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jholhewresjholhewres/devclaw-skills/skills/ffmpeg/SKILL.md

ffmpeg

Skill4 starsChanged 9 months agoMITView on GitHub

Video and audio processing with ffmpeg

  • Installs packages

We split this skill into the rules it gives an agent

4 rules. 0 are common, 4 are distinctive, and 0 are very specific to this project.

  • 0

    Common

    Most of the 22 edited versions we read keep these.

  • 4

    Distinctive

    This author's own choices. Worth a look.

  • 0

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Use the bash tool with ffmpeg for media processing.

    line 7
  2. Distinctive:

    Use -c copy for fast operations without re-encoding

    line 57
  3. Distinctive:

    Use -crf for quality (lower = better, 18-28 is good range)

    line 58
  4. Distinctive:

    Always check output with ffprobe

    line 59

“Common” is measured: kept by at least 6 in 10 of the 22 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

FFmpeg

Use the bash tool with ffmpeg for media processing.

Setup

# Check if installed
command -v ffmpeg && command -v ffprobe

# Install — macOS
brew install ffmpeg

# Install — Ubuntu/Debian
sudo apt install ffmpeg

Info

ffprobe -v quiet -print_format json -show_format -show_streams <input>

Convert

ffmpeg -i input.mp4 -c:v libx264 -crf 23 -preset medium output.mp4
ffmpeg -i input.mp4 -vn -acodec libmp3lame -q:a 2 output.mp3
ffmpeg -i input.webm -c:v libx264 output.mp4

Trim & Cut

ffmpeg -i input.mp4 -ss 00:01:00 -t 00:00:30 -c copy output.mp4

Resize

ffmpeg -i input.mp4 -vf "scale=1280:720" output.mp4
ffmpeg -i input.mp4 -vf "scale=-1:720" output.mp4   # maintain aspect ratio

Audio

ffmpeg -i input.mp4 -vn -acodec copy audio.aac
ffmpeg -i audio.wav -acodec libmp3lame -b:a 192k output.mp3

GIF

ffmpeg -i input.mp4 -vf "fps=10,scale=480:-1:flags=lanczos" -c:v gif output.gif

Tips

  • Use -c copy for fast operations without re-encoding
  • Use -crf for quality (lower = better, 18-28 is good range)
  • Always check output with ffprobe

Download now (ZIP)

  • Other versions24 projects use a version of this.

    Word for word · 0

    None found.

    Edited · 0

    None found.

    Wrote their own version · 24

    1. calesthio/OpenMontage★ 74ksame name
    2. digitalsamba/claude-code-video-toolkit★ 2.4ksame name
    3. rendi-api/ffmpeg-cheatsheet★ 1.7ksame name
    4. edenfunf/reelmimic★ 311same name
    5. Hainrixz/editor-pro-max★ 279same name
    6. magnus919/agent-skills★ 162same name
    7. LinHao-city/StoryMind★ 10same name
    8. n0an/ffmpeg-skill★ 8same name
    9. badgids/Story-Film-Skills★ 4same name
    10. Roentek/Claude_Code_Boilerplate_Framework★ 4same name

    14 more not listed

    How matches are found. Word for word: the exact same text. Edited: shares passages with this file (“99% same” means 99% of its five-word phrases also appear here; 10% or more counts). Their own version: similar meaning, or, weakest, the same name. We can’t tell which project had it first. Projects are counted among the 200 most-starred candidates, and mentions are links to the repository we found, up to 50 per site, so both counts are a floor.

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