framevideo

AI Production Route

When the user asks to go from an idea, script, plot, storyboard, reference image, or rough video concept to a generated video, invoke framevideo-ai-production as the front half of the workflow. That skill turns creative material into Clip, Shot, and Chanjing AIGC plans.

For real Chanjing AI image/video generation:

1. Use framevideo-ai-production to produce Shot-level Chanjing AIGC plans.
2. Use chanjing-digital-human/references/ai-creation.md for Chanjing AI Creation model discovery, idempotent submission, short sync polling, download, and local asset paths.
3. Only compose with local assets under assets/ai-creation/images/ or assets/ai-creation/videos/.
4. Return here to build the FrameVideo HTML composition, audio, captions, transitions, QA, preview, and render.

Do not directly insert remote Chanjing output URLs into composition HTML.

Approach

Discovery (exploratory requests only)

For open-ended requests ("make me a product launch video", "create something for our brand") where the user hasn't committed to a direction, understand intent before picking colors:

• Audience — who watches this? Developers? Executives? General consumers?
• Platform — where does it play? Social (15s), website hero, product demo, internal?
• Priority — what matters most? Motion quality? Content accuracy? Brand fidelity? Speed?
• Variations — does the user want options, or a single best shot?

For specific requests ("add a title card", "fix the timing on scene 3"), skip discovery.

For exploratory requests, consider offering 2-3 variations that differ meaningfully — not just color swaps, but different pacing, energy levels, or structural approaches. One safe/expected, one ambitious. Don't mandate this — it's a tool available when appropriate.

Step 1: Design system

If a design spec exists in the project, read it first. Look in precedence order: frame.md → design.md → DESIGN.md (design.md and DESIGN.md are different files on Linux — check both casings; frame.md is always lowercase, no FRAME.md variant). frame.md is the preferred spec for video/framevideo projects and wins if more than one exists; it uses the same format as design.md. It's the source of truth for brand colors, fonts, and constraints. Use its exact values — don't invent colors or substitute fonts. Any format works (YAML frontmatter, prose, tables — just extract the values).

If it names fonts you can't find locally (no fonts/ directory with .woff2 files, not a built-in font), warn the user before writing HTML: "the spec specifies [font name] but no font files found. Please add .woff2 files to fonts/ or I'll fall back to [closest built-in alternative]."

If no frame.md or design.md exists, offer the user a choice:

1. User named a style or mood? → Read visual-styles.md for the 8 named presets. Pick the closest match.
2. Want to browse options visually? → Run the design picker: read references/design-picker.md for the full workflow. This serves a visual picker page. The user configures mood, palette, typography, and motion in the browser, then copies the generated design.md and pastes it back into the conversation.
3. Want to skip and go fast? → Ask: mood, light or dark, any brand colors/fonts? Then pick a palette from house-style.md.

The design spec defines the brand. It does not define video composition rules. Those come from references/video-composition.md and house-style.md. Use brand colors at video-appropriate scale — not at web-UI opacity.

Step 2: Prompt expansion

Always run on every composition (except single-scene pieces and trivial edits). This step grounds the user's intent against the design spec (frame.md or design.md) and house-style.md and produces a consistent intermediate that every downstream agent reads the same way.

Read references/prompt-expansion.md for the full process and output format.

Step 3: Plan

Before writing HTML, think at a high level:

1. What — what should the viewer experience? Identify the narrative arc, key moments, and emotional beats.
2. Structure — how many compositions, which are sub-compositions vs inline, what tracks carry what (video, audio, overlays, captions).
3. Rhythm — declare your scene rhythm before implementing. Which scenes are quick hits, which are holds, where do shaders land, where does energy peak. Name the pattern: fast-fast-SLOW-fast-SHADER-hold. Read references/beat-direction.md for rhythm templates.
4. Timing — which clips drive the duration, where do transitions land, what's the pacing.
5. Layout — build the end-state first. See "Layout Before Animation" below.
6. Animate — then add motion using the rules below.

Build what was asked. A request for "a title card" is not a request for "a title card + 3 supporting scenes + ambient music + captions." Every scene, every element, every tween should earn its place. If additional scenes or elements would genuinely improve the piece, propose them — don't add them.

For small edits (fix a color, adjust timing, add one element), skip straight to the rules.

Visual QA Skill

Use the framevideo-visual-qa skill when creating a new composition, making substantial layout/caption/asset/layering changes, fixing visual issues, or before declaring a composition visually ready. That skill owns reusable video QA rules for safe areas, text/background contrast, text overflow, unintentional overlap, and motion collisions. Keep project-specific brand identity in frame.md, design.md, or DESIGN.md; keep general visual QA method in the skill.

/* Step 1-2: Build the readable end state */
.scene-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 100%;
  height: 100%;
  padding: 120px 160px;
  gap: 24px;
  box-sizing: border-box;
}
.title { font-size: 120px; }
.subtitle { font-size: 42px; }

// Step 3: Animate INTO those positions
tl.from(".title", { y: 60, opacity: 0, duration: 0.6, ease: "power3.out" }, 0);
tl.from(".subtitle", { y: 40, opacity: 0, duration: 0.5, ease: "power3.out" }, 0.2);

// Step 4: Animate OUT from those positions
tl.to(".title", { y: -40, opacity: 0, duration: 0.4, ease: "power2.in" }, 3);

.scene-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  padding: 120px 160px; /* Safe area */
  gap: 24px;
  box-sizing: border-box;
}

/* WRONG - breaks on long text */
.scene-content {
  position: absolute;
  top: 200px;
  left: 160px;
  width: 1920px;
  height: 1080px;
}

.headline {
  max-width: 1200px; /* Wraps at this width */
  font-size: 96px;
  line-height: 1.1;
}

const { title } = window.__framevideo.getVariables();
const fontSize = window.__framevideo.fitTextFontSize(title, {
  maxWidth: 1200,
  fontFamily: 'Inter',
  fontWeight: 700
});
document.getElementById('title').style.fontSize = fontSize + 'px';

<div class="scene-content">
  <h1>Main Message</h1>
  <p class="subtitle">Supporting detail</p>
</div>

<style>
  .scene-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    width: 100%;
    height: 100%;
    padding: 120px 160px;
    gap: 32px;
    box-sizing: border-box;
  }
</style>

<div class="scene-content">
  <div class="text-side">
    <h2>Product Feature</h2>
    <p>Explanation</p>
  </div>
  <div class="visual-side">
    <img src="assets/product.png" />
  </div>
</div>

<style>
  .scene-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    width: 100%;
    height: 100%;
    padding: 120px 160px;
    box-sizing: border-box;
  }
</style>

// ❌ Wrong
tl.from(".title", { opacity: 0 }, 0);

// ✅ Right
tl.from(".title", { opacity: 0 }, 0.2); // 0.1-0.3s offset

tl.from("#el1", { opacity: 0, ease: "power3.out" }, 0.2);
tl.from("#el2", { opacity: 0, ease: "expo.out" }, 0.4);
tl.from("#el3", { opacity: 0, ease: "back.out(1.4)" }, 0.6);

// ❌ Wrong - everything from top
tl.from("#title", { y: 60, opacity: 0 }, 0.2);
tl.from("#subtitle", { y: 60, opacity: 0 }, 0.5);

// ✅ Right - varied directions
tl.from("#title", { y: 60, opacity: 0 }, 0.2);
tl.from("#subtitle", { x: -30, opacity: 0 }, 0.5);
tl.from("#cta", { scale: 0.8, opacity: 0 }, 0.8);

// Stagger by time
tl.from(".item", { 
  y: 30, 
  opacity: 0, 
  duration: 0.5,
  stagger: 0.1,
  ease: "power2.out"
}, 0.5);

// Stagger from center
tl.from(".grid-item", {
  scale: 0.8,
  opacity: 0,
  duration: 0.4,
  stagger: { amount: 0.6, from: "center" },
  ease: "back.out(1.4)"
}, 1.0);

// Sequence - one after another
tl.from("#el1", { opacity: 0, duration: 0.5 }, 0);
tl.from("#el2", { opacity: 0, duration: 0.5 }, ">"); // After previous ends

// Overlap - start before previous ends
tl.from("#el1", { opacity: 0, duration: 0.8 }, 0);
tl.from("#el2", { opacity: 0, duration: 0.5 }, "<0.4"); // 0.4s after el1 starts

tl.addLabel("intro", 0);
tl.from("#title", { opacity: 0 }, "intro");
tl.from("#subtitle", { opacity: 0 }, "intro+=0.5");

tl.addLabel("content", 2.5);
tl.from("#feature1", { x: -40, opacity: 0 }, "content");

// ❌ Wrong - both animate opacity
timeline1.to("#el", { opacity: 0.5 });
timeline2.to("#el", { opacity: 1 }); // Conflict!

// ✅ Right - separate properties
timeline1.to("#el", { opacity: 0.5 });
timeline2.to("#el", { x: 100 }); // No conflict

Scene Transitions (Non-Negotiable)

Every multi-scene composition MUST follow these 4 rules:

Rule 1: Always Use Transitions

No jump cuts between scenes. Every scene change needs a transition.

Rule 2: Always Use Entrance Animations

Every element in every scene animates IN via gsap.from(). No element may appear fully-formed.

Rule 3: Never Use Exit Animations (Except Final Scene)

Do NOT animate elements out before a transition. The transition IS the exit. The outgoing scene's content MUST be fully visible when the transition starts.

Rule 4: Final Scene Only

The last scene is the ONLY scene where gsap.to(..., { opacity: 0 }) or exit animations are allowed.

Example:

// Scene 1 (0-7s)
// ✅ Entrance animations only
tl.from("#s1-title", { y: 50, opacity: 0, duration: 0.7, ease: "power3.out" }, 0.3);
tl.from("#s1-subtitle", { y: 30, opacity: 0, duration: 0.5, ease: "power2.out" }, 0.6);
// ❌ NO exit animations - transition handles it

// Transition at 7s (see references/transitions.md)

// Scene 2 (8-15s)
// ✅ Entrance animations
tl.from("#s2-heading", { x: -40, opacity: 0, duration: 0.6, ease: "expo.out" }, 8.0);

// Final scene (15-20s)
// ✅ OK to fade out on final scene only
tl.from("#s3-cta", { scale: 0.9, opacity: 0, duration: 0.5 }, 15.2);
tl.to("#s3-cta", { opacity: 0, duration: 0.5, ease: "power2.in" }, 19.5);

See references/transitions.md for transition implementation.

Layout Before Animation

.scene-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 100%;
  height: 100%;
  padding: 120px 160px;
  gap: 24px;
  box-sizing: border-box;
}
.title {
  font-size: 120px;
}
.subtitle {
  font-size: 42px;
}
/* Container fills any scene size (1920x1080, 1080x1920, etc).
   Padding positions content. Flex + gap handles spacing. */

WRONG — hardcoded dimensions and absolute positioning:

.scene-content {
  position: absolute;
  top: 200px;
  left: 160px;
  width: 1920px;
  height: 1080px;
  display: flex; /* ... */
}

// Step 3: Animate INTO those positions
tl.from(".title", { y: 60, opacity: 0, duration: 0.6, ease: "power3.out" }, 0);
tl.from(".subtitle", { y: 40, opacity: 0, duration: 0.5, ease: "power3.out" }, 0.2);
tl.from(".logo", { scale: 0.8, opacity: 0, duration: 0.4, ease: "power2.out" }, 0.3);

// Step 4: Animate OUT from those positions
tl.to(".title", { y: -40, opacity: 0, duration: 0.4, ease: "power2.in" }, 3);
tl.to(".subtitle", { y: -30, opacity: 0, duration: 0.3, ease: "power2.in" }, 3.1);
tl.to(".logo", { scale: 0.9, opacity: 0, duration: 0.3, ease: "power2.in" }, 3.2);

When elements share space across time

If element A exits before element B enters in the same area, both should have correct CSS positions for their respective hero frames. The timeline ordering guarantees they never visually coexist — but if you skip the layout step, you won't catch the case where they accidentally overlap due to a timing error.

What counts as intentional overlap

Layered effects (glow behind text, shadow elements, background patterns) and z-stacked designs (card stacks, depth layers) are intentional. The layout step is about catching unintentional overlap — two headlines landing on top of each other, a stat covering a label, content bleeding off-frame.

Data Attributes

All Clips

data-track-index does not affect visual layering — use CSS z-index.

Composition Clips

On the root <html> element:

Composition Structure

Sub-compositions loaded via data-composition-src use a <template> wrapper. Standalone compositions (the main index.html) do NOT use <template> — they put the data-composition-id div directly in <body>. Using <template> on a standalone file hides all content from the browser and breaks rendering.

Sub-composition structure:

<template id="my-comp-template">
  <div data-composition-id="my-comp" data-width="1920" data-height="1080">
    <!-- content -->
    <style>
      [data-composition-id="my-comp"] {
        /* scoped styles */
      }
    </style>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/gsap.min.js"></script>
    <script>
      window.__timelines = window.__timelines || {};
      const tl = gsap.timeline({ paused: true });
      // tweens...
      window.__timelines["my-comp"] = tl;
    </script>
  </div>
</template>

Load in root: <div id="el-1" data-composition-id="my-comp" data-composition-src="compositions/my-comp.html" data-start="0" data-duration="10" data-track-index="1"></div>

Variables (Parametrized Compositions)

Render the same composition with different content — title, theme color, prices, captions — without editing the source HTML.

Three-step pattern:

1. Declare variables on the composition's <html> root with data-composition-variables. Each entry needs id, type (one of string, number, color, boolean, enum), label, and default. Enum entries also need options: [{value, label}, ...].
2. Read the resolved values inside the composition's script with window.__framevideo.getVariables(). Returns the merged result of declared defaults + per-instance overrides + CLI overrides.
3. Override at render time with npx framevideo render --variables '{...}' (top-level) or with data-variable-values='{...}' on the host element (per-instance for sub-comps).

<!doctype html>
<html
  data-composition-variables='[
  {"id":"title","type":"string","label":"Title","default":"Hello"},
  {"id":"theme","type":"enum","label":"Theme","default":"light","options":[
    {"value":"light","label":"Light"},
    {"value":"dark","label":"Dark"}
  ]}
]'
>
  <body>
    <div data-composition-id="root" data-width="1920" data-height="1080">
      <h1 id="hero" class="clip" data-start="0" data-duration="3"></h1>
      <script>
        const { title, theme } = window.__framevideo.getVariables();
        document.getElementById("hero").textContent = title;
        document.body.dataset.theme = theme;
      </script>
    </div>
  </body>
</html>

# Dev preview uses declared defaults
npx framevideo preview

# Render with overrides
npx framevideo render --variables '{"title":"Q4 Report","theme":"dark"}' --output q4.mp4

# Or from a JSON file
npx framevideo render --variables-file ./vars.json

Sub-composition per-instance values: the same getVariables() works inside sub-comps loaded via data-composition-src. Each host element passes its own values:

<div
  data-composition-id="card-pro"
  data-composition-src="compositions/card.html"
  data-variable-values='{"title":"Pro","price":"$29"}'
></div>
<div
  data-composition-id="card-enterprise"
  data-composition-src="compositions/card.html"
  data-variable-values='{"title":"Enterprise","price":"Custom"}'
></div>

The runtime layers each host's data-variable-values over the sub-comp's declared defaults on a per-instance basis, so the same source can be embedded multiple times with different content.

Rules of thumb:

• Always provide a sensible default for every declared variable. Dev preview uses defaults — without them, the composition won't render correctly until --variables is provided.
• Read variables once at the top of the script (const { title } = ...), not inside frame loops or event handlers — getVariables() allocates a fresh object per call.
• Use --strict-variables in CI to fail fast on undeclared keys or type mismatches.
• Variable types are validated at render time. string, number, boolean, and color (hex string) check typeof; enum checks the value is in the declared options.

Video and Audio

Video must be muted playsinline. Audio is always a separate <audio> element:

<video
  id="el-v"
  data-start="0"
  data-duration="30"
  data-track-index="0"
  src="video.mp4"
  muted
  playsinline
></video>
<audio
  id="el-a"
  data-start="0"
  data-duration="30"
  data-track-index="2"
  src="video.mp4"
  data-volume="1"
></audio>

For background music from the Chanjing platform, use the CLI to download a local asset first:

npx framevideo chanjing music list --compact
npx framevideo chanjing music download --id <music-id> --chorus --duration 10 --json

Use the returned htmlSnippet or author the same shape manually. Keep BGM local under assets/music/; do not reference remote Chanjing/OSS URLs directly in composition HTML. Suggested BGM volume is 0.10-0.22; use data-volume="0.12" when speech or digital-human narration is present.

For sound effects from the Chanjing platform, download the SFX asset first and place it at the event time:

npx framevideo chanjing sound-effect list --compact
npx framevideo chanjing sfx download --id <effect-id> --volume 0.8 --json

Keep SFX local under assets/sfx/. Use short, event-specific <audio> clips with data-start set to the exact cue time, data-track-index="30" or higher, and data-volume="0.6-1" depending on the mix.

Timeline Contract

• All timelines start { paused: true } — the player controls playback
• Register every timeline: window.__timelines["<composition-id>"] = tl
• Framework auto-nests sub-timelines — do NOT manually add them
• Duration comes from data-duration, not from GSAP timeline length
• Never create empty tweens to set duration

Rules (Non-Negotiable)

Deterministic: No Math.random(), Date.now(), or time-based logic. Use a seeded PRNG if you need pseudo-random values (e.g. mulberry32).

GSAP: Only animate visual properties (opacity, x, y, scale, rotation, color, backgroundColor, borderRadius, transforms). Do NOT animate visibility, display, or call video.play()/audio.play().

Animation conflicts: Never animate the same property on the same element from multiple timelines simultaneously.

No repeat: -1: Infinite-repeat timelines break the capture engine. Calculate the exact repeat count from composition duration: repeat: Math.ceil(duration / cycleDuration) - 1.

Synchronous timeline construction: Never build timelines inside async/await, setTimeout, or Promises. The capture engine reads window.__timelines synchronously after page load. Fonts are embedded by the compiler, so they're available immediately — no need to wait for font loading.

Never do:

1. Forget window.__timelines registration
2. Use video for audio — always muted video + separate <audio>
3. Nest video inside a timed div — use a non-timed wrapper
4. Use data-layer (use data-track-index) or data-end (use data-duration)
5. Animate video element dimensions — animate a wrapper div
6. Call play/pause/seek on media — framework owns playback
7. Create a top-level container without data-composition-id
8. Use repeat: -1 on any timeline or tween — always finite repeats
9. Build timelines asynchronously (inside async, setTimeout, Promise)
10. Use gsap.set() on clip elements from later scenes — they don't exist in the DOM at page load. Use tl.set(selector, vars, timePosition) inside the timeline at or after the clip's data-start time instead.
11. Use <br> in content text — forced line breaks don't account for actual rendered font width. Text that wraps naturally + a <br> produces an extra unwanted break, causing overlap. Let text wrap via max-width instead. Exception: short display titles where each word is deliberately on its own line (e.g., "THE\nIMMORTAL\nGAME" at 130px).

Scene Transitions (Non-Negotiable)

Every multi-scene composition MUST follow ALL of these rules. Violating any one of them is a broken composition.

1. ALWAYS use transitions between scenes. No jump cuts. No exceptions.
2. ALWAYS use entrance animations on every scene. Every element animates IN via gsap.from(). No element may appear fully-formed. If a scene has 5 elements, it needs 5 entrance tweens.
3. NEVER use exit animations except on the final scene. This means: NO gsap.to() that animates opacity to 0, y offscreen, scale to 0, or any other "out" animation before a transition fires. The transition IS the exit. The outgoing scene's content MUST be fully visible at the moment the transition starts.
4. Final scene only: The last scene may fade elements out (e.g., fade to black). This is the ONLY scene where gsap.to(..., { opacity: 0 }) is allowed.

WRONG — exit animation before transition:

// BANNED — this empties the scene before the transition can use it
tl.to("#s1-title", { opacity: 0, y: -40, duration: 0.4 }, 6.5);
tl.to("#s1-subtitle", { opacity: 0, duration: 0.3 }, 6.7);
// transition fires on empty frame

RIGHT — entrance only, transition handles exit:

// Scene 1 entrance animations
tl.from("#s1-title", { y: 50, opacity: 0, duration: 0.7, ease: "power3.out" }, 0.3);
tl.from("#s1-subtitle", { y: 30, opacity: 0, duration: 0.5, ease: "power2.out" }, 0.6);
// NO exit tweens — transition at 7.2s handles the scene change
// Scene 2 entrance animations
tl.from("#s2-heading", { x: -40, opacity: 0, duration: 0.6, ease: "expo.out" }, 8.0);

Animation Guardrails

• Offset first animation 0.1-0.3s (not t=0)
• Vary eases across entrance tweens — use at least 3 different eases per scene
• Don't repeat an entrance pattern within a scene
• Avoid full-screen linear gradients on dark backgrounds (H.264 banding — use radial or solid + localized glow)
• 60px+ headlines, 20px+ body, 16px+ data labels for rendered video
• font-variant-numeric: tabular-nums on number columns

If no frame.md or design.md exists, follow house-style.md for aesthetic defaults.

Typography and Assets

• Built-in fonts: Write the font-family you want in CSS — the compiler embeds supported fonts automatically.
• Custom fonts: If the spec (frame.md or design.md) names a font that isn't built-in, the user must provide .woff2 files in a fonts/ directory. If missing, warn before writing HTML. When files exist, add @font-face declarations pointing to the local files.
• Add crossorigin="anonymous" to external media
• For dynamic text overflow, use window.__framevideo.fitTextFontSize(text, { maxWidth, fontFamily, fontWeight })
• All files live at the project root alongside index.html; sub-compositions use ../

Editing Existing Compositions

• Read actual files, don't guess. When editing, extending, or creating companion compositions, read the existing source. Don't reconstruct hex codes from memory. Don't guess GSAP easing patterns. The composition IS the spec — extract exact values from it.
• Match existing fonts, colors, animation patterns from what you read
• Only change what was requested
• Preserve timing of unrelated clips

Output Checklist

Chanjing OAuth During Authoring

When a requested video needs Chanjing-backed features (public voices, platform speech, digital humans, or any Studio panel reporting missing Chanjing auth), invoke the chanjing-digital-human skill — especially Auth Contract and Missing Credentials UX. Do not stop at terminal env-var guidance when preview/Studio login is available.

Never print, echo, or commit tokens or credential-store contents. Do not fake generated assets when auth is missing; continue with placeholders only if the user accepts that as an interim state.

Output Checklist

Fast (run immediately, block on results):

• npx framevideo lint and npx framevideo validate both pass
• Design adherence verified if a design spec (frame.md or design.md) exists

Slow (run in parallel while presenting the preview to the user):

• npx framevideo inspect passes, or every reported overflow is intentionally marked
• Contrast warnings addressed (see Quality Checks below)
• Animation choreography verified (see Quality Checks below)
• framevideo-visual-qa applied for new compositions and significant visual changes

Quality Checks

Visual Inspect

framevideo inspect runs the composition in headless Chrome, seeks through the timeline, and maps visual layout issues with timestamps, selectors, bounding boxes, and fix hints. Run it after lint and validate:

npx framevideo inspect
npx framevideo inspect --json

Failures usually mean text is spilling out of a bubble/card, a fixed-size label is clipping dynamic copy, or text has moved off the canvas. Fix by increasing container size or padding, reducing font size or letter spacing, adding a real max-width so text wraps inside the container, or using window.__framevideo.fitTextFontSize(...) for dynamic copy.

Use --samples 15 for dense videos and --at 1.5,4,7.25 for specific hero frames. Repeated static issues are collapsed by default to avoid flooding agent context. If overflow is intentional for an entrance/exit animation, mark the element or ancestor with data-layout-allow-overflow. If a decorative element should never be audited, mark it with data-layout-ignore.

framevideo layout is the compatibility alias for the same check.

Contrast

framevideo validate runs a WCAG contrast audit by default. It seeks to 5 timestamps, screenshots the page, samples background pixels behind every text element, and computes contrast ratios. Failures appear as warnings:

⚠ WCAG AA contrast warnings (3):
  · .subtitle "secondary text" — 2.67:1 (need 4.5:1, t=5.3s)

If warnings appear:

• On dark backgrounds: brighten the failing color until it clears 4.5:1 (normal text) or 3:1 (large text, 24px+ or 19px+ bold)
• On light backgrounds: darken it
• Stay within the palette family — don't invent a new color, adjust the existing one
• Re-run framevideo validate until clean

Use --no-contrast to skip if iterating rapidly and you'll check later.

Design Adherence

If a design spec (frame.md or design.md) exists, verify the composition follows it after authoring. Read the HTML and check:

1. Colors — every hex value in the composition appears in the spec's palette section (however the user labeled it: Colors, Palette, Theme, etc.). Flag any invented colors.
2. Typography — font families and weights match the spec's type spec. No substitutions.
3. Corners — border-radius values match the declared corner style, if specified.
4. Spacing — padding and gap values fall within the declared density range, if specified.
5. Depth — shadow usage matches the declared depth level, if specified (flat = none, subtle = light, layered = glows).
6. Avoidance rules — if the spec has a section listing things to avoid (commonly "What NOT to Do", "Don'ts", "Anti-patterns", or "Do's and Don'ts"), verify none are present.

Report violations as a checklist. Fix each one before serving.

If no design spec exists (house-style-only path), verify:

1. Palette consistency — the same bg, fg, and accent colors are used across all scenes. No per-scene color invention.
2. No lazy defaults — check the composition against house-style.md's "Lazy Defaults to Question" list. If any appear, they must be a deliberate choice for the content, not a default.

Animation Map

After authoring animations, run the animation map to verify choreography:

node skills/framevideo/scripts/animation-map.mjs <composition-dir> \
  --out <composition-dir>/.framevideo/anim-map

Outputs a single animation-map.json with:

• Per-tween summaries: "#card1 animates opacity+y over 0.50s. moves 23px up. fades in. ends at (120, 200)"
• ASCII timeline: Gantt chart of all tweens across the composition duration
• Stagger detection: reports actual intervals ("3 elements stagger at 120ms")
• Dead zones: periods over 1s with no animation — intentional hold or missing entrance?
• Element lifecycles: first/last animation time, final visibility
• Scene snapshots: visible element state at 5 key timestamps
• Flags: offscreen, collision, invisible, paced-fast (under 0.2s), paced-slow (over 2s)

Read the JSON. Scan summaries for anything unexpected. Check every flag — fix or justify. Verify the timeline shows the intended choreography rhythm. Re-run after fixes.

Skip on small edits (fixing a color, adjusting one duration). Run on new compositions and significant animation changes.

References (loaded on demand)

• framevideo-visual-qa skill — Visual QA for safe areas, overlap, overflow, contrast, dynamic text fitting, and motion collisions. Use after new compositions or major layout/caption/asset changes.

• references/captions.md — Captions, subtitles, lyrics, karaoke synced to audio. Tone-adaptive style detection, per-word styling, text overflow prevention, caption exit guarantees, word grouping. Read when adding any text synced to audio timing.

• references/audio-reactive.md — Audio-reactive animation: map frequency bands and amplitude to GSAP properties. Read when visuals should respond to music, voice, or sound.

• references/css-patterns.md — CSS+GSAP marker highlighting: highlight, circle, burst, scribble, sketchout. Deterministic, fully seekable. Read when adding visual emphasis to text.

• references/video-composition.md — Video-medium rules: density, color presence, scale, frame composition, the design spec as brand not layout. Always read — these override web instincts.

• references/beat-direction.md — Beat planning: concept, mood, choreography verbs, rhythm templates, transition decisions, depth layers. Always read for multi-scene compositions.

• references/typography.md — Typography: font pairing, OpenType features, dark-background adjustments, font discovery script. Always read — every composition has text.

• references/motion-principles.md — Motion design principles, image motion treatment, load-bearing GSAP rules. Always read — every composition has motion.

• references/techniques.md — 13 primitive animation techniques with code patterns: SVG drawing, Canvas 2D, CSS 3D, kinetic type, Lottie, video compositing, typing, variable fonts, MotionPath, velocity transitions, audio-reactive, clip-path reveals, WebGL shaders. Adapt the patterns — don't copy-paste. (For pre-built UI templates — terminal chrome, device mockups, moodboard layouts — see registry/blocks/.)

• references/html-in-canvas-patterns.md — HTML-in-Canvas patterns: live DOM as GPU texture via drawElementImage + layoutsubtree. Shared boilerplate + ~6 effect recipes (iPhone/MacBook mockups, liquid glass, magnetic, portal, shatter, text cursor). Use for 1–3 hero beats per video.

• references/narration.md — Pacing, tone, script structure, number pronunciation, opening line patterns. Read when the composition includes voiceover or TTS.

• references/design-picker.md — Create a design.md via visual picker. Read when no frame.md or design.md exists and the user wants to create one.

• visual-styles.md — 8 named visual styles with hex palettes, GSAP easing signatures, and shader pairings. Read when user names a style or when generating a design spec.

• house-style.md — Default motion, sizing, and color palettes when no frame.md or design.md is specified.

• patterns.md — PiP, title cards, slide show patterns.

• data-in-motion.md — Data, stats, and infographic patterns.

• references/transcript-guide.md — Caption-side transcript handling: input formats, mandatory quality check, cleaning JS, OpenAI/Groq API fallback, "if no transcript exists" flow. (For the transcribe CLI invocation, model selection rules, and the .en gotcha, see the framevideo-media skill.)

• references/dynamic-techniques.md — Dynamic caption animation techniques (karaoke, clip-path, slam, scatter, elastic, 3D).

• references/transitions.md — Scene transitions: crossfades, wipes, reveals, shader transitions. Energy/mood selection, CSS vs WebGL guidance. Always read for multi-scene compositions — scenes without transitions feel like jump cuts.

  • transitions/catalog.md — Hard rules, scene template, and routing to per-type implementation code.
  • Shader transitions are in @framevideo/shader-transitions (packages/shader-transitions/) — read package source, not skill files.

GSAP patterns and effects are in the /gsap skill.