Video extraction

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

[COLM'26] SkillLearnBench is the first benchmark for evaluating continual learning methods that automatically generate agent skills.

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.

What its author says it does

Copied from the file, not written here

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

SKILL.md

1.0 KB, 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.