/render-multiworld

name: render-multiworld
description: Assemble a silent, music-led 3-world product-tour ad — trim and hard-cut-concat the per-world WIDE-arrival + top-down-macro clips, composite the HTML/Playwright brand end card (approved headline + handwritten product labels + arrows) over an AI flat-lay background, and mux one music bed into a 720x1280 web master. FREE, deterministic assembly (Playwright + PIL/HTML + FFmpeg); the recipe supplies the config and gates the paid clip/background/music calls. Use for the multiworld-product-tour format.
status: active

render-multiworld

Assemble a silent, music-led "multi-world product tour" ad (≈27s, 9:16) — a tour of three distinct "third-place" worlds (chosen per video), one per product/variant, that lands on a Pinterest-style brand end card. Each world is a **two-shot pair**: a ~4.5s WIDE kinetic-calm ARRIVAL (the environment dominates, the product stays small) hard-cutting to a ~3.5s top-down MACRO product MOMENT (the sealed product nested with its companion prop). Variant identity is carried by the **world + companion prop**, not by product color. No VO, no captions in the scenes — one music bed carries the whole thing.

This capability is the **FREE, deterministic assembler**. The paid steps — the six per-world clips, the AI flat-lay end-card background, the ElevenLabs music bed — are separate capabilities (see the gap below for the clips); the recipe orchestrates and gates them.

Choices

The calling recipe asks the user these before any paid step; this capability only assembles what they produced. The worked example (the fictional brand Kettle & Fern) values are examples, never defaults.

• **worlds** — the three places toured → `config.worlds`, `config.scene_grid` (demo: reading

nook / glasshouse / farmers market).

• **visual_style** — the worlds' look → `config.visual_style`, `worlds[*].palette`,

`end_card.nb2_prompt` (demo: sunlit-natural / handmade).

• **music** — the bed's genre/mood → `config.music.prompt` (demo: warm acoustic-pop).

Nothing in the assembly keys on world slugs or names: clips are ordered by `scene_grid[].scene`, and the end-card copy is whatever `end_card.overlay` holds.

Run

1. **Trim clips (FFmpeg, FREE)** — trim each per-world clip to its `scene_grid[].duration_sec` (arrival 4.5 / macro 3.5), re-encode to the master spec (720×1280, 24fps, yuv420p, scale+pad, audio stripped). Trimming the macro so the top-down portion dominates also hides any label misrender at the clip's upright tilt extreme. 2. **End card (Playwright/HTML, FREE)** — screenshot `end_card.html` over the AI flat-lay BACKGROUND, then FFmpeg-encode to a `dwell_sec` (3.0s) static clip. Headline (`overlay.headline`, approved brand copy — the demo's was "STEEP SLOWER."; Inter 900), one handwritten Caveat product label + hand-drawn SVG arrow per product, Playfair wordmark + URL. **End-card text is HTML, NEVER AI-rendered** — the AI step produces the background only. 3. **Hard-cut concat (FFmpeg, FREE)** — concat the six trimmed clips in scene order (S01 arrival → S02 macro → … → S06 macro) + the end-card clip. Hard cuts (no dissolves), normalized to one fps/codec first so concat-copy is safe. 4. **Music mux + web encode (FFmpeg, FREE)** — mux the single instrumental bed onto the silent concat with `afade` in/out + `loudnorm I=-16:TP=-1.5:LRA=11`, AAC 192k, clamped to 27.0s, explicit single-audio map so no silent scene-track leaks in → the H.264 (+ AAC) 720×1280 master.

Contract

• Deterministic + FREE (Playwright + PIL/HTML + FFmpeg); no paid calls, no AI-rendered

end-card text. Iterate the cut for free by re-running the assembly.

• **Silent, music-led** — no VO, no captions during the scenes; on-screen text appears

ONLY on the end card, HTML-composited.

• Per world = WIDE arrival (product small, environment dominant) → top-down macro (product +

botanical, no hands). Hard cuts between scenes; end card is a static hold with legible HTML text; music starts at t=0 and fades the tail.

• **Sealed-product rule** is enforced at QC — trim/concat can't fix an opened or spilling

clip; that's a re-roll (paid), not an assembly fix. Identity via world + botanical, never pack color.

• The template recipe (DB) supplies the per-video config (worlds, palettes, companion props

and music mood from the user's choices; prompts; end-card copy from the brand kit); this capability is the generic assembler.

Gaps / routing notes

• **Update:** the current recipe makes the six clips with `create-image-fal` (nano_banana_2

keyframe edit grounded on the real `product_image`) → `create-video-fal` (Kling 3.0 i2v), so the gap below only applies to reproducing the demo's Higgsfield build exactly.

• **The demo's clips used a Higgsfield-proxy capability that does not exist.** The

source molecule fires them through **Higgsfield Marketing Studio** (`marketing_studio_video/product_showcase`) grounded on imported product UUIDs, with the sealed-product safety block front-loaded on every prompt. `create-video-fal` is a FAL i2v proxy — a different provider and job shape — so it cannot serve this step. Wiring the clip step to templates-as-data requires a Higgsfield video proxy (Marketing Studio `product_showcase`, imported-product grounding, per-prompt safety block) that **does not exist yet**. Until it lands, the clips are generated via the Higgsfield Marketing Studio path directly (CLI/MCP) and that step is **not a fetchable capability**.

• **The end-card background** is an AI flat-lay render (text-free, all three sealed products +

botanicals) that in prod routes through **create-image-fal** (NB2); only the HTML text overlay + encode run locally as FREE assembly.

• **The music** is a paid ElevenLabs call that in prod routes through

**create-music-elevenlabs**; only the loudnorm + fade + mux run locally as FREE assembly.

See `scripts/PIPELINE.md` for the full config-field → source-step map and `scrip