too much to be able to use this library <a href="https://github.com/corbanbrook/dsp.js" rel="nofollow noreferrer">https://github.com/corbanbrook/dsp.js</a>  any more for example. All other clues currently don't lead to solution.</p>
  
  <p>EDIT:
  I don't need to manipulate any of the data, just to read frequency spectrum in different moments in time of the audio. Input of solution can be any form of data(wav file, arraybuffer, audiobuffer, anything) but not stream. Expected output ideally would be array (moments in time) of arrays(freqency bin amplitudes).</p>