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mk:html-video

mk:html-video is a skill for Claude Code from ngocsangyem/MeowKit. It costs 106 tokens per session (718 once invoked), scanned A, original, MIT.

A rendering workflow that turns a local HTML, CSS, and JavaScript animation into an MP4 video. MP4 is a common video file format.

In plain words
What is it for?
Use it to capture deterministic HTML animations, canvas, WebGL, or GSAP scenes and encode them as H.264 MP4.
Why use it?
It lets you export web-based animations as shareable video files rather than viewing them only in a browser.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: reads .claude/ paths.

not rated 14repo 1mo ago A scan 106 tokens original MIT

Good fit Use it to capture deterministic HTML animations, canvas, WebGL, or GSAP scenes and encode them as H.264 MP4.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/ngocsangyem/meowkit/html-video
View source ↗ ngocsangyem/MeowKit docs.meowkit.dev
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add ngocsangyem/MeowKit --skill html-video
Clone the repo
git clone --depth 1 https://github.com/ngocsangyem/MeowKit

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for mk:html-video

README.md
[![agentmods](https://agentmods.dev/badge/skills/ngocsangyem/meowkit/html-video/github.svg)](https://agentmods.dev/skills/ngocsangyem/meowkit/html-video)
Your own site
<a href="https://agentmods.dev/skills/ngocsangyem/meowkit/html-video"><img src="https://agentmods.dev/badge/skills/ngocsangyem/meowkit/html-video/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for mk:html-video

Your own site · 80×15
<a href="https://agentmods.dev/skills/ngocsangyem/meowkit/html-video"><img src="https://agentmods.dev/badge/skills/ngocsangyem/meowkit/html-video.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 106 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 718 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00106 $0.00718
Opus 5 $0.00053 $0.00359
Sonnet 5 $0.00021 $0.00144
Haiku 4.5 $0.00011 $0.00072

Measured 5d ago against content hash 12f7ba99aada, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

mk:html-video scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/capture-frames.mjs, scripts/render-html-to-mp4.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/html-video/SKILL.md · 59 lines

What it actually says

HTML → MP4 Render Pipeline

Render a local HTML/CSS/JS animation to MP4 with Playwright frame capture and ffmpeg encoding.

Route by Intent

  • Check dependencies or choose dimensions/fps: load render workflow.
  • Implement deterministic JavaScript, canvas, WebGL, or GSAP animation stepping: load template contract.
  • Capture frames directly: execute node .claude/skills/html-video/scripts/capture-frames.mjs <html-file> <frame-dir> <fps> <duration-seconds> <width> <height> [background-color].
  • Render a complete MP4: execute bash .claude/skills/html-video/scripts/render-html-to-mp4.sh <html-file> <output.mp4> [fps] [duration-seconds] [width] [height] [background-color].
  • Resolve module, file://, codec, cleanup, or dimension failures: load troubleshooting.

Quick Start

bash .claude/skills/html-video/scripts/render-html-to-mp4.sh template.html output.mp4 30 5 1920 1080

The final optional argument supplies a background colour. The script captures fps × duration PNG frames, encodes H.264 MP4 with yuv420p, cleans its temporary frame directory, and prints the output path.

Delivery

  1. Verify ffmpeg and Playwright before rendering; install Chromium only when missing and only with user approval.
  2. Use an even viewport width and height.
  3. Prefer a window.onFrame hook for fast deterministic animation; otherwise capture runs at real time.
  4. Verify the MP4 with the ffprobe command in render workflow.

Gotchas

  • This is a skill, not an npm package: execute its bundled scripts directly.
  • Do not use it for live browser recording, screen recording, or AI video generation.
  • See troubleshooting for cleanup and file-origin limitations.
Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 59 lines · 106 tokens per session scan A 12f7ba99aada

Subscribe to this mod's changes

mk:html-video is a skill published in the GitHub repository ngocsangyem/MeowKit (14 stars, last pushed 1mo ago), licensed MIT. It adds 106 tokens to every session and 718 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

CSS and stylingCreative and mediaFrontendaiai-agentsanimation-renderautomationclaudecss-animationffmpeg-encodeframe-capturehtml-canvashtml-to-videomp4-exportplaywright-capture
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