Demucs
App in the BluixApps catalog
What it is
Demucs is the state-of-the-art music source separation tool by Meta AI (FAIR) — splits songs into separate stems: vocals, drums, bass, and other instruments. Used by music producers, video creators, karaoke makers, podcast cleaners.
The "isolate the vocals" / "remove vocals for karaoke" tool, open-source and self-hostable.
What it's for
- Stem separation — extract vocals, drums, bass, other from any song
- Karaoke creation — remove vocals from licensed tracks
- Vocal isolation — acapella extraction for remix/study
- Podcast cleanup — separate background music from speech
- Sample mining — extract individual instruments
- Educational use — teach instrument identification
Who it's for
- Music producers (acapella extraction, remix workflows)
- DJs preparing mashups
- Video editors cleaning audio
- Karaoke service builders processing tracks
- Music educators demonstrating instrument parts
- Podcasters separating background music from speech
Why teams pick Demucs over alternatives
- Hybrid license — code MIT, weights research-only (commercial weights via separate license)
- State-of-art quality in open stem separation
- Hybrid Transformer model — superior to LSTM-based predecessors
- Multiple model variants — quality vs speed tradeoffs
- Active research — Meta AI's continuous improvements
- Fast — 10-20× real-time on RTX 4090
Integrations
- Gradio web UI (BluixApps custom)
- CLI mode for batch
- Pair with: MusicGen (Demucs-extract → MusicGen-generate replacement stems)
- Pair with: WhisperX (vocal extract → transcribe lyrics)
- Output: 4 stem WAV files
Notable users & community
- 9k+ GitHub stars
- Meta AI (FAIR) research backing
- Used in commercial music tools (Karaoke services)
- Featured in audio engineering workflows
- Active research community
Tips & operations
- Model variants:
- htdemucs: best general quality (default)
- htdemucs_ft: fine-tuned, slightly better vocals
- htdemucs_6s: 6-stem (also guitar + piano separately)
- mdx_extra: alternative, different artifacts
- Two-stems mode: just vocals vs instrumental (karaoke)
- Speed:
- CPU: 3-5 min per 3-min song
- GPU: 10-20 sec per 3-min song
- VRAM: 6 GB GPU optimal
- License: code MIT, weights research-only.
- Commercial use: either retrain on royalty-free data
- Or use community alternatives (Spleeter for free commercial)
- Or commercial APIs (LALAL.AI, Moises)
- Production batch: CLI for entire albums
What we ship in BluixApps
- Docker (pytorch CUDA 12.4 + demucs pip-installed)
- Custom Gradio UI with model + two-stems selectors
- Persistent volumes: models cache, input, output (4 stems WAV)
- Port 7879 mapped
- Install report at
/root/bluixapps/demucs.txt - Model variant guidance
- Use case examples (karaoke, sample mining, podcast cleanup)
- License caveat documented (commercial restrictions on Meta-provided weights)
- Pairing suggestions (MusicGen for replacement stems)
- GPU pre-flight check via
bluixapps_ensure_nvidia_runtime - Backup hook covers models + outputs
Get this app — pick a BluixApps plan
Same catalog. Scaling tenant isolation, white-label and support tier.
| Tier | Tenants | Catalog | Support | White-label | Monthly | |
|---|---|---|---|---|---|---|
| Stacks | 1 | 19 curated stacks | Standard | — | $19/mo | DetailDeploy |
| Starter | 10 | Full catalog | Standard | +$15–25/mo | $49/mo | DetailDeploy |
| Pro | 25 | Full catalog | Priority bugfix | +$15–25/mo | $149/mo | DetailDeploy |
| Growth | 100 | Full catalog | Priority bugfix | +$15–25/mo | $349/mo | DetailDeploy |
| Scale | 500 | Full catalog | 7-day window | +$15–25/mo | $799/mo | DetailDeploy |
| Enterprise | Unlimited | Full catalog | Priority 7-day | Bundled | $1,499/mo | DetailDeploy |
