Lottie

Lottie for FrameVideo

When To Use

Use Lottie for:

• After Effects exports — designer provides .json or .lottie file
• Logo animations — animated brand marks and icons
• Pre-made animations — using LottieFiles library assets
• Complex vector motion — shape morphing, path animations
• Design handoff — designers work in AE, devs integrate directly

Do NOT Use

Avoid Lottie for:

• Code-driven animation — use gsap (more flexible)
• Simple transforms — use gsap or css-animations (lighter)
• 3D scenes — use three
• Text-heavy animation — Lottie handles text poorly, use HTML + GSAP
• Dynamic content — Lottie animations are static, use programmatic animation

Quick Start

Basic lottie-web animation:

<div id="logo-lottie" class="lottie-layer"></div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/bodymovin/5.12.2/lottie.min.js"></script>
<script>
  const anim = lottie.loadAnimation({
    container: document.getElementById("logo-lottie"),
    renderer: "svg",
    loop: false,        // REQUIRED for FrameVideo
    autoplay: false,    // REQUIRED for FrameVideo
    path: "assets/logo-reveal.json",
  });

  window.__fvLottie = window.__fvLottie || [];
  window.__fvLottie.push(anim);
</script>

<style>
  .lottie-layer { width: 100%; height: 100%; }
</style>

Key points:

1. Set autoplay: false and loop: false
2. Register on window.__fvLottie array
3. Load from local assets/, not remote URLs

Contract

• Load assets from local project files, usually under assets/.
• Set autoplay: false.
• Prefer loop: false unless the user explicitly wants a loop.
• Register every returned animation or player on window.__fvLottie.
• Keep the Lottie container dimensions stable with CSS.

The adapter seeks lottie-web with goToAndStop(timeMs, false) and dotLottie with frame or percentage APIs depending on player shape.

lottie-web Pattern

<div id="logo-lottie" class="lottie-layer"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bodymovin/5.12.2/lottie.min.js"></script>
<script>
  const anim = lottie.loadAnimation({
    container: document.getElementById("logo-lottie"),
    renderer: "svg",
    loop: false,
    autoplay: false,
    path: "assets/logo-reveal.json",
  });

  window.__fvLottie = window.__fvLottie || [];
  window.__fvLottie.push(anim);
</script>

.lottie-layer {
  width: 100%;
  height: 100%;
}

dotLottie Pattern

<canvas id="product-lottie" class="lottie-canvas"></canvas>
<script src="https://unpkg.com/@lottiefiles/dotlottie-web"></script>
<script>
  const player = new DotLottie({
    canvas: document.getElementById("product-lottie"),
    src: "assets/product-flow.lottie",
    autoplay: false,
    loop: false,
  });

  window.__fvLottie = window.__fvLottie || [];
  window.__fvLottie.push(player);
</script>

.lottie-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

Multiple Animations

Push each player into the same registry:

window.__fvLottie = window.__fvLottie || [];
window.__fvLottie.push(backgroundAnim);
window.__fvLottie.push(iconAnim);
window.__fvLottie.push(confettiAnim);

FrameVideo seeks them all to the same composition time.

Good Uses

• After Effects exports that are already known to render correctly in lottie-web.
• Logo reveals, icon loops, decorative accents, and product UI motion.
• Translating Remotion Lottie usage into plain FrameVideo HTML.

Avoid

• Relying on remote path URLs at render time.
• Starting playback with play().
• Assuming unsupported After Effects effects will survive export. Test the JSON or .lottie file in a browser first.
• Loading a player asynchronously and registering it after FrameVideo validation has already inspected the page.

Validation

After editing a Lottie composition:

npx framevideo lint
npx framevideo validate

Credits And References

• FrameVideo adapter source: packages/core/src/runtime/adapters/lottie.ts.
• lottie-web by Airbnb: https://github.com/airbnb/lottie-web
• lottie-web loadAnimation options: https://github.com/airbnb/lottie-web/wiki/loadAnimation-options
• dotLottie web player methods by LottieFiles: https://developers.lottiefiles.com/docs/dotlottie-player/dotlottie-web/methods