u/and-amp

u/solsaul recently posted about mvsep.com - which provides extensive stem-splitting. For example, the mega 53(!) stem split contains strings, guitar, piano, saxophone etc. However, this website has a few limitations on the free plan: no lossless, queues, max quota, etc.

A few months ago, the mega 53 stem splitter was made open-source, so I wanted to write a quick tutorial on how you can run this (and other models) locally on your computer for free!

Requirements:

16GB RAM and an NVIDIA GPU (e.g. 3060 or latest) is recommended. Should work without, although may be slow.

This tutorial will be for Windows, although should work with other OS if you know your way around.

Setup (only need to do this once):

1. Install the latest version of Python (currently 3.13), and enable environment variables in the custom section of the installer.
2. Create a new folder, e.g. C:\Music\MySep.
3. Run PowerShell, and run these commands with your path substituted in

cd C:\Music\MySep

py -3.13 -m venv mvsep-env

.\mvsep-env\Scripts\Activate.ps1

python -m pip install --upgrade

pip python -m pip install --no-cache-dir "git+https://github.com/openmirlab/bs-roformer-infer.git@main"

Splitting a track:

To list all currently available models, run this command:bs-roformer-download --list-models

To split an audio file, run this command:

bs-roformer-infer --model roformer-model-bs-roformer-mvsep-mega-53-stems --input_folder "F:\Example\Music\songs\Folder-With-Song-In-It" --store_dir "F:\Example\Music\songs\stems" --device auto

Substitute:

--model with the model you want to use

--input_folder for the location of the song (it will process every file in this folder!)

--store_dir for where the stems are output

And then you have 53 stems from one track!

It did take a while to run on my 3060, but as it takes a whole folder as input you could always run this on an entire library while at work/overnight.

Enjoy!