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Run2 ffmpeg extraction

Skill cxcscmu/SkillLearnBench/skills/b2-self-feedback-gemini-3-flash-preview/video-object-counting/run2_ffmpeg_extraction

Advanced FFmpeg techniques for keyframe extraction with quality control.From its SKILL.md

Install
npx -y skills add cxcscmu/SkillLearnBench --skill run2_ffmpeg_extraction

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

SKILL.md

0.9 KB, 216 tokens by cl100k_base, as published. Nobody here has run it

Advanced FFmpeg Keyframe Extraction

Extract only the keyframes (I-frames) from a video. This is much faster than extracting every frame and provides the most significant images.

Basic Usage

ffmpeg -i input.mp4 -vf "select='eq(pict_type,I)'" -vsync vfr output_%03d.png

Quality Control

If you need high quality JPEGs instead of PNGs:

ffmpeg -i input.mp4 -vf "select='eq(pict_type,I)'" -vsync vfr -q:v 2 output_%03d.jpg

(where -q:v 2 is high quality, range 1-31).

Parameters Explained

  • -vf "select='eq(pict_type,I)'": Filters for Intra-coded frames (keyframes).
  • -vsync vfr: Variable Frame Rate, ensures we don't get duplicate frames if keyframe intervals vary.
  • output_%03d.png: Standard printf-style naming for sequences.

What ships with it

Read from the repository

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

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