remotion

name	remotion
description	[User-Invoked] Use when you need create, update, or preview Remotion videos.

Codex compatibility note:

• Invoke repository skills with $skill-name in Codex; this mirrored copy rewrites legacy Claude /skill-name references.
• Prefer the plan-hard skill for planning guidance in this Codex mirror.
• Task tracker mandate: BEFORE executing any workflow or skill step, create/update task tracking for all steps and keep it synchronized as progress changes.
• User-question prompts mean to ask the user directly in Codex.
• Ignore Claude-specific mode-switch instructions when they appear.
• Strict execution contract: when a user explicitly invokes a skill, execute that skill protocol as written.
• Subagent authorization: when a skill is user-invoked or AI-detected and its protocol requires subagents, that skill activation authorizes use of the required spawn_agent subagent(s) for that task.
• Do not skip, reorder, or merge protocol steps unless the user explicitly approves the deviation first.
• For workflow skills, execute each listed child-skill step explicitly and report step-by-step evidence.
• If a required step/tool cannot run in this environment, stop and ask the user before adapting.

Codex Project-Reference Loading (No Hooks)

Codex does not receive Claude hook-based doc injection. When coding, planning, debugging, testing, or reviewing, open project docs explicitly using this routing.

Always read:

• docs/project-config.json (project-specific paths, commands, modules, and workflow/test settings)
• docs/project-reference/docs-index-reference.md (routes to the full docs/project-reference/* catalog)
• docs/project-reference/lessons.md (always-on guardrails and anti-patterns)

Situation-based docs:

• Backend/CQRS/API/domain/entity changes: backend-patterns-reference.md, domain-entities-reference.md, project-structure-reference.md
• Frontend/UI/styling/design-system: frontend-patterns-reference.md, scss-styling-guide.md, design-system/README.md
• Spec/test-case planning or TC mapping: feature-docs-reference.md
• Integration test implementation/review: integration-test-reference.md
• E2E test implementation/review: e2e-test-reference.md
• Code review/audit work: code-review-rules.md plus domain docs above based on changed files

Do not read all docs blindly. Start from docs-index-reference.md, then open only relevant files for the task.

[IMPORTANT] Use task tracking to break ALL work into small tasks BEFORE starting. For simple tasks, ask user whether to skip. MUST ATTENTION wait for user approval of scene plan (Step 3.3) before writing any files — NEVER skip. MUST ATTENTION read existing project files before modifying — NEVER overwrite scenes blindly. MUST ATTENTION update totalChapters in ALL existing scene files when adding/removing scenes.

Be skeptical. Apply critical thinking. Every claim needs traced proof, confidence >80% to act.

---

Quick Summary

Goal: Create new Remotion video project, add/update scenes in existing one, or launch local Remotion Studio preview server.

Two Modes:

Mode	When	Action
Create / Update (default)	User describes video content OR asks to update/add scenes	Scaffold new project or modify existing scenes
Play	User says "play", "preview", "open studio", "watch", "start server"	Find Remotion project → npm run studio

Default project path: remotion/ (relative to workspace root). Respect any path user explicitly provides.

Key Rules:

• NEVER implement scenes before user approves the plan (Step 3.3)
• Always read existing project structure before adding/modifying scenes
• Keep totalChapters consistent across ALL scene files
• All animations MUST be driven by useCurrentFrame() — CSS transitions FORBIDDEN
• Always use Remotion components (<Img>, <Video>, <Audio>) instead of native HTML elements

Implementing one of these? Copy from refs/ — do NOT implement from memory:

Implementing...	Copy from
src/components/Shared.tsx (new scaffold)	refs/Shared.tsx — C palette, ProgressBar, ChapterBadge, CodeBlock, Pill, AnimRow
src/utils/animations.ts (new scaffold)	refs/animations.ts — easeOut, easeInOut, pop, staggeredEaseOut, counter
Typewriter or word-highlight text effect	refs/text-animations.tsx — getTypedText, Cursor, TypewriterScene, Highlight
TikTok-style captions with word highlight	refs/captions.tsx — CaptionedVideo, CaptionPage, delayRender, createTikTokStyleCaptions
Video/audio duration, dimensions, frames	refs/mediabunny-utils.ts — getVideoDuration, getAudioDuration, getVideoDimensions, canDecode, extractFrames
Mapbox map scene	refs/maps-mapbox.tsx — MapScene component, interactive:false, camera animation
ElevenLabs TTS voiceover generation	refs/generate-voiceover.ts — TTS script + calculateMetadata integration

---

Phase 0: Mode Detection

Classify prompt:

PLAY keywords   → "play", "preview", "open studio", "start server", "watch", "launch", "dev server"
CREATE/UPDATE   → everything else (default)

Ambiguous → proceed with Create/Update (safe default).

---

Phase 1A: Detect Existing Project

Locate Remotion project before acting:

# Check default path
ls remotion/package.json 2>/dev/null

# Check if CWD is already a Remotion project
ls package.json 2>/dev/null | xargs grep -l '"remotion"' 2>/dev/null

# Check common paths
find . -maxdepth 3 -name "package.json" -exec grep -l '"remotion"' {} \; 2>/dev/null | head -5

State after detection:

• PROJECT_EXISTS = true/false
• PROJECT_PATH = remotion/ (default) or detected path
• HAS_STUDIO_SCRIPT = true/false (check package.json scripts.studio)

---

Phase 2: PLAY Mode

When: User explicitly asks to preview / open studio / launch dev server.

Step 2.1 — Verify project exists

If PROJECT_EXISTS = false:

"No Remotion project found. Run $remotion <description> to create one first." Exit.

Step 2.2 — Find launch command

cat {PROJECT_PATH}/package.json | grep '"studio"'
# → use: npm run studio
# → fallback: npx remotion studio

Step 2.3 — Start dev server (background)

cd {PROJECT_PATH} && npm run studio

Remotion Studio launches at http://localhost:3000

Server runs in background. Report URL and composition IDs visible in src/Root.tsx.

Step 2.4 — Optional: one-frame render check

npx remotion still [composition-id] --scale=0.25 --frame=30
# At 30fps, --frame=30 = one-second mark (zero-based)

---

Phase 3: CREATE / UPDATE Mode

Step 3.1 — New vs Update Decision

Condition	Action
PROJECT_EXISTS = false	Scaffold new project → Phase 3.2
PROJECT_EXISTS = true	Read existing project → Phase 3.4

---

Step 3.2 — Scaffold New Project

Only when no existing Remotion project found.

3.2.1 Bootstrap with create-video (preferred)

# Creates {PROJECT_PATH}/ with blank template (no Tailwind)
npx create-video@latest --yes --blank --no-tailwind {PROJECT_PATH}
cd {PROJECT_PATH}
npm install @remotion/transitions  # add transitions support

Replace generated src/ with project structure below (keep package.json and tsconfig.json from scaffold).

Fallback (manual) — when npx create-video unavailable

mkdir -p {PROJECT_PATH}/src/compositions {PROJECT_PATH}/src/components {PROJECT_PATH}/src/utils
cd {PROJECT_PATH}
npm init -y
npm install remotion @remotion/cli @remotion/transitions react react-dom
npm install -D @types/react @types/react-dom typescript

Directory structure (both paths)

{PROJECT_PATH}/
  package.json          ← scripts: studio, render, still
  tsconfig.json
  src/
    index.ts            ← registerRoot
    Root.tsx            ← register compositions
    components/
      Shared.tsx        ← palette + reusable UI components
    utils/
      animations.ts     ← easeOut, staggeredEaseOut, pop, counter
    compositions/
      {CompositionName}.tsx

3.2.3 Create package.json scripts (merge into existing after install)

{
    "scripts": {
        "studio": "remotion studio",
        "render": "remotion render {CompositionId} out/video.mp4",
        "still": "remotion still {CompositionId} --frame=0 out/still.png"
    },
    "remotion": {
        "entryPoint": "src/index.ts"
    }
}

3.2.4 Create tsconfig.json

{
    "compilerOptions": {
        "target": "ES2020",
        "lib": ["dom", "ES2020"],
        "jsx": "react-jsx",
        "module": "commonjs",
        "moduleResolution": "node",
        "strict": true,
        "esModuleInterop": true,
        "skipLibCheck": true,
        "outDir": "dist"
    },
    "include": ["src"]
}

3.2.5 Create src/index.ts

import { registerRoot } from 'remotion';
import { Root } from './Root';
registerRoot(Root);

3.2.6 Create src/components/Shared.tsx

Copy from refs/Shared.tsx — do NOT implement from memory. Exports: C (palette), ProgressBar, ChapterBadge, CodeBlock, Pill, AnimRow. Always create; all scenes import from here.

3.2.7 Create src/utils/animations.ts

Copy from refs/animations.ts — do NOT implement from memory. Exports: easeOut, easeInOut, pop, staggeredEaseOut, counter.

---

Step 3.3 — Plan Composition Structure

MUST ATTENTION wait for user confirmation before implementing any scenes.

Plan composition before writing files:

1. Parse intent — What video about? What information to convey?
2. Decide scene count — 1 scene per major concept (30s → ~4 scenes, 60s → ~8, 90s → ~12)
3. Assign durations — Each scene: 6–12s (180–360 frames @ 30fps)
4. Name scenes — Scene01Intro, Scene02{Topic}, etc.
5. Write scene brief — what shown, key data, visual layout (left/right split, full-width, grid)

Present plan before writing files:

Proposed: {N} scenes, ~{total}s total
  Scene 01 ({Xs}) — {topic}: {layout description}
  Scene 02 ({Xs}) — {topic}: {layout description}
  …
Proceed? (or adjust)

---

Step 3.4 — Read Existing Project (UPDATE path)

MUST ATTENTION read existing project state before any modifications.

When PROJECT_EXISTS = true:

# Read composition registry
cat {PROJECT_PATH}/src/Root.tsx

# List scene files
ls {PROJECT_PATH}/src/compositions/ 2>/dev/null || ls {PROJECT_PATH}/src/scenes/ 2>/dev/null

# Read main composition orchestrator
cat {PROJECT_PATH}/src/ClaudeAgentExplainer.tsx 2>/dev/null  # or equivalent

Identify:

• Existing scene count and names
• Current totalChapters / composition duration
• Where to insert / which scenes to modify

Target only scenes affected by user's request. Preserve all unchanged scenes.

---

Step 3.5 — Implement Scene Files

Scene file anatomy (follow exactly)

import { AbsoluteFill, useCurrentFrame, interpolate } from 'remotion';
import { C, ProgressBar, ChapterBadge } from '../components/Shared';  // adjust path
import { easeOut, staggeredEaseOut } from '../utils/animations';       // adjust path

// Data arrays at the top — keep out of component body
const ITEMS = [ ... ];

export const Scene{NN}{Name}: React.FC = () => {
    const frame = useCurrentFrame();

    return (
        <AbsoluteFill style={{ background: C.bg, fontFamily: 'system-ui, -apple-system, sans-serif' }}>
            <ChapterBadge index={NN} label="{Scene Name}" color={C.blue} />

            <div style={{ position: 'absolute', inset: 0, display: 'flex', gap: 48, padding: '68px 72px 44px' }}>
                {/* Content here */}
            </div>

            <ProgressBar chapterIndex={NN - 1} totalChapters={TOTAL} />
        </AbsoluteFill>
    );
};

Animation rules

Element	Pattern
Eyebrow label	opacity: easeOut(frame, 0, 14)
Hero title	opacity: easeOut(frame, 8, 22) + translateY from 28→0
Subtitle	opacity: easeOut(frame, 22, 18)
List items (stagger)	staggeredEaseOut(frame, i, startAt, 12, 16)
Cards (stagger up)	staggeredEaseOut + translateY(20→0)
Cards (stagger right)	staggeredEaseOut + translateX(28→0)
Late callout boxes	easeOut(frame, 90+, 18)

Layout patterns

Left/Right split (most common):

<div style={{ position: 'absolute', inset: 0, display: 'flex', gap: 48, padding: '68px 72px 44px' }}>
    <div style={{ width: 400, flexShrink: 0, ... }}>  {/* Left panel */}
    <div style={{ flex: 1, ... }}>                     {/* Right panel */}
</div>

Full-width column:

<div style={{ position: 'absolute', inset: 0, display: 'flex', flexDirection: 'column', padding: '68px 64px 44px', gap: 16 }}>

Centered (title/CTA scene):

<div style={{ position: 'absolute', inset: 0, display: 'flex', flexDirection: 'column', justifyContent: 'center', alignItems: 'center', padding: '72px 100px', textAlign: 'center' }}>

Card grid:

<div style={{ display: 'grid', gridTemplateColumns: 'repeat(4, 1fr)', gap: 12 }}>

Color and font guidelines

Element	fontSize	fontWeight	Notes
Eyebrow label	14	700	category color, letterSpacing: 3
Hero title	44–56	800	C.text, lineHeight: 1.1
Body text	17–21	400	C.dim, lineHeight: 1.6
Card label	15–16	700	category color
Monospace detail	12–14	400	fontFamily: 'Courier New'
Card container	—	—	C.surface, borderLeft: 3px solid color, borderRadius: 10–12

---

Step 3.6 — Wire Root.tsx

Multi-scene composition (with transitions)

import { TransitionSeries, linearTiming } from '@remotion/transitions';
import { fade } from '@remotion/transitions/fade';
import { Scene01Intro } from './compositions/Scene01Intro';
// ... other imports

const T = 18; // transition duration in frames

const D = {
    s01: 210, // 7s
    s02: 240 // 8s
    // ...
};

const SCENES = Object.values(D).length;
export const TOTAL_DURATION_FRAMES = Object.values(D).reduce((a, b) => a + b, 0) - (SCENES - 1) * T;

const tr = () => <TransitionSeries.Transition presentation={fade()} timing={linearTiming({ durationInFrames: T })} />;

export const {
    CompositionName
}: React.FC = () => (
    <TransitionSeries>
        <TransitionSeries.Sequence durationInFrames={D.s01}>
            <Scene01Intro />
        </TransitionSeries.Sequence>
        {tr()}
        <TransitionSeries.Sequence durationInFrames={D.s02}>
            <Scene02Next />
        </TransitionSeries.Sequence>
        {/* ... */}
    </TransitionSeries>
);

// Root.tsx
import { Composition } from 'remotion';
import { {CompositionName}, TOTAL_DURATION_FRAMES } from './{CompositionName}';

export const Root: React.FC = () => (
    <Composition id="{CompositionId}" component={{{CompositionName}}} durationInFrames={TOTAL_DURATION_FRAMES} fps={30} width={1920} height={1080} />
);

Single-scene composition

// Root.tsx
import { Composition } from 'remotion';
import { MyScene } from './compositions/MyScene';

export const Root: React.FC = () => <Composition id="MyVideo" component={MyScene} durationInFrames={300} fps={30} width={1920} height={1080} />;

---

Step 3.7 — Post-scaffold: launch prompt

After creating/updating, report changed files and offer launch:

✅ Created {N} scene files in {PROJECT_PATH}/src/compositions/
   Total duration: ~{X}s ({FRAMES} frames @ 30fps)

To preview: run `$remotion play` — starts Remotion Studio at http://localhost:3000
To render:  cd {PROJECT_PATH} && npm run render

---

Update Mode: Specific Scenarios

Add a new scene

1. Read Root.tsx to find composition orchestrator and current scene count
2. Read totalChapters across existing scenes
3. Determine insertion point (end = safest)
4. Create new scene file following anatomy above
5. Update Root / composition orchestrator:
   • Add import
   • Add D.sNN entry
   • Add <TransitionSeries.Sequence> block
   • MUST ATTENTION update totalChapters in ALL existing scene files (+1)

Modify an existing scene

1. Read specific scene file
2. Identify data array or JSX block needing change
3. Make surgical edits only — do not touch unrelated sections

Change visual style / palette

1. Edit src/components/Shared.tsx → C object
2. Font changes: update fontFamily in AbsoluteFill style per scene (or add global in Shared)

---

Remotion API Reference

Authoritative Remotion API reference — apply when implementing beyond basic scene creation.

---

Animations (Core Rules)

MUST ATTENTION ALL animations driven by useCurrentFrame(). Durations: seconds × fps.

import { useCurrentFrame, useVideoConfig, interpolate, Easing } from 'remotion';

export const FadeIn = () => {
    const frame = useCurrentFrame();
    const { fps } = useVideoConfig();
    const opacity = interpolate(frame, [0, 2 * fps], [0, 1], {
        extrapolateRight: 'clamp',
        extrapolateLeft: 'clamp',
        easing: Easing.bezier(0.16, 1, 0.3, 1)
    });
    return <div style={{ opacity }}>Hello World!</div>;
};

FORBIDDEN: CSS transition-*, CSS animation-*, Tailwind transition-*/animate-* classes.

---

Timing — interpolate & Bézier Easing

// With clamping + Bézier easing
const opacity = interpolate(frame, [0, 60], [0, 1], {
    easing: Easing.bezier(0.16, 1, 0.3, 1),
    extrapolateLeft: 'clamp',
    extrapolateRight: 'clamp'
});

Copy-paste curves:

easing: Easing.bezier(0.16, 1, 0.3, 1); // crisp UI entrance (strong ease-out)
easing: Easing.bezier(0.45, 0, 0.55, 1); // editorial / slow fade
easing: Easing.bezier(0.34, 1.56, 0.64, 1); // playful overshoot

Composing multiple properties from one progress:

const slideIn = interpolate(frame, [start, start + dur], [0, 1], {
    easing: Easing.bezier(0.22, 1, 0.36, 1),
    extrapolateLeft: 'clamp',
    extrapolateRight: 'clamp'
});
const overlayX = interpolate(slideIn, [0, 1], [100, 0]);
const opacity = interpolate(slideIn, [0, 1], [0, 1]);

---

Sequencing & Trimming

<Sequence> delays element appearance. useCurrentFrame() inside = local frame (0-based). Always premountFor:

<Sequence from={1 * fps} durationInFrames={2 * fps} premountFor={1 * fps}>
    <Title />
</Sequence>

<Series> for sequential without overlap:

<Series>
    <Series.Sequence durationInFrames={45}>
        <Intro />
    </Series.Sequence>
    <Series.Sequence durationInFrames={60}>
        <MainContent />
    </Series.Sequence>
    <Series.Sequence offset={-15} durationInFrames={60}>
        <SceneB />
    </Series.Sequence>{' '}
    {/* overlap */}
</Series>

Trimming:

<Sequence from={-0.5 * fps}><MyAnimation /></Sequence>       // skip first 15 frames
<Sequence durationInFrames={1.5 * fps}><MyAnimation /></Sequence>  // trim end
<Sequence from={30}><Sequence from={-15}><MyAnimation /></Sequence></Sequence>  // trim + delay

---

Compositions

import { Composition, Folder, Still } from "remotion";

<Composition id="MyComposition" component={MyComp} durationInFrames={100} fps={30} width={1080} height={1080} />

// With default props (use `type` not `interface`)
<Composition id="MyComposition" component={MyComp} durationInFrames={100} fps={30} width={1080} height={1080}
  defaultProps={{ title: "Hello World", color: "#ff0000" } satisfies MyCompositionProps}
/>

// Still (single-frame)
<Still id="Thumbnail" component={Thumbnail} width={1280} height={720} />

---

Assets — staticFile() & public folder

MUST use staticFile() for assets in public/:

import { Img, staticFile } from "remotion";
import { Video } from "@remotion/media";
import { Audio } from "@remotion/media";

<Img src={staticFile("logo.png")} />
<Video src={staticFile("clip.mp4")} />
<Audio src={staticFile("music.mp3")} />
// Remote URLs work directly — no staticFile needed

---

Images

MUST use <Img> from remotion — NOT <img>, NOT Next.js <Image>, NOT CSS background-image.

import { Img, staticFile } from "remotion";

<Img src={staticFile("photo.png")} style={{ width: 500, height: 300, objectFit: "cover" }} />
<Img src={staticFile(`frames/frame${frame}.png`)} />  // dynamic paths work

---

Videos

Install: npx remotion add @remotion/media

import { Video } from "@remotion/media";

<Video src={staticFile("video.mp4")} />
<Video src={staticFile("video.mp4")} trimBefore={2 * fps} trimAfter={10 * fps} />
<Video src={staticFile("video.mp4")} volume={(f) => interpolate(f, [0, fps], [0, 1], { extrapolateRight: "clamp" })} />
<Video src={staticFile("video.mp4")} playbackRate={2} loop muted />

---

Audio

Install: npx remotion add @remotion/media

import { Audio } from "@remotion/media";

<Audio src={staticFile("audio.mp3")} />
<Audio src={staticFile("audio.mp3")} trimBefore={2 * fps} trimAfter={10 * fps} />
<Sequence from={1 * fps}><Audio src={staticFile("audio.mp3")} /></Sequence>  // delay
// volume callback: `f` starts at 0 when audio begins, not composition frame
<Audio src={staticFile("audio.mp3")} volume={(f) => interpolate(f, [0, fps], [0, 1], { extrapolateRight: "clamp" })} />

---

GIFs & Animated Images

import { AnimatedImage, staticFile } from "remotion";

// Preferred: supports GIF, APNG, AVIF, WebP
<AnimatedImage src={staticFile("animation.gif")} width={500} height={500} />
<AnimatedImage src={staticFile("animation.gif")} width={500} height={300} fit="cover" playbackRate={2} />

// Fallback: GIF only — npx remotion add @remotion/gif
import { Gif } from "@remotion/gif";
<Gif src={staticFile("animation.gif")} width={500} height={500} />

---

Fonts

Google Fonts (recommended): npx remotion add @remotion/google-fonts

import { loadFont } from '@remotion/google-fonts/Roboto';

const { fontFamily } = loadFont('normal', { weights: ['400', '700'], subsets: ['latin'] });
<h1 style={{ fontFamily, fontSize: 80, fontWeight: 'bold' }}>{text}</h1>;

Local fonts: npx remotion add @remotion/fonts

import { loadFont } from '@remotion/fonts';
import { staticFile } from 'remotion';

await Promise.all([
    loadFont({ family: 'Inter', url: staticFile('Inter-Regular.woff2'), weight: '400' }),
    loadFont({ family: 'Inter', url: staticFile('Inter-Bold.woff2'), weight: '700' })
]);

---

Transitions (Full API)

npx remotion add @remotion/transitions

import { TransitionSeries, linearTiming, springTiming } from "@remotion/transitions";
import { fade } from "@remotion/transitions/fade";
import { slide } from "@remotion/transitions/slide";
import { wipe } from "@remotion/transitions/wipe";
import { flip } from "@remotion/transitions/flip";

<TransitionSeries>
  <TransitionSeries.Sequence durationInFrames={60}><SceneA /></TransitionSeries.Sequence>
  <TransitionSeries.Transition presentation={fade()} timing={linearTiming({ durationInFrames: 15 })} />
  <TransitionSeries.Sequence durationInFrames={60}><SceneB /></TransitionSeries.Sequence>
</TransitionSeries>

// Slide directions: "from-left" | "from-right" | "from-top" | "from-bottom"
<TransitionSeries.Transition presentation={slide({ direction: "from-left" })} timing={linearTiming({ durationInFrames: 20 })} />

// Spring timing
springTiming({ config: { damping: 200 }, durationInFrames: 25 })

// Overlay (no duration shortening — note: cannot be adjacent to transition or another overlay)
<TransitionSeries.Overlay durationInFrames={20} offset={0}><MyEffect /></TransitionSeries.Overlay>

Duration: two 60-frame scenes + 15-frame transition = 60 + 60 - 15 = 105 frames total.

---

Light Leaks (Overlay Effect)

Requires Remotion ≥ 4.0.415. Check: npx remotion versions. Upgrade: npx remotion upgrade.

npx remotion add @remotion/light-leaks

import { LightLeak } from "@remotion/light-leaks";

// As TransitionSeries overlay
<TransitionSeries.Overlay durationInFrames={30}><LightLeak /></TransitionSeries.Overlay>

// Standalone decorative overlay
<AbsoluteFill>
  <MyContent />
  <LightLeak durationInFrames={60} seed={3} />
</AbsoluteFill>

// seed: different patterns; hueShift: 0=yellow-orange, 120=green, 240=blue
<LightLeak seed={5} hueShift={240} />

---

3D with Three.js (React Three Fiber)

npx remotion add @remotion/three

MUST wrap in <ThreeCanvas> with width and height props. FORBIDDEN: useFrame() from @react-three/fiber — causes flickering. Use useCurrentFrame().

import { ThreeCanvas } from '@remotion/three';
import { useVideoConfig, useCurrentFrame } from 'remotion';

const { width, height } = useVideoConfig();
const frame = useCurrentFrame();

<ThreeCanvas width={width} height={height}>
    <ambientLight intensity={0.4} />
    <directionalLight position={[5, 5, 5]} intensity={0.8} />
    <mesh rotation={[0, frame * 0.02, 0]}>
        <boxGeometry args={[2, 2, 2]} />
        <meshStandardMaterial color="#4a9eff" />
    </mesh>
</ThreeCanvas>;

// <Sequence> inside ThreeCanvas must use layout="none"

---

Text Animations

All text animations driven by useCurrentFrame(). CSS transitions FORBIDDEN.

Typewriter — use string slicing, NEVER per-character opacity. Spring word highlight — scaleX wipe from left.

Implementing typewriter or word-highlight? Copy from refs/text-animations.tsx — do NOT implement from memory. Contains: getTypedText, Cursor, TypewriterScene, Highlight.

---

Text Measurement

npx remotion add @remotion/layout-utils

import { measureText, fitText, fillTextBox } from '@remotion/layout-utils';

const { width, height } = measureText({ text: 'Hello World', fontFamily: 'Arial', fontSize: 32, fontWeight: 'bold' });
const { fontSize } = fitText({ text: 'Hello World', withinWidth: 600, fontFamily: 'Inter', fontWeight: 'bold' });

MUST ATTENTION call only after fonts loaded. Use validateFontIsLoaded: true. Match font properties exactly between measurement and rendering.

---

DOM Node Measurement

Remotion applies scale() transform — use useCurrentScale() to get true dimensions:

import { useCurrentScale } from 'remotion';

const scale = useCurrentScale();
const rect = ref.current.getBoundingClientRect();
const trueWidth = rect.width / scale;

---

Captions & Subtitles

npx remotion add @remotion/captions

Caption type: { text, startMs, endMs, timestampMs, confidence }

Transcribe with Whisper.cpp: npx remotion add @remotion/install-whisper-cpp

import { installWhisperCpp, downloadWhisperModel, transcribe, toCaptions } from '@remotion/install-whisper-cpp';

await installWhisperCpp({ to: './whisper.cpp', version: '1.5.5' });
await downloadWhisperModel({ model: 'medium.en', folder: './whisper.cpp' });
// Convert to 16KHz wav first: npx remotion ffmpeg -i input.mp4 -ar 16000 output.wav
const whisperOutput = await transcribe({
    model: 'medium.en',
    whisperPath: './whisper.cpp',
    whisperCppVersion: '1.5.5',
    inputPath: '/path/to/audio.wav',
    tokenLevelTimestamps: true
});
const { captions } = toCaptions({ whisperCppOutput: whisperOutput });

Import from.srt:

import { parseSrt } from '@remotion/captions';
const { captions } = parseSrt({ input: await fetch(staticFile('subtitles.srt')).then(r => r.text()) });

TikTok-style word highlight display:

Implementing TikTok-style captions? Copy from refs/captions.tsx — do NOT implement from memory. Contains: CaptionedVideo, CaptionPage, delayRender, createTikTokStyleCaptions, per-token active highlighting.

Note: use whiteSpace: "pre" — captions are whitespace-sensitive.

---

Dynamic Compositions — calculateMetadata

import { CalculateMetadataFunction } from 'remotion';

const calculateMetadata: CalculateMetadataFunction<Props> = async ({ props, abortSignal }) => {
    const durationInSeconds = await getVideoDuration(props.videoSrc);
    return { durationInFrames: Math.ceil(durationInSeconds * 30) };
};

// Transform props (fetch data before render)
const calculateMetadata: CalculateMetadataFunction<Props> = async ({ props, abortSignal }) => {
    const data = await fetch(props.dataUrl, { signal: abortSignal }).then(r => r.json());
    return { props: { ...props, fetchedData: data } };
};

// Return values (all optional): durationInFrames, width, height, fps, props, defaultOutName, defaultCodec

---

Parameters — Zod Schema

import { z } from 'zod';
import { zColor } from '@remotion/zod-types';

export const MyCompositionSchema = z.object({
    title: z.string(),
    color: zColor() // renders color picker in Studio
});

// Root.tsx
<Composition
    id="MyComposition"
    component={MyComponent}
    schema={MyCompositionSchema}
    durationInFrames={100}
    fps={30}
    width={1080}
    height={1080}
    defaultProps={{ title: 'Hello World', color: '#ff0000' }}
/>;

Top-level type MUST be z.object().

---

Mediabunny — Video/Audio Metadata

npx remotion add mediabunny

Need video/audio duration, dimensions, or frame extraction? Copy from refs/mediabunny-utils.ts — do NOT implement from memory. Contains: getVideoDuration, getAudioDuration, getVideoDimensions, canDecode, extractFrames.

Use staticFile() for local files. Use FileSource instead of UrlSource in Node.js/Bun.

---

FFmpeg in Remotion

npx remotion ffmpeg -i input.mp4 output.mp3
npx remotion ffprobe input.mp4

Trimming — prefer <Video> props (non-destructive, no re-encoding):

<Video src={staticFile('video.mp4')} trimBefore={5 * fps} trimAfter={10 * fps} />

// FFmpeg fallback (MUST re-encode to avoid frozen frames)
// npx remotion ffmpeg -ss 00:00:05 -i public/input.mp4 -to 00:00:10 -c:v libx264 -c:a aac public/output.mp4

---

Silence Detection

# Step 1: measure loudness
npx remotion ffmpeg -i public/video.mov -map 0:a -af loudnorm=print_format=json -f null /dev/null
# → read input_i (integrated loudness dB) and input_thresh

# Step 2: detect silences (d=0.5 = min silence duration in seconds)
npx remotion ffmpeg -i public/video.mov -map 0:a -af "silencedetect=noise=${THRESH}dB:d=0.5" -f null /dev/null

<Video src={staticFile('video.mov')} trimBefore={Math.floor(leadingEnd * fps)} trimAfter={Math.ceil(trailingStart * fps)} />

---

Audio Visualization

npx remotion add @remotion/media-utils

import { useWindowedAudioData, visualizeAudio, visualizeAudioWaveform, createSmoothSvgPath } from '@remotion/media-utils';

const { audioData, dataOffsetInSeconds } = useWindowedAudioData({ src: staticFile('music.mp3'), frame, fps, windowInSeconds: 30 });
if (!audioData) return null;

// Spectrum bars (numberOfSamples must be power of 2)
const frequencies = visualizeAudio({ fps, frame, audioData, numberOfSamples: 256, optimizeFor: 'speed', dataOffsetInSeconds });
// Values 0-1; left=bass, right=highs

// Waveform SVG
const waveform = visualizeAudioWaveform({ fps, frame, audioData, numberOfSamples: 256, windowInSeconds: 0.5, dataOffsetInSeconds });
const path = createSmoothSvgPath({ points: waveform.map((y, i) => ({ x: (i / (waveform.length - 1)) * width, y: 100 + y * 100 })) });

// Bass-reactive scale
const bassIntensity = frequencies.slice(0, 32).reduce((sum, v) => sum + v, 0) / 32;
const scale = 1 + bassIntensity * 0.5;

MUST ATTENTION pass frame from parent to child visualization — NEVER call useCurrentFrame() in each child inside <Sequence>.

Logarithmic scaling: const db = 20 * Math.log10(value); const scaled = (db - (-100)) / ((-30) - (-100));

---

Lottie Animations

npx remotion add @remotion/lottie

import { Lottie, LottieAnimationData } from '@remotion/lottie';
import { cancelRender, continueRender, delayRender } from 'remotion';

export const MyAnimation = () => {
    const [handle] = useState(() => delayRender('Loading Lottie animation'));
    const [animationData, setAnimationData] = useState<LottieAnimationData | null>(null);

    useEffect(() => {
        fetch('https://assets4.lottiefiles.com/packages/lf20_zyquagfl.json')
            .then(r => r.json())
            .then(json => {
                setAnimationData(json);
                continueRender(handle);
            })
            .catch(err => {
                cancelRender(err);
            });
    }, [handle]);

    if (!animationData) return null;
    return <Lottie animationData={animationData} style={{ width: 400, height: 400 }} />;
};

---

Charts & Data Visualization

MUST ATTENTION drive all animations from useCurrentFrame(). Disable all third-party chart library animations.

import { spring, evolvePath, getLength, getPointAtLength, getTangentAtLength } from '@remotion/paths';

// Bar chart — spring stagger
const bars = data.map((item, i) => {
    const height = spring({ frame, fps, delay: i * 5, config: { damping: 200 } });
    return <div style={{ height: height * item.value }} />;
});

// Line chart path animation (npx remotion add @remotion/paths)
const pathProgress = interpolate(frame, [0, 2 * fps], [0, 1], { extrapolateLeft: 'clamp', extrapolateRight: 'clamp' });
const { strokeDasharray, strokeDashoffset } = evolvePath(pathProgress, svgPath);
<path d={svgPath} fill="none" stroke="#FF3232" strokeWidth={4} strokeDasharray={strokeDasharray} strokeDashoffset={strokeDashoffset} />;

---

Maps with Mapbox

npm i mapbox-gl @turf/turf @types/mapbox-gl — set REMOTION_MAPBOX_TOKEN in .env.

Implementing Mapbox map scene? Copy from refs/maps-mapbox.tsx — do NOT implement from memory. Key rules: interactive: false, fadeDuration: 0, explicit width/height/position: "absolute" on container, animate camera via useCurrentFrame(), NO cleanup (_map.remove()). Render: npx remotion render --gl=angle --concurrency=1.

---

Transparent Video Rendering

# ProRes (for video editors)
npx remotion render --image-format=png --pixel-format=yuva444p10le --codec=prores --prores-profile=4444 MyComp out.mov

# WebM VP9 (for browsers)
npx remotion render --image-format=png --pixel-format=yuva420p --codec=vp9 MyComp out.webm

---

AI Voiceover (ElevenLabs TTS)

Implementing ElevenLabs TTS voiceover? Copy from refs/generate-voiceover.ts — do NOT implement from memory. Includes calculateMetadata integration to size composition to audio duration.

---

Sound Effects

import { Audio } from '@remotion/sfx';
<Audio src={'https:/$remotion.media/whoosh.wav'} />;

Available: whoosh, whip, page-turn, switch, mouse-click, shutter-modern, shutter-old, ding, bruh, vine-boom, windows-xp-error — all at https:/$remotion.media/{name}.wav

---

TailwindCSS

Use if installed. NEVER use transition-* or animate-* Tailwind classes — animate via useCurrentFrame().

---

Closing Reminders

• MUST ATTENTION wait for user approval of scene plan (Step 3.3) — NEVER implement scenes before approval
• MUST ATTENTION read existing project structure (Step 3.4) before modifications — NEVER overwrite blindly
• MUST ATTENTION update totalChapters in ALL scene files when adding/removing scenes — one missed file causes visual regression
• MUST ATTENTION keep data arrays outside component body — NEVER define const ITEMS inside component function
• MUST ATTENTION use npx create-video@latest --yes --blank --no-tailwind for scaffold — NEVER npm init unless fallback needed
• MUST ATTENTION use staggeredEaseOut for list/card reveals — NEVER all-at-once opacity
• MUST ATTENTION verify PROJECT_EXISTS before Play mode — report missing project and exit
• MUST ATTENTION use task tracking to plan ALL work before starting — mark each task done immediately
• MUST ATTENTION ALL animations driven by useCurrentFrame() — CSS transitions, CSS animations, Tailwind animate/transition classes FORBIDDEN
• MUST ATTENTION use Remotion components <Img>, <Video>, <Audio> — NEVER native HTML elements
• MUST ATTENTION use staticFile() for all public/ folder assets — NEVER raw relative paths
• MUST ATTENTION Copy from appropriate refs/ file — NEVER implement text animations, captions, mediabunny, maps, or voiceover from memory

Hookless Prompt Protocol Mirror (Auto-Synced)

Source: .claude/hooks/lib/prompt-injections.cjs + .claude/.ck.json

[WORKFLOW-EXECUTION-PROTOCOL] [BLOCKING] Workflow Execution Protocol — MANDATORY IMPORTANT MUST CRITICAL. Do not skip for any reason.

1. DETECT: Match prompt against workflow catalog
2. ANALYZE: Find best-match workflow AND evaluate if a custom step combination would fit better
3. ASK (REQUIRED FORMAT): Use a direct user question with this structure:
   • Question: "Which workflow do you want to activate?"
   • Option 1: "Activate [BestMatch Workflow] (Recommended)"
   • Option 2: "Activate custom workflow: [step1 → step2 → ...]" (include one-line rationale)
4. ACTIVATE (if confirmed): Call $workflow-start <workflowId> for standard; sequence custom steps manually
5. CREATE TASKS: task tracking for ALL workflow steps
6. EXECUTE: Follow each step in sequence [CRITICAL-THINKING-MINDSET] Apply critical thinking, sequential thinking. Every claim needs traced proof, confidence >80% to act. Anti-hallucination principle: Never present guess as fact — cite sources for every claim, admit uncertainty freely, self-check output for errors, cross-reference independently, stay skeptical of own confidence — certainty without evidence root of all hallucination. AI Attention principle (Primacy-Recency): Put the 3 most critical rules at both top and bottom of long prompts/protocols so instruction adherence survives long context windows.

Learned Lessons

Lessons Learned

[CRITICAL] Hard-won project debugging/architecture rules. MUST ATTENTION apply BEFORE forming hypothesis or writing code.

Quick Summary

Goal: Prevent recurrence of known failure patterns — debugging, architecture, naming, AI orchestration, environment.

Top Rules (apply always):

• MUST ATTENTION verify ALL preconditions (config, env, DB names, DI regs) BEFORE code-layer hypothesis
• MUST ATTENTION fix responsible layer — NEVER patch symptom sites with caller-specific defensive code
• MUST ATTENTION use ExecuteInjectScopedAsync for parallel async + repo/UoW — NEVER ExecuteUowTask
• MUST ATTENTION name by PURPOSE not CONTENT — adding member forces rename = abstraction broken
• MUST ATTENTION persist sub-agent findings incrementally after each file — NEVER batch at end
• MUST ATTENTION Windows bash: verify Python alias (where python/where py) — NEVER assume python/python3 resolves

---

Debugging & Root Cause Reasoning

• [2026-04-11] Holistic-first: verify environment before code. Failure → list ALL preconditions (config, env vars, DB names, endpoints, DI regs, credentials, permissions, data prerequisites) → verify each via evidence (grep/cat/query) BEFORE code-layer hypothesis. Worst rabbit holes: diving nearest layer while bug sits elsewhere — e.g., hours debugging "sync timeout", real cause: test appsettings pointing wrong DB. Cheapest check first.
• [2026-04-01] Ask "whose responsibility?" before fixing. Trace: bug in caller (wrong data) or callee (wrong handling)? Fix responsible layer — NEVER patch symptom site masking real issue.
• [2026-04-01] Trace data lifecycle, not error site. Follow data: creation → transformation → consumption. Bug usually where data created wrong, not consumed.
• [2026-04-01] Code is caller-agnostic. Functions/handlers/consumers don't know who invokes them. Comments/guards/messages describe business intent — NEVER reference specific callers (tests, seeders, scripts).

Architecture Invariants

• [2026-03-31] ParallelAsync + repo/UoW MUST use ExecuteInjectScopedAsync, NEVER ExecuteUowTask. ExecuteUowTask creates new UoW but reuses outer DI scope (same DbContext) — parallel iterations sharing non-thread-safe DbContext silently corrupt data. ExecuteInjectScopedAsync creates new UoW + new DI scope (fresh repo per iteration).
• [2026-03-31] Bus message naming MUST include service name prefix — core services NEVER consume feature events. Prefix declares schema ownership (AccountUserEntityEventBusMessage = Accounts owns). Core services (Accounts, Communication) are leaders. Feature services (Growth, Talents) sending to core MUST use {CoreServiceName}...RequestBusMessage — never define own event for core to consume.

Naming & Abstraction

• [2026-04-12] Name PURPOSE not CONTENT — "OrXxx" anti-pattern. HrManagerOrHrOrPayrollHrOperationsPolicy names set members, not what it guards. Add role → rename = broken abstraction. Rule: names express DOES/GUARDS, not CONTAINS. Test: adding/removing member forces rename? YES = content-driven = bad → rename to purpose (e.g., HrOperationsAccessPolicy). Nuance: "Or" fine in behavioral idioms (FirstOrDefault, SuccessOrThrow) — expresses HAPPENS, not membership.

Environment & Tooling

• [2026-04-20] Windows bash: NEVER assume python/python3 resolves — verify alias first. Python may not be in bash PATH under those names. Check: where python / where py. Prefer py (Windows Python Launcher) for one-liners, node if JS alternative exists.

Test-specific lessons → docs/project-reference/integration-test-reference.md Lessons Learned section. Production-code anti-patterns → docs/project-reference/backend-patterns-reference.md Anti-Patterns section. Generic debugging/refactoring reminders → System Lessons in .claude/hooks/lib/prompt-injections.cjs.

---

Closing Reminders

• IMPORTANT MUST ATTENTION holistic-first: verify ALL preconditions (config, env, DB names, endpoints, DI regs) BEFORE code-layer hypothesis — cheapest check first
• IMPORTANT MUST ATTENTION fix responsible layer — NEVER patch symptom site; trace caller (wrong data) vs callee (wrong handling), fix root owner
• IMPORTANT MUST ATTENTION parallel async + repo/UoW → ALWAYS ExecuteInjectScopedAsync, NEVER ExecuteUowTask (shared DbContext = silent data corruption)
• IMPORTANT MUST ATTENTION bus message prefix = schema ownership; feature services NEVER define events for core services — use {CoreServiceName}...RequestBusMessage
• IMPORTANT MUST ATTENTION name by PURPOSE — adding/removing member forces rename = broken abstraction
• IMPORTANT MUST ATTENTION sub-agents MUST write findings after each file/section — NEVER batch all findings into one final write
• IMPORTANT MUST ATTENTION Windows bash: NEVER assume python/python3 resolves — run where python/where py first, use py launcher or node

[LESSON-LEARNED-REMINDER] [BLOCKING] Task Planning & Continuous Improvement — MANDATORY. Do not skip.

Break work into small tasks (task tracking) before starting. Add final task: "Analyze AI mistakes & lessons learned".

Extract lessons — ROOT CAUSE ONLY, not symptom fixes:

1. Name the FAILURE MODE (reasoning/assumption failure), not symptom — "assumed API existed without reading source" not "used wrong enum value".
2. Generality test: does this failure mode apply to ≥3 contexts/codebases? If not, abstract one level up.
3. Write as a universal rule — strip project-specific names/paths/classes. Useful on any codebase.
4. Consolidate: multiple mistakes sharing one failure mode → ONE lesson.
5. Recurrence gate: "Would this recur in future session WITHOUT this reminder?" — No → skip $learn.
6. Auto-fix gate: "Could $code-review/$code-simplifier/$security/$lint catch this?" — Yes → improve review skill instead.
7. BOTH gates pass → ask user to run $learn. [TASK-PLANNING] [MANDATORY] BEFORE executing any workflow or skill step, create/update task tracking for all planned steps, then keep it synchronized as each step starts/completes.