mastra-demo

name: mastra-demo description: Create professional demo videos with browser automation (GIF recording), ElevenLabs voiceover generation, and Remotion video composition. Automates the full workflow from script to rendered video.

Mastra Demo Skill

Create professional product demo videos by combining:

• Browser automation for GIF recording (via claude-in-chrome MCP)
• ElevenLabs voiceover generation
• Remotion video composition

Commands

Quick Start

# 1. Create a new demo project
/mastra-demo:init my-awesome-demo

# 2. Edit DEMO_SCRIPT.md with your content (or generate interactively)
/mastra-demo:script

# 3. Record browser GIFs for each segment
/mastra-demo:record

# 4. Generate voiceovers
/mastra-demo:audio

# 5. Build the video composition
/mastra-demo:compose

# 6. Render the final video
/mastra-demo:render

Prerequisites

• claude-in-chrome MCP: Browser automation extension for GIF recording
• ElevenLabs API key: For voiceover generation
• Node.js 18+: For Remotion
• ffprobe: For audio duration detection (comes with ffmpeg)

Project Structure

Demo projects created by this skill have this structure:

my-demo/
├── .env                    # ELEVENLABS_API_KEY
├── .mastra-demo-state.json # Execution state
├── DEMO_SCRIPT.md          # Script with segments
├── package.json            # Remotion dependencies
├── public/                 # Assets (GIFs, audio)
│   ├── segment-01.gif
│   ├── segment-01.mp3
│   └── ...
├── out/                    # Rendered output
│   └── demo.mp4
└── src/
    ├── Root.tsx
    ├── DemoVideo.tsx
    └── scenes/

Script Format

DEMO_SCRIPT.md defines your demo:

# Demo: Feature Name

## Narrative
Write the full story as continuous prose first.
This ensures natural flow across segments.

## Settings
fps: 30
voice: Daniel

## Title
text: "Feature Name"
subtitle: "Tagline"
duration: 5s

## Segments

### segment-01-intro
url: http://localhost:4111
voiceover: |
  This is the opening narration that connects
  naturally to the narrative above.
actions:
  - navigate: http://localhost:4111
  - wait: 2s
  - find: "Sign In button"
  - click: found element

## Outro
heading: "Get Started"
command: "npx create-mastra@latest"
links:
  - mastra.ai/docs

Narrative Flow

The key to great demos is narrative flow. Even though we record individual GIFs and audio segments, the voiceover must tell a cohesive story.

Good transitions:

• "Now that we're logged in..."
• "Here's where it gets interesting..."
• "Back in Mastra Studio, the difference is immediate..."

Bad patterns:

• Abrupt segment starts without context
• Bullet-point style narration
• No connection between segments

Browser Actions

Available actions for recording:

Voice Settings

Recommended ElevenLabs settings for professional demos:

• Voice: Daniel, Brian, George, or Chris
• Model: eleven_multilingual_v2
• Stability: 0.5
• Similarity boost: 0.75

References

For detailed documentation:

• references/script-format-reference.md - Complete DEMO_SCRIPT.md format
• references/gif-recording-reference.md - Browser automation patterns
• references/audio-generation-reference.md - ElevenLabs integration

Templates

The templates/ directory contains Remotion project files:

• React components for scenes (Title, DemoGif, Outro)
• Browser frame component
• Audio generation script
• Package configuration