101-skills/superpowers

explainer-video-guide

Explainer video production guide: scripting, voiceover, visuals, and assembly.

ソースを見る

使い方

  1. インストールコマンドをコピーし、自分の環境へ導入する前にソースを確認します。
  2. 必要なツール、認証情報、対応環境を原文で確認します。
  3. 入力と成果物を指定し、出力を資料と照合します。
npx skills add https://github.com/101-skills/superpowers --skill explainer-video-guide

開始前の確認

  • 導入にはモデル契約、API枠、ファイルへのアクセス許可は含まれません。
  • スター数や導入数は活動の指標であり、独立した品質・安全性試験ではありません。
リポジトリの原文

見出し、例、コード、表、リンク、参照画像を含む原文を表示しています。

Install the belt CLI skill: npx skills add belt-sh/cli

Explainer Video Guide

Create explainer videos from script to final cut via inference.sh CLI.

Quick Start

Requires inference.sh CLI (belt). Install instructions
bash
belt login

# Generate a scene for an explainer
belt app run google/veo-3-1-fast --input '{
  "prompt": "Clean motion graphics style animation, abstract data flowing between connected nodes, blue and white color scheme, professional corporate aesthetic, smooth transitions"
}'

Script Formulas

Problem-Agitate-Solve (PAS) — 60 seconds

SectionDurationContentWord Count
Problem10sState the pain point the viewer has~25 words
Agitate10sShow why it's worse than they think~25 words
Solution15sIntroduce your product/idea~35 words
How It Works20sShow 3 key steps or features~50 words
CTA5sOne clear next action~12 words

Before-After-Bridge (BAB) — 90 seconds

SectionDurationContent
Before15sShow the current frustrating state
After15sShow the ideal outcome
Bridge40sExplain how your product gets them there
Social Proof10sQuick stat or testimonial
CTA10sClear next step

Feature Spotlight — 30 seconds (social)

SectionDurationContent
Hook3sSurprising fact or question
Feature15sShow one feature solving one problem
Result7sThe outcome/benefit
CTA5sTry it / Learn more

Pacing Rules

Content TypeWords Per MinuteNotes
Standard narration150 wpmConversational pace
Complex/technical120 wpmAllow processing time
Energetic/social170 wpmFaster for short-form
Children's content100 wpmClear and slow

Key rule: 1 scene per key message. Don't pack multiple ideas into one visual.

Scene Duration Guidelines

  • Establishing shot: 3-5 seconds
  • Feature demonstration: 5-8 seconds
  • Text/stat on screen: 3-4 seconds (must be readable)
  • Transition: 0.5-1 second
  • CTA screen: 3-5 seconds

Visual Production

Scene Types

bash
# Product in context
belt app run google/veo-3-1-fast --input '{
  "prompt": "Clean product demonstration video, hands typing on a laptop showing a dashboard interface, bright modern office, soft natural lighting, professional"
}'

# Abstract concept visualization
belt app run bytedance/seedance-2-0 --input '{
  "prompt": "Abstract motion graphics, colorful data streams connecting floating geometric shapes, smooth fluid animation, dark background with glowing elements, tech aesthetic",
  "generate_audio": true
}'

# Lifestyle/outcome shot
belt app run google/veo-3-1-fast --input '{
  "prompt": "Happy person relaxing on couch with laptop, smiling at screen, bright airy living room, warm afternoon light, satisfied customer feeling, lifestyle commercial style"
}'

# Before/after comparison
belt app run falai/flux-dev-lora --input '{
  "prompt": "Split screen comparison, left side cluttered messy desk with papers and stress, right side clean organized minimalist workspace, dramatic difference, clean design"
}'

Image-to-Video for Scenes

bash
# Generate a still frame first
belt app run falai/flux-dev-lora --input '{
  "prompt": "Professional workspace with glowing holographic interface, futuristic but clean, blue accent lighting"
}'

# Animate it
belt app run falai/wan-2-5-i2v --input '{
  "prompt": "Gentle camera push in, holographic elements subtly floating and rotating, soft ambient light shifts",
  "image": "path/to/workspace-still.png"
}'

Voiceover Production

Script Writing Tips

  • Short sentences. Max 15 words per sentence.
  • Active voice. "You can track your data" not "Your data can be tracked."
  • Conversational tone. Read it aloud — if it sounds stiff, rewrite.
  • One idea per sentence. One sentence per visual beat.

Generating Voiceover

bash
# Professional narration with Dia TTS
belt app run falai/dia-tts --input '{
  "prompt": "[S1] Tired of spending hours on reports that nobody reads? There is a better way. Meet DataFlow. It turns your raw data into visual stories... in seconds. Just connect your source, pick a template, and share. Try DataFlow free today."
}'

Pacing Control in TTS

TechniqueEffectExample
Period .Medium pause"This changes everything. Here's how."
Ellipsis ...Long pause (dramatic)"And the result... was incredible."
Comma ,Short pause"Fast, simple, powerful."
Exclamation !Emphasis/energy"Start building today!"
Question ?Rising intonation"What if there was a better way?"

Music & Audio

Background Music Guidelines

  • Volume: 20-30% under narration (duck 6-12dB when voice plays)
  • Style: match the brand tone (corporate = ambient electronic, startup = upbeat indie)
  • Structure: intro swell (first 3s) -> subtle loop under narration -> swell at CTA
  • No vocals: instrumental only under narration
bash
# Generate background music
belt app run <music-gen-app> --input '{
  "prompt": "upbeat corporate background music, modern electronic, 90 BPM, positive and professional, no vocals, suitable for product explainer video"
}'

Assembly Pipeline

Full Production Workflow

bash
# 1. Generate voiceover
belt app run falai/dia-tts --input '{
  "prompt": "[S1] Your script here..."
}'

# 2. Generate scene visuals (in parallel)
belt app run google/veo-3-1-fast --input '{"prompt": "scene 1 description"}' --no-wait
belt app run google/veo-3-1-fast --input '{"prompt": "scene 2 description"}' --no-wait
belt app run google/veo-3-1-fast --input '{"prompt": "scene 3 description"}' --no-wait

# 3. Merge scenes into sequence
belt app run infsh/media-merger --input '{
  "media": ["scene1.mp4", "scene2.mp4", "scene3.mp4"]
}'

# 4. Add voiceover to video
belt app run infsh/video-audio-merger --input '{
  "video": "merged-scenes.mp4",
  "audio": "voiceover.mp3"
}'

# 5. Add captions
belt app run infsh/caption-videos --input '{
  "video": "final-with-audio.mp4",
  "caption_file": "captions.srt"
}'

Video Length by Format

FormatLengthPlatform
Social teaser15-30sTikTok, Instagram Reels, YouTube Shorts
Product demo60-90sWebsite, landing page
Feature explainer90-120sYouTube, email
Tutorial/walkthrough2-5minYouTube, help center
Investor pitch video2-3minPitch deck supplement

Transition Types

TransitionWhen to UseEffect
CutDefault between related scenesClean, professional
Dissolve/CrossfadeTime passing, mood shiftSoft, contemplative
WipeNew topic or sectionClear separation
Zoom/PushDrilling into detailFocus attention
Match cutVisual similarity between scenesClever, memorable

Common Mistakes

MistakeProblemFix
Script too wordyVoiceover rushed, viewer overwhelmedCut to 150 wpm max
No hook in first 3sViewers leave immediatelyStart with the problem or surprising stat
Visuals lag narrationConfusing disconnectVisuals should match or slightly precede words
Background music too loudCan't hear narrationDuck music 6-12dB under voice
No captions85% of social video watched silentAlways add captions
Too many ideasViewer retains nothingOne core message per video

Related Skills

bash
npx skills add inference-sh/skills@ai-video-generation
npx skills add inference-sh/skills@video-prompting-guide
npx skills add inference-sh/skills@text-to-speech
npx skills add inference-sh/skills@prompt-engineering

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