Get a list of frequencies from an mp3 file?

Question

Python

It is necessary to get a list of frequencies from an mp3 file for their subsequent processing.

Answer 1

en.m.wikipedia.org/wiki/%D0%9F%D1%80%D0%B5%D0%BE%D0%B1%D1%80%D0%B0%D0%B7%D0%BE%D0%B2 %D0%B0%D0%BD%D0%B8%D0%B5_%D0%A4%D1%83%D1%80%D1%8C%D0%B5
Google about fast Fourier transform and python.

Answer 2

1) To be honest, it is necessary to parse MPEG-frames and tear out the frequencies from each sample.
It will not be easy, like writing a decoder, and either will not help here, because. they often take out the actual encoding-decoding in the native code for the sake of speed.
Just one very slow pure python decoder was found right away - bitbucket.org/portalfire/pymp3
convert MP3 to WAV (PCM) with something, and then run an FFT over it (python + numpy + scipy), but then there will be no “list of frequencies”, there will be a frequency spectrum of the restored signal, in which there is very little valuable information.

Answer 3

Compress mp3 to wav, which is easy to work with in Python: habrahabr.ru/post/113239/

Answer 4

You can make an FFT of the entire signal, and then select frequencies with more or less significant amplitudes (for example, select 100 frequencies) This can be done using fftw, a python port is available at launchpad.net/pyfftw/