prisma-omni-watermark-remover

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prisma-omni-watermark-remover

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Prisma Omni Watermark Remover — private, in-browser AI-video watermark remover. Static site, no backend.

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# Prisma Omni Watermark Remover

A private, **in-browser** tool that removes the visible corner watermark from AI videos
(1280×720, 720×1280, 1920×1080, 1080×1920). One flow: **upload → output**. Nothing is
uploaded to a server — all processing happens on the user's device via WebCodecs.

Design: Brainfish neo-brutalist "stickers on paper" — white canvas, lime accent, hard
offset shadows, Satoshi 500/700, pastel bands, wavy dividers.

## Deploying it?

→ **See [DEPLOY.md](DEPLOY.md).** Short version: it's a static site with **no backend and
no build** — upload this folder to any static host over HTTPS. Configs for Vercel, Netlify,
Cloudflare Pages, GitHub Pages, and Docker/nginx are included.

## Run locally

Serve from the folder **root** (relative asset paths; `file://` won't work):

```bash
npm run dev               # http://localhost:8012  (npx serve)
# or
python3 -m http.server 8012
```

Use Chrome or Edge (WebCodecs + H.264).

## How it works

100% client-side — no server, no upload, no account, no limit.

- `index.html` / `styles.css` — Brainfish UI; Satoshi self-hosted in `fonts/`.
- `app.js` — UI wiring (pick/drag-drop → dimension validation → progress → preview → download).
- `engine.js` — processing pipeline, exposed as `window.PrismaWM`:
  1. **demux** the MP4 with MP4Box → encoded frames
  2. **decode** with WebCodecs `VideoDecoder`
  3. **remove** the watermark per frame via adaptive **inverse-alpha un-compositing**
     (estimate opacity → lift the mark → edge-clean the seam) — not a blur
  4. **encode** H.264 (`VideoEncoder`) + **mux** to MP4 (mp4-muxer), audio passed through
  5. return an MP4 `Blob` for preview + download
- `vendor/` — MP4Box.js + mp4-muxer (lazy-loaded on first run).
- `watermarks/` — spark templates (48px = 720p, 84px = 1080p).

## Notes

- Removes the **visible** mark only; invisible provenance (e.g. SynthID) is untouched.
- Supported input sizes are exact; other sizes are rejected in the UI.
- Independent tool — not affiliated with Google, Gemini, or any AI video provider.

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