No Backend found error despite ffmpeg

[macabdul9]

Versions:

ffmpeg==4.3.2
librosa==0.9.2
audioread==3.0.0

OS:

Gentoo

@sampsyo can you please take a look?

[sampsyo]

Hello! With apologies, this is not enough information for me to reproduce the problem or make any guesses about what may be going wrong. Maybe you could try opening up the library and printing some extra logging messages to make some guesses here?

[keeth]

This is a long shot, but if you are using Google App Engine, the Python 3.10 image is missing ffmpeg, apparently:
https://issuetracker.google.com/issues/265852295