RuntimeError: Backend "sox_io" is not one of available backends: ['soundfile'].

[vitacon]

🐛 Bug

I am trying to run umx in Windows 10 64 + Anaconda 3.
The installation ("pip install openunmix") seemed to pass without any problem but "umx anyfile.wav" failed:

(base) C:\Users\Vita\audio-separation\open-unmix-2021>umx nakonci.wav
Traceback (most recent call last):
  File "c:\users\vita\anaconda3\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\users\vita\anaconda3\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\Vita\Anaconda3\Scripts\umx.exe\__main__.py", line 9, in <module>
  File "c:\users\vita\anaconda3\lib\site-packages\openunmix\cli.py", line 118, in separate
    torchaudio.set_audio_backend(args.audio_backend)
  File "c:\users\vita\anaconda3\lib\site-packages\torchaudio\backend\utils.py", line 44, in set_audio_backend
    f'Backend "{backend}" is not one of '
RuntimeError: Backend "sox_io" is not one of available backends: ['soundfile'].

The strange thing was that I got the same error message with full path to the file and even with a non-existing file so it seemed umx could not even load the input file.

Then I noticed this:
Note that we support all files that can be read by torchaudio, depending on the set backend (either soundfile (libsndfile) or sox).
Adding "--audio-backend sox_io" resulted in the same error message, but "--audio-backend soundfile" finally made it work.
Maybe the default setting should change...?

[faroit]

@vitacon thanks for opening an issue. It looks like this is a torchaudio issue:

Their documentation states that

• “sox_io” (default on Linux/macOS)
• “soundfile” (default on Windows)

now, in openunmix I set sox_io as the default for all systems and I guess it would be better to just let torchaudio select their default and allow openunmix to override it if necessary....

[vitacon]

I guess it would be better to just let torchaudio select their default

Sounds good. Thanks! =)