How can I get the pitch of an audio using Librosa? (NOT 2D array, but 1D)

[Yifang Wang]

Currently, I'm looking for python packages for audio pitch detection (f0 frequency). I then found librosa and tried the piptrack function to track pitch. However, the result is a 2D array (shown as below) instead of a 1D array.

The thing is, I want to get a simple line chart describing the pitch of audio (just like other packages such as crepe, aubio, and parselmouth).

So how can I get a similar result using librosa?

[Brian McFee]

The piptrack function is for doing parabolic interpolation on spectrograms to infer local peaks, but it is not an f0 estimator.  For that, take a look at the yin and pyin functions added in librosa 0.8.