modern-short-video（现代短视频）

Modern Short Video Skill

Create professional, modern product launch videos using Remotion and React.

Prerequisites (MANDATORY)

WARNING: Do NOT skip this step. Skipping will result in missing rich expression opportunities.

This skill extends Remotion best practices. You MUST do both:

1. Load the skill first: /remotion-best-practices
2. Read the SKILL.md of remotion-best-practices and identify which rules are relevant to the product (maps, charts, text animations, 3D, lottie, etc.)

Workflow

Step 1: Analyze Product & Select Rich Expressions (CRITICAL)

Before asking for screenshots, analyze the product and find relevant rich expressions from remotion-best-practices.

Replace static screenshots with dynamic content wherever possible:

• Map app → animated map with route drawing
• Dashboard → animated charts
• Text app → typewriter effects
• etc.

Read the relevant rule files from remotion-best-practices and use them.

Step 2: Device, Theme & BGM Questions

Use AskUserQuestion to ask:

1. Device Type: Is the product primarily for smartphone (SP) or PC/Desktop?

- SP (Smartphone) → Use phone mockup frame - PC/Desktop → Use browser/desktop mockup frame

1. Screenshot Theme: Should screenshots be in Light mode or Dark mode?

- Dark mode (Recommended) → Blends with video background (#0a0a0a) - Light mode → Higher contrast, screenshots stand out more

1. BGM (Background Music): Add background music?

- Yes (Recommended) → Download free music from Pixabay - No → Create video without BGM

Step 3: Collect Screenshots

Note: Screenshots for scenes using rich expressions (Step 1) are not needed.

Required images (place in public/ folder):

Step 4: Collect Content

Required information:

• Product name
• One-line tagline/concept
• Feature 1: Title + short description
• Feature 2: Title + short description (optional)
• Feature 3: Title + short description (optional)
• CTA text (e.g., "Try it free")
• URL

Step 5: Verify Assets

ls public/*.png

Step 6: Create Composition

Create src/remotion/[ProductName]/[ProductName]Intro.tsx with all scenes.

Step 7: Register & Calculate Duration

Add to Root.tsx. IMPORTANT: Calculate durationInFrames correctly:

durationInFrames = Sum of scene durations - (transition duration × number of transitions)

See rules/duration-calculation.md for details.

Step 8: Test

Run pnpm run dev (or bun run remotion) and preview the video.

Scene Structure (8 Scenes)

┌─────────────────────────────────────────────────────────────┐
│  1. REVEAL     2. CONCEPT    3. MOCKUPS                     │
│  (2-3s)        (3-4s)        (3-4s)                         │
│  Logo/Name     Value prop    Product preview                │
├─────────────────────────────────────────────────────────────┤
│  4. FEATURE 1  5. FEATURE 2  6. FEATURE 3                   │
│  (3-4s each)   (optional)    (optional)                     │
│  Screenshot +  Screenshot +  Screenshot +                   │
│  Title/Desc    Title/Desc    Title/Desc                     │
├─────────────────────────────────────────────────────────────┤
│  7. OUTRO      8. CTA                                       │
│  (2-3s)        (3-4s)                                       │
│  Summary       URL + Action                                 │
└─────────────────────────────────────────────────────────────┘

Scene Details

Total Duration: 15-25 seconds (depending on feature count)

Design Rules

Detailed Guidelines

For comprehensive guidance, read these rule files:

• rules/design-principles.md - Visual design system
• rules/scene-structure.md - Scene composition patterns
• rules/visual-elements.md - Mockups, typography, colors
• rules/animation-patterns.md - Motion design patterns
• rules/code-templates.md - Ready-to-use Remotion components
• rules/duration-calculation.md - How to calculate total video duration
• rules/bgm.md - Background music source and implementation

Quick Reference: Scene Components

// Scene order
<TransitionSeries>
  <RevealScene />      {/* 1. Logo/Name */}
  <ConceptScene />     {/* 2. Value proposition */}
  <MockupsScene />     {/* 3. Main product mockup */}
  <FeatureScene n={1} /> {/* 4. Feature 1 */}
  <FeatureScene n={2} /> {/* 5. Feature 2 (if provided) */}
  <FeatureScene n={3} /> {/* 6. Feature 3 (if provided) */}
  <OutroScene />       {/* 7. Summary */}
  <CTAScene />         {/* 8. Call to action */}
</TransitionSeries>

Checklist Before Delivery

• Prerequisites loaded (/remotion-best-practices executed and relevant rules read)
• Rich expressions used where applicable (maps, charts, text animations, etc.)
• Screenshots collected for scenes not using rich expressions
• Screenshots are high quality (2x resolution preferred)
• Text is readable at 720p
• Total duration 15-25 seconds
• durationInFrames correctly calculated (subtract transition overlaps!)
• No black frames at the end of video
• Transitions are smooth (fade, 15 frames)
• CTA and URL clearly visible
• BGM added (optional, volume ~0.25)