Video extraction

Skill cxcscmu/SkillLearnBench/skills/b4-skill-creator-gemini-3-flash-preview/video-object-counting/video-extraction

Use this skill to extract keyframes from video files using FFmpeg. It covers selecting the right extraction frequency and naming conventions for image sequences.From its SKILL.md

Install

npx -y skills add cxcscmu/SkillLearnBench --skill video-extraction

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

SKILL.md

1.0 KB, 211 tokens by cl100k_base, as published. Nobody here has run it

Video Extraction Skill

This skill provides instructions for extracting keyframes from video files (e.g., MP4) using ffmpeg.

Prerequisites

ffmpeg must be installed in the environment.

Extraction Commands

To extract keyframes from a video file:

ffmpeg -i input_video.mp4 -vf "select='eq(pict_type,PICT_TYPE_I)'" -vsync vfr output_prefix_%03d.png

-i input_video.mp4: Specifies the input video file.
-vf "select='eq(pict_type,PICT_TYPE_I)'": Filters for I-frames (keyframes).
-vsync vfr: Variable frame rate, ensures only selected frames are output.
output_prefix_%03d.png: The output filename pattern.

Naming Convention

For this task, use the following pattern: /root/keyframes_%03d.png

Verification

After extraction, list the files in the output directory to confirm they were created.

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.