Demucs (maintained v4 line)
Source: https://github.com/adefossez/demucs
GitHub marks adefossez/demucs as a fork of facebookresearch/demucs (archived, MIT); the fork's README declares itself the officially maintained Demucs.
Structured fields
{
"archived": false,
"checked_at": "2026-10-17T00:00:00.000Z",
"parent_url": "https://github.com/facebookresearch/demucs",
"usefulness": "Hybrid spectrogram/waveform music source separation (vocals, drums, bass, other); now maintained in the author's repository after the Meta repo was archived. Essential for isolating dialogue from music or making stems for remixing and ADR cleanup.",
"source_type": "repository",
"availability": "available",
"source_owner": "Alexandre Défossez",
"next_check_at": "2026-10-24T00:00:00.000Z",
"hardware_notes": "3-7 GB GPU memory (per README) or CPU.",
"upstream_updated_at": "2026-08-31T20:20:01.000Z"
}Evidence claims
- [sourced_fact] README: 'This is the officially maintained Demucs' after the author left Meta to join Kyutai; slow replies and no new features expected; Demucs v4.1.0 released with modernized packaging, lighter inference dependencies and pretrained models hosted on Hugging Face. · locator: README, header and changelog source
- [sourced_fact] Original Meta repository README: 'this repository is not maintained anymore' and points to the fork; GitHub shows it archived; MIT license. · locator: README, Important notice; repository metadata source
- [upstream_claim] README GPU notes: at least 3 GB GPU RAM for demucs, about 7 GB with default arguments; --segment reduces memory; CPU processing roughly 1.5x track duration. · locator: README, memory requirements source
- [sourced_fact] README License: MIT license (LICENSE file). · locator: README, License source
- [upstream_claim] Research review verdict at export: reviewed (as of 2026-10-17). Recorded by the research pipeline, not a hub review outcome; evidence.review stays unreviewed until an independent reviewer records one.
Rights
| component | license | hosting | redistribution | modification | training | Evidence and notes |
|---|---|---|---|---|---|---|
| code | MIT | permitted | permitted | permitted | unknown | MIT per README for both repositories. |
| model_weights | unknown | unknown | unknown | unknown | unknown | Pretrained model licenses (and training data such as MUSDB18-HQ plus extra data) were not read. |