Problem: "Could not load file test.mp3. Maybe it is not a supported file format? Error is No audio I/O backend is available.."

❓ Questions

Windows 10 64, Anaconda 3.7 The previous version worked fine for me but I can’t make the latest version run. =(

python.exe -m pip install -U demucs

This seems to pass successfully: “Successfully installed demucs-2.0.0 diffq-0.1.0 julius-0.2.3 lameenc-1.3.1 torch-1.8.1 torchaudio-0.8.1 typing-extensions-3.7.4.3”

python.exe -m demucs.separate -d cpu test.mp3

C:\Users\Vita\Anaconda3\lib\site-packages\torchaudio\extension\extension.py:13: UserWarning: torchaudio C++ extension is not available. warnings.warn(‘torchaudio C++ extension is not available.’) C:\Users\Vita\Anaconda3\lib\site-packages\torchaudio\backend\utils.py:89: UserWarning: No audio backend is available. warnings.warn(‘No audio backend is available.’) Separated tracks will be stored in C:\Users\Vita\music-separation\demucs2021\separated\demucs_quantized Separating track test.mp3 Could not load file test.mp3. Maybe it is not a supported file format? Error is No audio I/O backend is available…

I get the same error message with other files (mp3 or wav) and/or full path too. Any suggestions what’s wrong? Do the warnings matter? (The previous version of demucs does not display any.)

[adefossez]

Doing pip install soundfile should fix the issue 😃

[vitacon]

I changed it mostly to reduce the number of dependencies,

I see.

Sorry for the disturbance! It is really hard to support properly all OSes.

I totally understand that.

As a temporary fix, you should still be able to save as mp3s files with the --mp3 flag.

It’s a nice paradox but it really worked! =)

Doing pip install soundfile should fix the issue 😃

And it really does! The installation even did not take 2 hour 😉 and saving to .wav works now.

Thanks a lot! =)