What are the recommended hook durations for TikTok and Reels?

For maximum impact, hook animations should be fast and dramatic, typically completing within 0.4 to 0.5 seconds at 60fps.

How do I calculate the 'd' parameter in FFmpeg zoompan?

The 'd' parameter is measured in frames. To calculate it, multiply your desired duration in seconds by the frame rate (e.g., 2 seconds at 30fps = 60 frames).

What is the difference between centiseconds and milliseconds in ASS subtitles?

Karaoke tags (\k) use centiseconds (1/100s), while animation tags (\t) and fade tags (\fad) use milliseconds (1/1000s). This skill provides precise conversion tables for both.

How fast should captions be for optimal readability?

The recommended default is 160-180 Words Per Minute (WPM) for average viewers, though accessibility standards may require 120-140 WPM.

FFmpeg & Subtitle Timing Reference

Name: FFmpeg & Subtitle Timing Reference
Author: JosiahSiegel

byJosiahSiegel

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Content Management

Provides definitive time unit references and optimal duration guidelines for FFmpeg filters and ASS/SSA subtitle animations.

About

This skill serves as a comprehensive technical guide for developers and video editors utilizing programmatic video generation. It disambiguates the confusing landscape of time units—resolving conflicts between FFmpeg's seconds, ASS's centiseconds, and animation milliseconds—while providing psychology-based recommendations for viewer engagement. It is particularly useful for optimizing high-performance video hooks for social media platforms like TikTok and Reels, ensuring precise frame-rate calculations and professional-grade caption readability.

Key Features

Disambiguation of ASS/SSA karaoke centiseconds and animation milliseconds.
Platform-specific timing profiles for TikTok, Shorts, and Instagram Reels.
Cross-reference tables for FFmpeg filter units (seconds vs. frames).
7 GitHub stars
Human perception thresholds and WPM-based caption readability standards.
Mathematical formulas for frame-rate based zoompan and transition calculations.

Use Cases

Calculating frame-exact durations for programmatic FFmpeg video transitions and zooms.
Synchronizing complex word-by-word karaoke animations with audio precisely.
Optimizing social media hooks to fit within the 1.3-second attention threshold.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add josiahsiegel/claude-plugin-marketplace ffmpeg-animation-timing-reference

For use in Claude.ai and ChatGPT

Download Skill

GitHub