Video keyframe extraction

Skill cxcscmu/SkillLearnBench/skills/b4-skill-creator-claude-opus-4-6/video-object-counting/video-keyframe-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-keyframe-extraction

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What its author says it does

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Extract key frames (I-frames) from video files using FFmpeg. Use this skill when the user needs to pull out keyframes from MP4, MKV, AVI, or other video formats for analysis or processing.

SKILL.md

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Video Keyframe Extraction

Extract I-frames (keyframes) from video files using FFmpeg's select filter.

Command

ffmpeg -i <input_video> -vf "select=eq(pict_type\,I)" -vsync vfr <output_pattern>

-vf "select=eq(pict_type\,I)" selects only I-frames (intra-coded frames, the "key" frames in video compression)
-vsync vfr uses variable frame rate to avoid duplicating frames
Output pattern uses %03d for sequential numbering: e.g., keyframes_%03d.png

Example

ffmpeg -i /root/video.mp4 -vf "select=eq(pict_type\,I)" -vsync vfr /root/keyframes_%03d.png

This produces /root/keyframes_001.png, /root/keyframes_002.png, etc., one per I-frame in timeline order.

Notes