# ffmpegwasm/ffmpeg.wasm

FFmpeg for browser, powered by WebAssembly

Repository: https://github.com/ffmpegwasm/ffmpeg.wasm
Canonical: https://ross.abutalabs.com/products/ffmpegwasm
Homepage: https://ffmpegwasm.netlify.app
Language: C
License: MIT
License Family: permissive
Topics: ffmpeg, wasm, experimental-features, video, audio, transcode
Last push: 2026-02-01T08:35:30+00:00

## Health v2 (maintenance only)
Score: 63/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 65, release rhythm 40, longevity 100
- inputs: {"age_days": 2513, "days_push": 213, "days_rel": 603, "gap_med": 0, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 17761, forks 1101 (observed 2026-08-28T04:11:20.341351+00:00)

## What it is
A WebAssembly/JavaScript port of FFmpeg that runs video and audio recording, conversion, and streaming entirely in the browser. It transpiles FFmpeg C code with Emscripten and includes codecs like x264, x265, VP8/VP9, MP3, and Opus.

## Use cases
- convert video files in the browser without a server
- transcode audio to mp3 client-side
- trim or edit video clips in a web app
- extract audio from video in JavaScript
- compress videos before upload in the browser
- add subtitles to video client-side

## When to choose
- you need FFmpeg capabilities without a backend or uploading user media
- privacy matters and files must never leave the client
- you want a pure client-side transcoder in a web app

## When to avoid
- you need maximum transcoding speed or very large files - native FFmpeg is far faster
- you need codecs not compiled into the wasm build
- your app must run in non-WASM environments

## Facets
- artifact type: library
- maturity: active
- function: video-processing, audio-processing, wasm
- domain: media, web-development
- platform: browser, wasm
- tags: ffmpeg, transcoding, client-side, typescript, nodejs

## Member repositories
- ffmpegwasm/ffmpeg.wasm (main) score 63

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:20.341351+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 2026-08-29T17:02:28.248175+00:00, confidence not recorded.
  - readme: https://github.com/ffmpegwasm/ffmpeg.wasm (fetched 2026-08-28T04:11:20.341351+00:00, sha 66768a187656)
  - homepage: https://ffmpegwasm.netlify.app (fetched 2026-08-29T08:00:33.107833+00:00, sha 87966c6fe62d)
- Data as of 2026-08-30T08:39:29.467469+00:00.