Explainer video production guide: scripting, voiceover, visuals, and assembly. Covers script formulas, pacing rules, scene planning, and multi-tool pipelines. Use for: product demos, how-it-works videos, onboarding videos, social explainers. Triggers: explainer video, how to make explainer, product video, demo video, video production, video script, animated explainer, product demo video, tutorial video, onboarding video, walkthrough video, video pipeline
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Explainer video production guide: scripting, voiceover, visuals, and assembly. Covers script formulas, pacing rules, scene planning, and multi-tool pipelines. Use for: product demos, how-it-works videos, onboarding videos, social explainers. Triggers: explainer video, how to make explainer, product video, demo video, video production, video script, animated explainer, product demo video, tutorial video, onboarding video, walkthrough video, video pipeline
allowed-tools
Bash(belt *)
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.
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
Section
Duration
Content
Word Count
Problem
10s
State the pain point the viewer has
~25 words
Agitate
10s
Show why it's worse than they think
~25 words
Solution
15s
Introduce your product/idea
~35 words
How It Works
20s
Show 3 key steps or features
~50 words
CTA
5s
One clear next action
~12 words
Before-After-Bridge (BAB) — 90 seconds
Section
Duration
Content
Before
15s
Show the current frustrating state
After
15s
Show the ideal outcome
Bridge
40s
Explain how your product gets them there
Social Proof
10s
Quick stat or testimonial
CTA
10s
Clear next step
Feature Spotlight — 30 seconds (social)
Section
Duration
Content
Hook
3s
Surprising fact or question
Feature
15s
Show one feature solving one problem
Result
7s
The outcome/benefit
CTA
5s
Try it / Learn more
Pacing Rules
Content Type
Words Per Minute
Notes
Standard narration
150 wpm
Conversational pace
Complex/technical
120 wpm
Allow processing time
Energetic/social
170 wpm
Faster for short-form
Children's content
100 wpm
Clear 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
# 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
# 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
# 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
Technique
Effect
Example
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
# 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
# 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"
}'
