antimatter15/whammy
A real time javascript webm encoder based on a canvas hack observed · 2026-08-28
Health v2 · maintenance only
32/100
- Activity 0
- Release rhythm 35
- Longevity 100
Flags: no_releases
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 5191
- days_rel: n/a
- days_push: 780
- n_releases_24m: 0
Adoption not part of the score
1032 stars · 178 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
Whammy is a small JavaScript library that encodes canvas frames into WebM video files entirely in the browser by reusing WebP-encoded VP8 image data. It works only in browsers with WebP encoding support (essentially Chrome) and produces intraframe-only video without interframe compression.
Use cases
- record canvas animations to a webm video in the browser
- convert webp image sequences into a webm video client-side
- capture real-time canvas drawings as downloadable video
- encode frames to video without a server
- avoid storing frames as data urls or slow gif encoding
When to choose
- you need fast, fully client-side video encoding from canvas content
- your target is Chrome and WebM output is acceptable
- file size matters less than encoding speed
When to avoid
- you need interframe compression or small file sizes
- you must support browsers without WebP encoding like Firefox or Safari
- you need production-grade video encoding with audio
Facets
library · maturity maintenance
video-processing image-processing media web-development browser-extensions browser webm vp8 canvas client-side-encoding webp
2 sources
- readme: https://github.com/antimatter15/whammy · fetched 2026-08-28 · 37d24c546c56
- registry_npm: https://registry.npmjs.org/whammy · fetched 2026-08-29 · 3302e69059d3
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| antimatter15/whammy | main | 32 |
For agents
markdown · JSON · MCP: product_card(name="antimatter15/whammy")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem