Lazy Frames

Agentic video generation. Feed a skill URL to your AI agent — it captures, authors a spec, runs the gates, and renders a pixel-perfect MP4. The core runs fully locally with no keys; reviewed plugins can opt into explicitly declared external services.

Same spec + same machine = byte-identical MP4, every time.

Part of CosmicStack.AI.

Give it to your agent

Paste the raw Markdown skill URL into your AI agent:

https://lazy-frames.cosmicstack.ai/skill.md

For example: Read this skill, then make a promo video for https://example.com.

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Install

From npm

npm install lazy-frames

Then run any command via npx:

npx lazy doctor
npx lazy capture https://example.com projects/acme
npx lazy render projects/acme

From source (for development or the agentic skill)

git clone https://github.com/cosmicstack-labs/lazy-frames.git
cd lazy-frames
npm install && npm run build
node packages/cli/dist/index.js doctor

Prerequisites

Dependency	Required for	Check
Node.js ≥ 20	CLI + engine	node --version
ffmpeg + ffprobe	encoding + audio	ffmpeg -version
Google Chrome	headless rendering	lazy doctor (Windows: Chrome/Edge in Program Files, or CHROME_PATH)
Python 3	audio sidecar (music, TTS, SFX)	python3 --version or python --version; override with LAZY_PYTHON
Local TTS	narration (say or Windows SAPI)	lazy doctor
ELEVENLABS_API_KEY	Optional ElevenLabs plugin	lazy doctor

Run npx lazy doctor to verify all providers and see your hardware tier.

Quick start

Website promo — from URL to MP4

npx lazy capture https://example.com projects/acme
npx lazy snapshot projects/acme --update
npx lazy check projects/acme
npx lazy preview projects/acme       # review in browser
# ... approve ...
npx lazy render projects/acme         # byte-stable MP4

lazy capture writes screenshots @2x, palette, copy blocks, fonts, logo, and a starter spec.json.

Cinematic — generated stills + depth parallax + audio

npx lazy gen image -p projects/cine --seed 21 --style ridge --name r01
npx lazy gen music -p projects/cine --mood calm --bpm 90 --seed 21 --name bgm
# write spec.json referencing assets/gen/r01.png + r01.depth.png
npx lazy render projects/cine

Plugin marketplace

The Lazy Frames Plugin Marketplace indexes folder-owned, schema-validated extensions and their exact permissions. ElevenLabs is the only plugin included by default; running install grants project-scoped approval for external access:

npx lazy plugin install elevenlabs -p projects/cine
export ELEVENLABS_API_KEY="your-key"
npx lazy script projects/cine --provider elevenlabs --voice YOUR_VOICE_ID --apply
npx lazy render projects/cine

Each narration beat is anchored with sceneId and offsetMs, so the spoken line starts on the intended screen. Generated audio is normalized to canonical WAV and cached; the API key is never written to project files. Plugin dependencies are fingerprint-locked in the project, while consent is stored separately as a user-local, project-scoped approval.

Browse 16 plugins across voice, storytelling, visuals, audio, captions, and delivery, or run npx lazy plugin search. The other integrations are installable scaffolds: their manifests and permission locks work now, while execution remains blocked until a reviewed adapter ships.

Contributors add one self-contained plugins/<id>/manifest.json folder and run npm run plugins:build; the CLI registry, machine index, marketplace card, and detail page are generated from that folder.

CLI commands

Command	What it does
lazy doctor	Environment + provider capability report
lazy capture <url> [project]	Capture a website → screenshots, palette, copy, starter spec
lazy gen image	Generate procedural still + matching depth map
lazy gen music	Generate procedural music WAV
lazy gen tts	Generate TTS narration WAV (macOS say or Windows SAPI)
lazy script <project>	Draft editable, scene-linked narration beats
lazy plugin search	Search reviewed plugins by name or capability
lazy plugin info <id>	Inspect status, provider, permissions, and detail URL
lazy plugin install <id>	Install a fingerprinted plugin into a project
lazy check <project>	Validate spec + run snapshot & determinism gates
lazy snapshot <project> --update	Establish/refresh the regression baseline
lazy render <project>	Render to MP4 (byte-stable, with audio)
lazy preview <project>	Scrubbable timeline preview at localhost:4173, with mixed audio when the spec has it

Scene types

Type	What it does
typography	Text reveals: titles, quotes, lockups (4 reveal styles)
stat-hit	Count-up numbers, labels, bars
browser-frame	Screenshot in a browser chrome mockup with cursor
ui-callout	Screenshot with dimmed mask, hotspot spotlight, label
atmosphere	Drifting gradient blobs — ambient backdrops
parallax	2.5D camera move over a still (flat or depth-map mode)
video-layer	Footage playback with trim, speed, grade
three-scene	Deterministic 3D: cube/ico/grid/particles (canvas 2D)

Plus: 7 transitions (cut, fade, dissolve, whip-pan, light-leak, dip-to-black, luma-wipe), stage-level CSS grade presets, output-level 3D LUT pipeline, and declarative audio (narration + music + SFX).

Agentic skill

Lazy Frames ships with a complete agent skill. Point any coding agent at skill/SKILL.md — it contains the full routing rules, agent contract, and reference docs. The agent reads the skill (not the source code) and knows how to capture, author, check, preview, and render.

skill/
  SKILL.md                    ← entry point + routing + agent contract
  references/
    spec-format.md             ← full spec schema
    scene-types.md             ← all 8 scene types
    workflows.md               ← website-promo / cinematic / edit
    cli.md                     ← every CLI command
    gates.md                   ← determinism + snapshot gates

Determinism

Same spec + same machine = byte-identical MP4 (SHA-256 verified). Enforced by:

• --jitless — V8 interpreter only (no JIT nondeterminism)
• --use-angle=swiftshader — software rendering (no GPU variance)
• Integer-pixel CSS transforms (no sub-pixel text rendering)
• putImageData for canvas scenes (no skia compositing nondeterminism)
• Bitexact ffmpeg encoding (fixed creation_time, +bitexact, fixed threads)

Examples

• examples/demo — typography + stat-hit (engine proof)
• examples/cinematic — depth-parallax + video-layer + narration + music
• examples/showreel — grade + LUT + transitions + SFX + 3D + beats
• projects/web-demo — website capture → promo

Verify

npm run verify:demo        # byte-stability (two renders, sha256 compare)
npm run verify:cinematic   # gen assets + gates + audio determinism

Architecture

spec.json (typed JSON)
  ├─ @lazy/engine       compile spec → HTML composition + channel data
  ├─ @lazy/renderer     headless Chrome (jitless + swiftshader) → frames → ffmpeg → MP4
  ├─ @lazy/capture      site screenshots + palette/copy/font/logo extraction
  ├─ @lazy/gen-sidecar  Python: procedural music, TTS (say), SFX synthesis
  └─ @lazy/cli          lazy capture | gen | check | snapshot | render | preview | doctor

License

MIT © CosmicStack Labs