[Libav-user] Calculate spectrogram from the audio channel

[J Decker]

wouldn't have to be a custom filter, just decompress the media file the
normal way..... could actually probably just use the ffmpeg command line
tool to strip the audio and save it as raw samples, then just read the
audio file directly...


On Fri, May 2, 2014 at 5:48 PM, Ricky Huang <rhuang.work at gmail.com> wrote:

> Hello all,
>
> I am trying to reproduce the Shazam algorithm as outlined in Avery Wang's
> paper "An Industrial-Strength Audio Search Algorithm" (
> http://www.ee.columbia.edu/~dpwe/papers/Wang03-shazam.pdf).  One of the
> step in this is to convert the audio to spectrogram and identify the
> spectrogram peaks.  I am wondering if building a custom audio-filter for
> ffmpeg would be the correct way to go?  If so, does anyone have any
> pointers on converting the audio data to spectrogram for me?  (algorithm to
> use, things to note, etc?)
>
>
> Any help would be appreciated.  Thanks.
>
>
>
>
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