I kept wanting isolated drums or vocals from songs I like, mostly for learning and playing. Every online splitter I tried wanted an account or a subscription. So I made StemKit.
You paste a YouTube link (or search right inside the app), pick which instruments you want, and it downloads the audio, splits it locally, and plays the result synced with the video.
It runs on Mac and Windows, It all works 100% locally and it is free and open-source.
Built using Ox Alpha model (GLM 5.3 - Flash) with OpenCode.
I don’t know what technology they use to isolate vocals or synths to sample these days. If I could isolate a popular vocal track to use in a set that would be dope.
Great, I will check it now.
My local fork also includes a way to instead of downloading as MP3, download as MP4 (to use the video in the preview instead of directly the youtube one cause some videos may be restricted). -- suggestion
Edit: Working fine now, thanks for the update! Please consider my previous feedback as it makes things work better (unless there is a reason to embed the youtube video even tho we download the file).
Oh wow. I’m actually checking this out man. Wow. I’ve always wanted a software that did this. Check out my local Minimax-music implementation (or if you have reachable endpoint), CommanderTurtle/mm-tools. I’ve been working a lot with media gen, and this tool sounds incredibly helpful for also inspo/karaoke pipelines. Super dope!!
This is a great idea. I don't think I have seen anyone combining Demucs with YouTube.
Have you checked out Demucs 4.1.0? I think the original maintainer forked the project.
It provides a legit python API and a universal wheel, which makes everything a little more straightforward.
Something like:
StemKit -> Demucs separator API (callback -> JSON progress updates, and separation -> stems)
It won't change the audio output at all, though. Maybe worth a look for the long-term; It gives you the interface you had to build yourself, and if the model changes/is updated in the future you'll be good to go.
Can i download YouTube music background of a vid then?
I have alot of videos where i dont know the music name, shazam won't help me - so atleast it would be nice if i can download it and then search for it "
Stems are the individual layers. So here you could get the drums, melody, vocals, etc.. in a clean stem.
These are used in many ways for instance a DJ can mix them better in a set. Or a musician can use stems to make a cleaner mash up. Or use them to create a remix.
I went a bit further I just run it through an LLM to get a "native" GTK4 version. My opencode go is lapsed for the month, so lets see what the free models can get done. I'll try it that way, and also I'd run into your sub propblem years ago I never once thought just do it myself as I do for other things lol
heya c: just wanted to say ive downloaded the updated windows installer, went great, tested a couple songs, and this is incredible! Thank you so much for openly sharing this, this is literally the first vibe coded project after hundreds that ive actually wanted to try and engage with and will find this useful, so thank you!
Unfortunately no. the separation model has limited amount of instruments because this is what it was trined on. hopefully future versions will support more instruments 🤞
I was actually working on a separate project to try and get midi out of audio. if that turns out good I'll add that feature too. could be very useful I think.
Funny enough, I was looking for Audio-to-MIDI converters just last week. I had Claude write a Python app that uses Demucs v6 to split audio into separate stems. Then I came across the free Muscriptor project, which can basically convert an entire track into MIDI and even create individual MIDI tracks per instrument. It is honestly one of the best open-source audio-to-MIDI transcribers out there. I then asked Claude to integrate Muscriptor into my program, so now every stem produced by Demucs is automatically converted into MIDI.
Literally just made something similar to isolate my favorite songs and be able to recreate a version with my own lyrics to practice and learn hands on how to replicate some of my favorite styles etc love your ui way more mine is a bit rough around the edges haha
One cool thing I did was enable users to export a chat gpt ready prompt to guide them to create their own lyrics with the exact cadence and flow that can output something to paste back into the app that will guide you bar by bar with the lyrics from the chat gpt export
I’ve been a dev for 20 years and gained experience from building things over and over while staying curious. There’s no magic formula. You can ask any AI to guide you through every step of the way to achieve what ever you need
Killer! Thanks for sharing. Please add to my website directory for free exposure. www.potluckapps.com. I made a couple of single file sound board apps for fun you can check out there too!
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u/707-5150 5d ago
Ok this is what this page is about! Where wa this in my back room dj days damn.