I'm trying to find abrupt changes in the spectrogram of an audio using the findchangepts function. However, every time I get the error: Expected input number to be finite.

[y, Fs] = audioread('vocals.wav');
findchangepts(y,'MaxNumChanges',10,'Statistic','rms')
[s,f,t,pxx] = spectrogram(y,128,120,128,Fs, 'yaxis');
findchangepts(pow2db(pxx),'MaxNumChanges',50)

Answer 1

[Walter Roberson]

Suppose that somehow one of the output powers in pxx were exactly 0. Then pow2db() would be -inf there, but findchangeptrs() cannot accept infinite inputs.