feat(remotion): FlexStory scene engine — ordered editable scene-blocks (Phase 1)
Turns a template into an ordered list of editable scene blocks instead of one monolithic composition — the foundation for the scene-based template engine (all Renderforest-style types, per-scene editable duration, add/duplicate/ delete/reorder). Render-side only; backend wiring is Phase 2. - src/scenes/types.ts: SceneInstance/BlockProps/SceneBlock + withDefaults/clamp. - src/scenes/chrome.tsx: shared 2.5D Three.js backdrop (parallax camera, blobs, particles, optional 3D confetti) + grain/vignette/progress/kicker/transition. - src/scenes/blocks/*: Core 6 blocks — TitleCard, CharacterScene (full room + vendored CC0 character behind a desk), ImageCaption, KineticQuote, Slideshow, OutroCTA — each with editable fields + its own duration range. - src/scenes/registry.ts: the block registry (blockId -> block). - src/compositions/FlexStory.tsx: the sequencer — stacks blocks in <Sequence>, clamps per-scene duration, and computes composition length dynamically via calculateMetadata (so add/delete/reorder/duration all flow to the render). - StoryScenes.tsx: the 2.5D story proof this productizes; docs/TEMPLATE_BRIEF.md: the guided creator flow + Template Spec. Verified: all 6 blocks render via FlexStory in 16:9/1:1/9:16; a custom props override (reordered scenes, custom characters/durations/colors) renders correctly and the total length tracks Σ per-scene durations. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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# FlatRender — Template Brief & Creator Flow
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The single, repeatable entry point for creating a template. A **guided Q&A** captures
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requirements into a structured **Template Spec**; the Spec drives the build pipeline
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(see `flat-artist` skill + `ASSET_LIBRARY.md`). The Spec is the stable contract — today a
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human fills it via Q&A and the Flat Artist hand-builds; later an AI prompt or an end-user
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form can emit the same Spec into the same pipeline (internal-first, extensible).
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> **Engine model (confirmed):** a template is a **scene list**. Each scene is a reusable,
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> typed **scene block** with its own content + **editable duration** (within a min/max
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> range). A template ships in one of two structure modes:
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> - **fixed** — a static set/order of scenes (user edits content + duration, can't add/remove/reorder).
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> - **flexible** — user can **add / duplicate / delete / reorder** scenes and add as many as needed; empty scenes auto-skip.
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> Every template renders in all three aspects (16:9 / 1:1 / 9:16), re-flowed not letterboxed, Persian-first.
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---
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## The guided Q&A (5 rounds)
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Each round ≈ one `AskUserQuestion` call (≤4 questions), mostly multiple-choice with a
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"recommended default" so it's fast. Run them in order.
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### Round 1 — Purpose & format
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- **Type / use-case** — explainer/story · promo/sale · logo reveal · social/channel intro · greeting/seasonal · product/app showcase · quote · event invite · slideshow · countdown · testimonial · (any Renderforest-style type).
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- **Aspect priority** — all three equally (default) · 9:16-first · 16:9-first.
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- **Structure mode** — flexible (add/duplicate/delete/reorder) · fixed (static order).
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- **Scene count & per-scene duration** — default scene count + the editable **duration range** per scene (e.g. default 3s, min 1s, max 6s).
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### Round 2 — Art direction
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- **Visual style** — refined flat 2.5D (Remotion+Three) · 3D cinematic · minimal-luxury · kinetic typography.
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- **Palette & mood** — sophisticated muted · dark premium + glow · warm editorial · vibrant · brand blue/violet · custom hex.
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- **Characters** — CC0 Open-Peeps busts (vendored) · none · abstract · Humaaans full-body (needs manual fetch).
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- **Environment/setting** — room/office · outdoor · abstract/studio · per-scene varied.
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### Round 3 — Content
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- **Per-scene structure** — story beats · single hero message · feature list · before/after.
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- **Copy** — provide now · Persian placeholders to refine.
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- **Brand assets** — logo upload field? · image/screen upload field? · none.
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- **Hook** — what happens in the first 1–2s (the scroll-stopper).
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### Round 4 — Motion / audio / finishing
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- **Motion intensity & pacing** — calm · energetic · cinematic.
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- **Audio** — music + SFX (beat-synced?) · silent.
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- **Finishing** — grain · vignette · glow defaults (on/off).
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- **Reference** — any link/inspiration to match.
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### Round 5 — Editability & taxonomy
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- **Editable fields** — which text keys, colors, images, and whether scene-count is user-editable.
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- **Taxonomy** — category · tags · slug.
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- **Naming** — fa + en name/description.
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- **Tier** — free · premium.
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---
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## Template Spec (the output)
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The Q&A produces this structure, saved to `services/remotion/briefs/<slug>.md`:
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```jsonc
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{
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"id": "CharacterPromo", // PascalCase comp id
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"slug": "fr-character-promo",
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"type": "promo", // Round 1
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"name_fa": "…", "name_en": "…",
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"desc_fa": "…", "desc_en": "…",
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"aspectPriority": "all",
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"structure": "flexible", // "flexible" | "fixed"
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"scene": { "defaultCount": 4, "durationDefaultSec": 3, "durationMinSec": 1, "durationMaxSec": 6 },
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"art": { "style": "flat-2.5d", "palette": "muted", "characters": "openpeeps", "environment": "room" },
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"blocks": [ // ordered scene blocks (defaults; flexible = user edits the list)
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{ "type": "intro", "role": "hook" },
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{ "type": "feature", "role": "point" },
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{ "type": "feature", "role": "point" },
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{ "type": "cta", "role": "outro" }
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],
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"content": { /* per-block editable keys -> Persian default values */ },
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"colors": { "accentColor": "#…", "secondaryColor": "#…", "backgroundColor": "#…", "textColor": "#…" },
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"assets": { "characters": ["dicebear/openpeeps-04"], "logoUpload": false, "imageUpload": false },
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"motion": { "intensity": "energetic", "audio": "music+sfx" },
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"finishing": { "grain": true, "vignette": true, "glow": false },
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"editable": { "text": true, "colors": true, "images": false, "sceneCount": true },
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"taxonomy": { "category": "…", "tags": ["…"], "tier": "premium" }
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}
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```
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This Spec maps directly onto the build pipeline: `blocks` → kit scene-block components;
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`content`/`colors` → Zod props (globally-unique keys) + the studio editable fields;
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`scene.*` → per-scene duration range + structure mode; seeded via
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`scripts/seed_remotion_templates.py` (`content.scenes` rows carry `default_duration_sec`
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and `sort`/order).
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