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Run2 ffmpeg keyframes

Skill cxcscmu/SkillLearnBench/skills/b2-self-feedback-claude-opus-4-6/video-object-counting/run2_ffmpeg-keyframes

Extract I-frame keyframes from video files using FFmpeg, with output verification and naming conventions.From its SKILL.md

Install
npx -y skills add cxcscmu/SkillLearnBench --skill run2_ffmpeg-keyframes

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

SKILL.md

0.8 KB, 173 tokens by cl100k_base, as published. Nobody here has run it

FFmpeg Keyframe Extraction

Command

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

Key Details

  • Output numbering starts at 001 (not 000)
  • -vsync vfr prevents duplicate frames
  • %03d gives zero-padded 3-digit numbering
  • Frame count depends on encoding; check output to know total frames

Verification

After extraction, verify frame count:

ls /root/keyframes_*.png | wc -l

Notes

  • For Super Mario gameplay video (~27 seconds), expect ~8 keyframes
  • PNG format is lossless, ideal for subsequent template matching
  • Frames are in timeline order by default

What ships with it

Read from the repository

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

Keep looking

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