# charlotte-xiao/NCM2MP3

网易云ncm音乐格式转换为mp3音乐格式工具

Repository: https://github.com/charlotte-xiao/NCM2MP3
Canonical: https://ross.abutalabs.com/products/ncm2mp3
Language: Java
License Family: other
Archived: true
Last push: 2023-07-05T02:22:16+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2047, "days_push": 1156, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1049, forks 191 (observed 2026-08-28T04:03:22.652529+00:00)

## What it is
A Java tool that converts NetEase Cloud Music's proprietary NCM encrypted audio files back into standard MP3/FLAC formats, with both a Swing GUI and command-line interface. It decrypts the NCM container using AES128 and RC4 to recover the original audio data.

## Use cases
- convert ncm files to mp3
- decrypt netease cloud music downloads
- batch convert ncm music library
- recover mp3 from ncm format
- play netease music outside its app

## When to choose
- you have NCM files downloaded from NetEase Cloud Music and want standard MP3/FLAC files
- you prefer a simple GUI or CLI on any platform with Java installed

## When to avoid
- you need conversion of other audio formats or general transcoding
- you want an actively maintained project with a license and ongoing support

## Facets
- artifact type: cli-tool
- maturity: maintenance
- function: cryptography, file-system, cli, gui
- domain: files, media, privacy
- platform: cross-platform, jvm, cli
- tags: ncm-format, netease-cloud-music, audio-conversion, drm-decryption, java, swing, aes, rc4, desktop

## Member repositories
- charlotte-xiao/NCM2MP3 (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:22.652529+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:00:28.448041+00:00, confidence not recorded.
  - readme: https://github.com/charlotte-xiao/NCM2MP3 (fetched 2026-08-28T04:03:22.652529+00:00, sha 516e46c32559)
- Data as of 2026-08-30T08:39:29.467469+00:00.