gabrielmoreira/agent-skills-mirror/video-edit

Claude Code and agent skill by gabrielmoreira/agent-skills-mirror

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Edit videos locally using ffmpeg. Trim, concat, resize, speed, overlay, extract audio, compress, and convert. Use when: (1) Trimming or cutting video segments, (2) Concatenating multiple clips, (3) Resizing video for social platforms, (4) Extracting or replacing audio, (5) Compressing video, (6) Converting video formats, (7) Getting video info.

Install

npx vskill@latest install gabrielmoreira/agent-skills-mirror/video-edit

SKILL.md

Video Edit

Edit videos locally by running ffmpeg/ffprobe directly. No wrapper scripts needed.

Prerequisites

Install ffmpeg (includes ffprobe):

bash
# macOS
brew install ffmpeg
 
# Ubuntu/Debian
sudo apt update && sudo apt install -y ffmpeg
 
# Verify
ffmpeg -version && ffprobe -version

Quick Reference

Get video info
bash
ffprobe -v quiet -print_format json -show_format -show_streams video.mp4
Trim
bash
ffmpeg -y -ss 00:00:30 -to 00:01:45 -i video.mp4 -c copy trimmed.mp4
Concatenate clips
bash
# 1. Create a file list
printf "file '%s'\n" clip1.mp4 clip2.mp4 clip3.mp4 > list.txt
 
# 2. Concat with stream copy
ffmpeg -y -f concat -safe 0 -i list.txt -c copy joined.mp4
Resize for platform
bash
ffmpeg -y -i video.mp4 \
  -vf "scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:black" \
  -c:a copy tiktok.mp4
Change speed
bash
# 2x faster
ffmpeg -y -i video.mp4 -filter:v "setpts=0.5*PTS" -filter:a "atempo=2.0" fast.mp4
 
# 0.5x (slow motion)
ffmpeg -y -i video.mp4 -filter:v "setpts=2.0*PTS" -filter:a "atempo=0.5" slow.mp4
Extract audio
bash
ffmpeg -y -i video.mp4 -vn -acodec libmp3lame audio.mp3
Replace audio
bash
ffmpeg -y -i video.mp4 -i audio.mp3 -c:v copy -map 0:v:0 -map 1:a:0 -shortest output.mp4
Compress
bash
ffmpeg -y -i video.mp4 -crf 23 -preset medium -c:a copy compressed.mp4
Convert format
bash
ffmpeg -y -i video.mov output.mp4
Add image overlay
bash
# Logo in top-right corner
ffmpeg -y -i video.mp4 -i logo.png \
  -filter_complex "overlay=W-w-10:10" -c:a copy watermarked.mp4

Platform Presets

PlatformResolutionScale + pad filter
TikTok1080 x 1920scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:black
YouTube1920 x 1080scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2:black
Instagram1080 x 1350scale=1080:1350:force_original_aspect_ratio=decrease,pad=1080:1350:(ow-iw)/2:(oh-ih)/2:black
Square1080 x 1080scale=1080:1080:force_original_aspect_ratio=decrease,pad=1080:1080:(ow-iw)/2:(oh-ih)/2:black
Twitter/X1920 x 1080scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2:black

Use the filter with: ffmpeg -y -i input.mp4 -vf "<filter>" -c:a copy output.mp4

Tips

  • Always use -y to overwrite output without prompting.
  • Use -c copy when you only need to cut/join (no re-encoding, very fast).
  • Lower CRF = better quality, larger file. Range 18-28 is typical; 23 is the default.
  • For detailed recipes and flag explanations, see references/operations.md.

Security

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  • Model reviewPassed

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