Loonghao Vx Remotion

Remotion Skill

Create videos programmatically using React. This skill provides guidance and tools for working with Remotion, a framework that allows you to build video content with React components.

Overview

Remotion is a React-based video creation framework that lets you:

• Build videos with familiar React concepts
• Use JavaScript/TypeScript for dynamic content
• Render videos programmatically
• Integrate video creation into applications
• Build parameterizable and reusable video components

When to Use This Skill

Use the Remotion skill when:

• Creating a new Remotion project
• Adding video generation to an existing React project
• Setting up Remotion compositions
• Configuring video rendering pipelines
• Creating reusable video components
• Integrating video rendering with server-side applications

Quick Start

Creating a New Remotion Project

# Using npx (recommended)
npx create-video my-video

# Or using npm init
npm init video my-video

# Or using yarn
yarn create video my-video

# Or using pnpm
pnpm create video my-video

Adding Remotion to Existing Project

# Install core package
npm install remotion

# Install CLI (for development)
npm install -D @remotion/cli

# Optional: Install renderer for server-side rendering
npm install @remotion/renderer

Project Structure

A typical Remotion project structure:

my-video/
├── src/
│   ├── Root.tsx           # Root composition
│   ├── Video.tsx          # Main video component
│   ├── components/        # Reusable components
│   │   ├── Background.tsx
│   │   ├── Text.tsx
│   │   └── ...
│   ├── compositions/      # Video compositions
│   │   ├── MainComp.tsx
│   │   └── ...
│   └── index.tsx         # Entry point
├── package.json
├── remotion.config.ts    # Configuration
└── public/
    └── assets/

Core Concepts

1. Composition

A composition is a video scene with specific duration and frame rate:

import {Composition} from 'remotion';
import {MyVideo} from './Video';

export const RemotionRoot: React.FC = () => {
  return (
    <>
      <Composition
        id="my-video"
        component={MyVideo}
        durationInFrames={300}  // 10 seconds at 30fps
        fps={30}
        width={1920}
        height={1080}
      />
    </>
  );
};

2. Video Component

import {AbsoluteFill, useCurrentFrame, useVideoConfig} from 'remotion';

export const MyVideo: React.FC = () => {
  const frame = useCurrentFrame();
  const {fps} = useVideoConfig();

  // Animation based on frame
  const opacity = frame / 60;  // Fade in over 2 seconds

  return (
    <AbsoluteFill style={{backgroundColor: 'white'}}>
      <AbsoluteFill style={{opacity}}>
        <h1>Hello, Remotion!</h1>
        <p>Frame: {frame}</p>
      </AbsoluteFill>
    </AbsoluteFill>
  );
};

3. Configuration

Create remotion.config.ts:

import {Config} from '@remotion/cli/config';

Config.setVideoImageFormat('jpeg');
Config.setOverwriteOutput(true);
Config.setBrowserExecutable('/Applications/Google Chrome.app/Contents/MacOS/Google Chrome');

Common Patterns

Animations

Using spring for smooth animations:

import {spring, useCurrentFrame, useVideoConfig} from 'remotion';

export const AnimatedElement: React.FC = () => {
  const frame = useCurrentFrame();
  const {fps} = useVideoConfig();

  const scale = spring({
    frame,
    fps,
    config: {
      damping: 200,
      stiffness: 100,
    },
  });

  return (
    <div style={{transform: `scale(${scale})`}}>
      Animated Content
    </div>
  );
};

Input Props

Pass data to compositions:

// Composition definition
<Composition
  id="my-video"
  component={MyVideo}
  durationInFrames={300}
  fps={30}
  width={1920}
  height={1080}
  defaultProps={{
    title: "Hello World",
    color: "blue",
    speed: 1.0,
  }}
/>

// Usage
export const MyVideo: React.FC<{title: string; color: string; speed: number}> = ({
  title,
  color,
  speed,
}) => {
  return <div style={{color}}>{title}</div>;
};

Sequence

Chain animations sequentially:

import {Sequence} from 'remotion';

export const SequenceExample: React.FC = () => {
  return (
    <AbsoluteFill>
      <Sequence from={0} durationInFrames={60}>
        <FirstScene />
      </Sequence>
      <Sequence from={60} durationInFrames={60}>
        <SecondScene />
      </Sequence>
      <Sequence from={120} durationInFrames={180}>
        <FinalScene />
      </Sequence>
    </AbsoluteFill>
  );
};

Loop

Repeat animations:

import {Loop} from 'remotion';

export const LoopExample: React.FC = () => {
  return (
    <Loop durationInFrames={30} times={10}>
      <BouncingBall />
    </Loop>
  );
};

Rendering Videos

Preview in Browser

npx remotion preview src/Root.tsx

Render to MP4

npx remotion render src/Root.tsx my-video --output=output.mp4

Render with Parameters

npx remotion render src/Root.tsx my-video --output=output.mp4 --props='{"title":"Custom Title"}'

Server-Side Rendering

import {bundle} from '@remotion/bundler';
import {renderMedia, selectComposition} from '@remotion/renderer';

async function renderVideo() {
  // Bundle the video
  const bundleLocation = await bundle({
    entryPoint: './src/Root.tsx',
    webpackOverride: (config) => config,
  });

  // Select composition
  const composition = await selectComposition({
    serveUrl: bundleLocation,
    id: 'my-video',
    inputProps: {},
  });

  // Render
  await renderMedia({
    composition,
    serveUrl: bundleLocation,
    codec: 'h264',
    outputLocation: `output/${composition.id}.mp4`,
    inputProps: {},
  });
}

Best Practices

1. Component Structure

• Keep components small and reusable
• Use TypeScript for type safety
• Extract animations to separate hooks or utilities

2. Performance

• Use staticDuration when composition length doesn't change
• Optimize images and assets
• Use useCurrentFrame sparingly in complex components

3. Organization

src/
├── compositions/      # Define video scenes
├── components/        # Reusable UI elements
├── hooks/           # Custom hooks for animations
├── utils/           # Helper functions
└── assets/          # Images, fonts, etc.

4. Asset Management

• Use public/ folder for static assets
• Import images directly in components
• Optimize images before including in video

Troubleshooting

Video Not Rendering

1. Check Chrome/Chromium is installed
2. Verify composition ID matches
3. Ensure output directory exists
4. Check for console errors in preview

Performance Issues

1. Reduce composition size during development
2. Use lower resolution for testing
3. Minimize expensive computations in render
4. Use staticDuration when possible

Memory Issues

# Reduce memory usage
NODE_OPTIONS=--max-old-space-size=4096 npx remotion render src/Root.tsx my-video

Advanced Features

Audio Integration

import {Audio, useAudioData} from 'remotion';

export const AudioExample: React.FC = () => {
  const {audioData} = useAudioData('/path/to/audio.mp3');

  return (
    <>
      <Audio src="/path/to/audio.mp3" />
      {/* Visualize audio if needed */}
    </>
  );
};

Transitions

import {TransitionSeries} from '@remotion/transitions';

export const TransitionExample: React.FC = () => {
  return (
    <TransitionSeries>
      <TransitionSeries.Transition
        in={<FirstScene />}
        out={<SecondScene />}
      >
        <TransitionSeries.Sequence name="first" durationInFrames={60}>
          <FirstScene />
        </TransitionSeries.Sequence>
        <TransitionSeries.Sequence name="second" durationInFrames={60}>
          <SecondScene />
        </TransitionSeries.Sequence>
      </TransitionSeries.Transition>
    </TransitionSeries>
  );
};

Lambda Rendering

For serverless video rendering:

npm install @remotion/lambda

# Deploy to Lambda
npx remotion lambda sites create src/ --site-name=my-site

# Render on Lambda
npx remotion lambda render my-video --output=output.mp4

Resources

• Remotion Documentation
• Remotion Examples
• Remotion GitHub
• Remotion Discord
• Remotion Twitter

Getting Help

When working with Remotion:

1. Check the official documentation
2. Review the examples repository
3. Join the Discord community
4. Search GitHub issues
5. Ask in the Remotion community forums

Next Steps

After setting up your Remotion project:

1. Create your first composition
2. Build reusable components
3. Test animations in the preview
4. Render your first video
5. Optimize for performance
6. Deploy your rendering pipeline

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