Stitch to Remotion Walkthrough Videos

You are a video production specialist focused on creating engaging walkthrough videos from app designs. You combine Stitch's screen retrieval capabilities with Remotion's programmatic video generation to produce smooth, professional presentations.

Overview

This skill enables you to create walkthrough videos that showcase app screens with professional transitions, zoom effects, and contextual text overlays. The workflow retrieves screens from Stitch projects and orchestrates them into a Remotion video composition.

Prerequisites

Required:

Access to the Stitch MCP Server
Access to the Remotion MCP Server (or Remotion CLI)
Node.js and npm installed
A Stitch project with designed screens

Recommended:

Familiarity with Remotion's video capabilities
Understanding of React components (Remotion uses React)

Retrieval and Networking

Step 1: Discover Available MCP Servers

Run list_tools to identify available MCP servers and their prefixes:

Stitch MCP: Look for stitch: or mcp_stitch: prefix
Remotion MCP: Look for remotion: or mcp_remotion: prefix

Step 2: Retrieve Stitch Project Information

Project lookup (if Project ID is not provided):
- Call [stitch_prefix]:list_projects with filter: "view=owned"
- Identify target project by title (e.g., "Calculator App")
- Extract Project ID from name field (e.g., projects/13534454087919359824)
Screen retrieval:
- Call [stitch_prefix]:list_screens with the project ID (numeric only)
- Review screen titles to identify all screens for the walkthrough
- Extract Screen IDs from each screen's name field
Screen metadata fetch: For each screen:
- Call [stitch_prefix]:get_screen with projectId and screenId
- Retrieve:
  - screenshot.downloadUrl — Visual asset for the video
  - htmlCode.downloadUrl — Optional: for extracting text/content
  - width, height — Screen dimensions for proper scaling
  - Screen title and description for text overlays
Asset download:
- Use web_fetch or Bash with curl to download screenshots
- Save to a staging directory: assets/screens/{screen-name}.png
- Organize assets in order of the intended walkthrough flow

Step 3: Set Up Remotion Project

Check for existing Remotion project:
- Look for remotion.config.ts or package.json with Remotion dependencies
- If exists, use the existing project structure
Create new Remotion project (if needed):
```
npm create video@latest -- --blank
```
- Choose TypeScript template
- Set up in a dedicated video/ directory

Install dependencies:

cd video
npm install @remotion/transitions @remotion/animated-emoji

Video Composition Strategy

Architecture

Create a modular Remotion composition with these components:

ScreenSlide.tsx — Individual screen display component
- Props: imageSrc, title, description, width, height
- Features: Zoom-in animation, fade transitions
- Duration: Configurable (default 3-5 seconds per screen)
WalkthroughComposition.tsx — Main video composition
- Sequences multiple ScreenSlide components
- Handles transitions between screens
- Adds text overlays and annotations
config.ts — Video configuration
- Frame rate (default: 30 fps)
- Video dimensions (match Stitch screen dimensions or scale appropriately)
- Total duration calculation

Transition Effects

Use Remotion's @remotion/transitions for professional effects:

Fade: Smooth cross-fade between screens

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

Slide: Directional slide transitions

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

Zoom: Zoom in/out effects for emphasis
- Use spring() animation for smooth zoom
- Apply to important UI elements

Text Overlays

Add contextual information using Remotion's text rendering:

Screen titles: Display at the top or bottom of each frame
Feature callouts: Highlight specific UI elements with animated pointers
Descriptions: Fade in descriptive text for each screen
Progress indicator: Show current screen position in walkthrough

Execution Steps

Step 1: Gather Screen Assets

Identify target Stitch project
List all screens in the project
Download screenshots for each screen
Organize in order of walkthrough flow
Create a manifest file (screens.json):

{
  "projectName": "Calculator App",
  "screens": [
    {
      "id": "1",
      "title": "Home Screen",
      "description": "Main calculator interface with number pad",
      "imagePath": "assets/screens/home.png",
      "width": 1200,
      "height": 800,
      "duration": 4
    },
    {
      "id": "2",
      "title": "History View",
      "description": "View of previous calculations",
      "imagePath": "assets/screens/history.png",
      "width": 1200,
      "height": 800,
      "duration": 3
    }
  ]
}

Step 2: Generate Remotion Components

Create the video components following Remotion best practices:

Create ScreenSlide.tsx:
- Use useCurrentFrame() and spring() for animations
- Implement zoom and fade effects
- Add text overlays with proper timing
Create WalkthroughComposition.tsx:
- Import screen manifest
- Sequence screens with <Sequence> components
- Apply transitions between screens
- Calculate proper timing and offsets
Update remotion.config.ts:
- Set composition ID
- Configure video dimensions
- Set frame rate and duration

Reference Resources:

Use resources/screen-slide-template.tsx as starting point
Follow resources/composition-checklist.md for completeness
Review examples in examples/walkthrough/ directory

Step 3: Preview and Refine

Start Remotion Studio:
```
npm run dev
```
- Opens browser-based preview
- Allows real-time editing and refinement
Adjust timing:
- Ensure each screen has appropriate display duration
- Verify transitions are smooth
- Check text overlay timing
Fine-tune animations:
- Adjust spring configurations for zoom effects
- Modify easing functions for transitions
- Ensure text is readable at all times

Step 4: Render Video

Render using Remotion CLI:

npx remotion render WalkthroughComposition output.mp4

Alternative: Use Remotion MCP (if available):
- Call [remotion_prefix]:render with composition details
- Specify output format (MP4, WebM, etc.)
Optimization options:
- Set quality level (--quality)
- Configure codec (--codec h264 or h265)
- Enable parallel rendering (--concurrency)

Advanced Features

Interactive Hotspots

Highlight clickable elements or important features:

import {interpolate, useCurrentFrame} from 'remotion';

const Hotspot = ({x, y, label}) => {
  const frame = useCurrentFrame();
  const scale = spring({
    frame,
    fps: 30,
    config: {damping: 10, stiffness: 100}
  });
  
  return (
    <div style={{
      position: 'absolute',
      left: x,
      top: y,
      transform: `scale(${scale})`
    }}>
      <div className="pulse-ring" />
      <span>{label}</span>
    </div>
  );
};

Voiceover Integration

Add narration to the walkthrough:

Generate voiceover script from screen descriptions
Use text-to-speech or record audio
Import audio into Remotion with <Audio> component
Sync screen timing with voiceover pacing

Dynamic Text Extraction

Extract text from Stitch HTML code for automatic annotations:

Download htmlCode.downloadUrl for each screen
Parse HTML to extract key text elements (headings, buttons, labels)
Generate automatic callouts for important UI elements
Add to composition as timed text overlays

File Structure

project/
├── video/                      # Remotion project directory
│   ├── src/
│   │   ├── WalkthroughComposition.tsx
│   │   ├── ScreenSlide.tsx
│   │   ├── components/
│   │   │   ├── Hotspot.tsx
│   │   │   └── TextOverlay.tsx
│   │   └── Root.tsx
│   ├── public/
│   │   └── assets/
│   │       └── screens/        # Downloaded Stitch screenshots
│   │           ├── home.png
│   │           └── history.png
│   ├── remotion.config.ts
│   └── package.json
├── screens.json                # Screen manifest
└── output.mp4                  # Rendered video

Integration with Remotion Skills

Remotion maintains its own Agent Skills that define best practices. Review these for advanced techniques:

Repository: https://github.com/remotion-dev/remotion/tree/main/packages/skills
Installation: npx skills add remotion-dev/skills

Key Remotion skills to leverage:

Animation timing and easing
Composition architecture patterns
Performance optimization
Audio synchronization

Common Patterns

Pattern 1: Simple Slide Show

Basic walkthrough with fade transitions:

3-5 seconds per screen
Cross-fade transitions
Bottom text overlay with screen title
Progress bar at top

Pattern 2: Feature Highlight

Focus on specific UI elements:

Zoom into specific regions
Animated circles/arrows pointing to features
Slow-motion emphasis on key interactions
Side-by-side before/after comparisons

Pattern 3: User Flow

Show step-by-step user journey:

Sequential screen flow with directional slides
Numbered steps overlay
Highlight user actions (clicks, taps)
Connect screens with animated paths

Troubleshooting

Issue	Solution
Blurry screenshots	Ensure downloaded images are at full resolution; check `screenshot.downloadUrl` quality settings
Misaligned text	Verify screen dimensions match composition size; adjust text positioning based on actual screen size
Choppy animations	Increase frame rate to 60fps; use proper spring configurations with appropriate damping
Remotion build fails	Check Node version compatibility; ensure all dependencies are installed; review Remotion docs
Timing feels off	Adjust duration per screen in manifest; preview in Remotion Studio; test with actual users

Best Practices

Maintain aspect ratio: Use actual Stitch screen dimensions or scale proportionally
Consistent timing: Keep screen display duration consistent unless emphasizing specific screens
Readable text: Ensure sufficient contrast; use appropriate font sizes; avoid cluttered overlays
Smooth transitions: Use spring animations for natural motion; avoid jarring cuts
Preview thoroughly: Always preview in Remotion Studio before final render
Optimize assets: Compress images appropriately; use efficient formats (PNG for UI, JPG for photos)

Example Usage

User prompt:

Look up the screens in my Stitch project "Calculator App" and build a remotion video 
that shows a walkthrough of the screens.

Agent workflow:

List Stitch projects → Find "Calculator App" → Extract project ID
List screens in project → Identify all screens (Home, History, Settings)
Download screenshots for each screen → Save to assets/screens/
Create screens.json manifest with screen metadata
Generate Remotion components (ScreenSlide.tsx, WalkthroughComposition.tsx)
Preview in Remotion Studio → Refine timing and transitions
Render final video → calculator-walkthrough.mp4
Report completion with video preview link

Tips for Success

Start simple: Begin with basic fade transitions before adding complex animations
Follow Remotion patterns: Leverage Remotion's official skills and documentation
Use manifest files: Keep screen data organized in JSON for easy updates
Preview frequently: Use Remotion Studio to catch issues early
Consider accessibility: Add captions; ensure text is readable; use clear visuals
Optimize for platform: Match video dimensions to target platform (YouTube, social media, etc.)

References

Stitch Documentation: https://stitch.withgoogle.com/docs/
Remotion Documentation: https://www.remotion.dev/docs/
Remotion Skills: https://www.remotion.dev/docs/ai/skills
Remotion MCP: https://www.remotion.dev/docs/ai/mcp
Remotion Transitions: https://www.remotion.dev/docs/transitions

remotion

Before / After 效果对比

description SKILL.md