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Windows support for Demucs

If you are using Windows, replace python3 by python.exe in all the commands provided hereafter :)

Parts of the code are untested on Windows (in particular, training a new model). If you don't have much experience with Anaconda, python or the shell, here are more detailed instructions. Note that Demucs is not supported on 32bits systems (as Pytorch is not available there).

  • First install Anaconda with Python 3.7 or more recent, which you can find here.
  • Start the Anaconda prompt.
  • Type in the following commands:
cd %HOMEPATH%
git clone -b main --single-branch https://github.com/facebookresearch/demucs ./demucs
cd ./demucs
conda env update -f environment-cpu.yml
conda activate demucs
python.exe -m demucs.separate -d cpu "PATH_TO_AUDIO_FILE_1" ["PATH_TO_AUDIO_FILE_2" ...]

The " around the filename are required if the path contains spaces. The separated files will be under C:\Users\YOUR_USERNAME\demucs\separated\demucs\. The next time you want to use Demucs, start again the Anaconda prompt and simply run

cd %HOMEPATH%
conda activate demucs
cd demucs
python.exe -m demucs.separate -d cpu "PATH_TO_AUDIO_FILE_1" ...

Updating Demucs

In order to update Demucs, simply run the following from the Anaconda Prompt:

cd %HOMEPATH%
cd demucs
git pull
conda env update -f environment-cpu.yml

Potential errors

If you have an error saying that mkl_intel_thread.dll cannot be found, you can try to first run conda install -c defaults intel-openmp -f. Then try again to run the demucs.separate command. If it still doesn't work, you can try to run first set CONDA_DLL_SEARCH_MODIFICATION_ENABLE=1, then again the demucs.separate command and hopefully it will work 🙏. If you get a permission error, please try starting the Anaconda Prompt as administrator.