Warning message using Chroma - "Trying to estimate tuning from empty frequency set."

[Good Robot]

Hello,

I am using the command:

chroma_d = librosa.feature.chroma_stft(y=audio, sr=sample_rate)

Can you tell me what could cause the warning message:

\Python\lib\site-packages\librosa\core\pitch.py:146: UserWarning: Trying to estimate tuning from empty frequency set.
         warnings.warn('Trying to estimate tuning from empty frequency set.')

I think this warning message is causing my "alive_bar" to get stuck

My usage is extracting Chroma features using the line above, from labeled data, read from a csv file.

Let me know what other information you may require to help with an answer to this question as it is causing my alive_bar status to get stuck in PyCharm:

with alive_bar(items, force_tty=True) as bar:

Thanks!

[Brian McFee]

This happens when trying to estimate tuning from a signal that lacks prominent spectral peaks.  It is only a warning (not an error), and it cannot cause your progress bar to get stuck.

[Mason Wang]

Hello Professor,

Thank you for this insightful response!

I am getting this issue too. While it does not get stuck it does slow down quite a bit when this happens. What is the reason for this?

Best,

Mason

[Brian McFee]

There's nothing in the code path that leads to this warning that would incur additional computation.  If it's slowing down, that's unrelated, and probably running into jit compilation (or perhaps a heavy lazy import).