Agent-Skills.md

Agent Skills: CapCut-Style Animated Captions

CapCut-style animated word-level captions for viral video with FFmpeg. PROACTIVELY activate for: (1) Word-by-word caption highlighting, (2) Animated subtitle effects, (3) CapCut-style captions, (4) Karaoke-style text, (5) Bounce/pop text animations, (6) Color-changing words, (7) Emoji integration in captions, (8) Multi-style caption presets, (9) Trending caption styles, (10) Social media caption optimization. Provides: ASS subtitle generation scripts, word-level timing workflows, animation presets, color schemes, font recommendations, and platform-specific caption styles for TikTok, YouTube Shorts, and Instagram Reels.

UncategorizedID: josiahsiegel/claude-plugin-marketplace/viral-video-animated-captions

Repository

josiahsiegel/claude-plugin-marketplace
JosiahSiegelLicense: MIT
213

Install this agent skill to your local

pnpm dlx add-skill https://github.com/JosiahSiegel/claude-plugin-marketplace/tree/HEAD/plugins/ffmpeg-social-video/skills/viral-video-animated-captions

Skill Files

Browse the full folder contents for viral-video-animated-captions.

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plugins/ffmpeg-social-video/skills/viral-video-animated-captions/SKILL.md

Skill Metadata

Name
viral-video-animated-captions
Description
|

CapCut-Style Animated Captions

Use this skill to create burned-in social captions with word-level timing, pop/bounce/scale animations, karaoke highlighting, and platform-appropriate caption styles. This SKILL is a lean orchestrator; detailed ASS styles, scripts, formulas, and presets are preserved in references/caption-styles-and-generation.md.

When to Use

  • Word-by-word or phrase-by-phrase social captions
  • CapCut-style pop, bounce, sweep, karaoke, and typewriter captions
  • Whisper transcript to animated ASS conversion
  • TikTok, YouTube Shorts, Instagram Reels, and Facebook Reels caption styling
  • Caption readability, safe zones, accessibility, and mobile typography

Caption Workflow

  1. Generate transcript with word-level timestamps using Whisper or another ASR tool.
  2. Convert word timings into ASS events and styles.
  3. Use ASS timing units correctly: karaoke tags use centiseconds; animation tags use milliseconds.
  4. Burn ASS into the video with FFmpeg.
  5. Verify readability, safe-zone placement, audio sync, and final platform specs.

Minimal Burn-In Command

ffmpeg -i input.mp4 \
  -vf "ass=captions.ass" \
  -c:v libx264 -preset fast -crf 23 \
  -c:a copy \
  output_captioned.mp4

If audio copy fails because the output container cannot accept the source audio, re-encode audio with -c:a aac -b:a 128k.

Quick Style Selection

| Style | Effect | Best for | |---|---|---| | Word Pop | Each word scales in with overshoot | High-energy hooks, gaming, comedy | | Highlight Sweep | Full phrase visible, words highlight in sequence | Educational and professional explainers | | Karaoke Fill | Progressive fill across words | Music, voiceover, lyric-style captions | | Typewriter | Characters appear progressively | Dramatic storytelling | | Bounce In | Words move/scale from below | Shorts/Reels emphasis beats |

Timing and Readability Rules

  • Word-level animations usually need 80-250ms appear time and 200-600ms dwell, depending on platform.
  • Keep 3-6 words on screen for vertical social video.
  • Use large sans-serif fonts, high contrast, and a thick outline.
  • Avoid excessive shake/flash; keep accessibility and readability ahead of novelty.
  • Keep captions inside mobile safe zones; avoid the lower UI-heavy region.

Reference Map

  • references/caption-styles-and-generation.md - Full preserved reference: Whisper timestamp commands, ASS structure, WordPop/Sweep/Karaoke/Typewriter/Bounce examples, Python JSON-to-ASS script, bash pipeline, burn commands, style presets, color schemes, emoji integration, platform guidelines, troubleshooting, spring/easing/shake/pulse formulas, accessibility guidance, sources.

Related Skills

  • ffmpeg-captions-subtitles - Subtitle fundamentals and burn-in
  • ffmpeg-karaoke-animated-text - ASS karaoke and animated text patterns
  • ffmpeg-animation-timing-reference - Timing units, easing, readability, sync
  • viral-video-platform-specs - Export specs and safe zones
  • viral-video-hook-templates - Hook and retention strategy