Stereo files issue?

[Enrico Caprio]

Hi!

I am trying to process some audio files and receive this error. I have no issues when processing mono files, but this folder contains stereo files. 

Any hints on how to select one of the two channels?

Thank you!

enrico

birdvoxdetect: Threshold = 50.0

birdvoxdetect: Output directory = E:\arch\samples

birdvoxdetect: Duration of exported clips = 5.00 seconds.

birdvoxdetect: Processing: E:\process\S4A11836_20200930_164850.wav

Traceback (most recent call last):

  File "E:\python\Scripts\birdvoxdetect-script.py", line 11, in <module>

    load_entry_point('birdvoxdetect==0.4.1', 'console_scripts', 'birdvoxdetect')()

  File "e:\python\lib\site-packages\birdvoxdetect\cli.py", line 260, in main

    logger_level=logger_level,

  File "e:\python\lib\site-packages\birdvoxdetect\cli.py", line 96, in run

    threshold=threshold,

  File "e:\python\lib\site-packages\birdvoxdetect\core.py", line 750, in process_file

    chunk_pcen = compute_pcen(chunk_audio, sr)

  File "e:\python\lib\site-packages\birdvoxdetect\core.py", line 1084, in compute_pcen

    librosa.util.valid_audio(audio, mono=True)

  File "e:\python\lib\site-packages\librosa\util\utils.py", line 164, in valid_audio

    'ndim={:d}, shape={}'.format(y.ndim, y.shape))

librosa.util.exceptions.ParameterError: Invalid shape for monophonic audio: ndim=2, shape=(3712000, 2)

[Vincent Lostanlen]

Hello Enrico and all,

BirdVoxDetect is only meant to work with monophonic (single-channel) audio. I can work towards making the error message more informative but i think that treating multichannel recordings automatically would potentially misleading. (some users might want to convert to mono before analysis, others to treat them independently)

To split a stereo WAV file into left and right channels, sox is your best friend:

sox stereo.wav left.wav remix 1
sox stereo.wav right.wav remix 2

Replace stereo.wav by your stereo input signal.

Then do:

python -m birdvoxdetect left.wav

python -m birdvoxdetect right.wav

I hope this helps!

Sincerely,

Vincent.

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