# etro-js/etro

Typescript video-editing library for the browser

Repository: https://github.com/etro-js/etro
Canonical: https://ross.abutalabs.com/products/etro
Homepage: https://etrojs.dev
Language: TypeScript
License: GPL-3.0
License Family: copyleft
Topics: video-editing, javascript, video, audio, blob, video-manipulation, browser, typescript, etro, hacktoberfest, video-processing, javascript-library, typescript-library
Last push: 2026-08-12T06:05:02+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 85, longevity 100
- inputs: {"age_days": 2889, "days_push": 21, "days_rel": 21, "gap_med": 73.5, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1148, forks 97 (observed 2026-08-28T04:03:46.048623+00:00)

## What it is
Etro is a framework-agnostic TypeScript library for programmatically editing videos in the browser. It composites video, audio, image, and text layers, applies hardware-accelerated GLSL filters, and can play, stream via WebRTC, or record the result to a blob.

## Use cases
- edit videos programmatically in the browser
- composite video and audio layers with text overlays
- apply GLSL filters and effects to video
- record a canvas movie to a downloadable video blob
- build a webcam filter app in React
- chroma key a green screen video in the browser
- stream a composed video with WebRTC
- animate layer properties with keyframes

## When to choose
- you need client-side, in-browser video editing without a server
- you want to composite multiple media layers with custom GLSL effects
- you need framework-agnostic code usable with React, Vue, Svelte, or plain JS
- you want to play, stream, or record composed video directly from the browser

## When to avoid
- you need offline (faster-than-realtime) rendering, which is not yet supported
- you need server-side or heavy-duty video encoding pipelines better suited to ffmpeg
- you need a GUI video editor rather than a code API
- GPL-3.0 licensing is incompatible with your project

## Facets
- artifact type: library
- maturity: active
- function: video-processing, audio-processing, image-processing, graphics
- domain: media, web-development, frontend
- platform: browser, cross-platform
- tags: video-editing, glsl, webgl, typescript, canvas, webrtc, keyframes, chroma-key, framework-agnostic, video, nodejs

## Member repositories
- etro-js/etro (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:46.048623+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 2026-08-30T06:33:49.843188+00:00, confidence not recorded.
  - readme: https://github.com/etro-js/etro (fetched 2026-08-28T04:03:46.048623+00:00, sha c5cd515cc8b9)
  - homepage: https://etrojs.dev (fetched 2026-08-29T12:39:21.537845+00:00, sha 7c789e468efc)
  - site_page: https://etrojs.dev/docs/intro (fetched 2026-08-29T12:39:21.540454+00:00, sha 3fa01c19f1f3)
  - site_page: https://etrojs.dev/docs/0.13/intro (fetched 2026-08-29T12:39:21.542139+00:00, sha 7575aa3684b3)
  - site_page: https://etrojs.dev/docs/0.12/intro (fetched 2026-08-29T12:39:21.543828+00:00, sha c67f496716c8)
  - site_page: https://etrojs.dev/docs/category/getting-started (fetched 2026-08-29T12:39:21.545477+00:00, sha ee97ec67aeef)
  - site_page: https://etrojs.dev/docs/reference/movie (fetched 2026-08-29T12:39:21.547232+00:00, sha f426543b525a)
  - site_page: https://etrojs.dev/docs/category/layers (fetched 2026-08-29T12:39:21.549094+00:00, sha 98917ecbbe85)
  - site_page: https://etrojs.dev/docs/category/effects (fetched 2026-08-29T12:39:21.550543+00:00, sha 42ce6efeba8e)
  - site_page: https://etrojs.dev/docs/category/tutorials (fetched 2026-08-29T12:39:21.551971+00:00, sha 5ae1a617a26a)
- Data as of 2026-08-30T08:39:29.467469+00:00.