PredominantPitchMelodia requires reinstantiation for sequential audio processing

[daminnock]

Issue Description:

I'm experiencing an issue with the Essentia library in Python. I'm using the PredominantPitchMelodia algorithm, and I noticed that when I create an instance of the algorithm and use it to extract pitch information from an audio signal, it works as expected the first time. However, when I use the same instance of the algorithm again to process another audio signal, the pitch information is empty.

This code is just an example to show the behaviour.

Code Snippet:

import essentia.standard as es

# Create an instance of PredominantPitchMelodia
pitch_extractor = es.PredominantPitchMelodia()

# First extraction works fine
pitch1, _ = pitch_extractor(samples)

# Second extraction returns an empty array
pitch2, _ = pitch_extractor(samples)

print("First Pitch:", pitch1)
# [  0.        0.        0.      ...   0.      372.14197   0.     ]
print("Second Pitch:", pitch2)
# []

Expected Behavior:

I expected the PredominantPitchMelodia instance to print the same result twice:
[ 0. 0. 0. ... 0. 372.14197 0. ]
[ 0. 0. 0. ... 0. 372.14197 0. ]

However, it seems like the second extraction with the same instance results in an empty pitch array and the output is:
[ 0. 0. 0. ... 0. 372.14197 0. ]
[]

Questions:

• Is there something specific I need to do to reinitialize the PredominantPitchMelodia instance before using it again?

Any insights or suggestions would be greatly appreciated. Thank you!

[andresbrocco]

Same issue here!

[dbogdanov]

Thanks for reporting, this should be fixed in the master branch now. PyPI wheels will be updated later. As a workaround for using current Python wheels, you can explicitly call pitch_extractor.reset() after each compute.