Video Edit

calesthio/OpenMontage/.claude/skills/video-edit

by calesthio9327439db69021ab4b0e2776729bf3b58fdb5a87No license65K starsListed Oct 9, 2026Updated Oct 9, 2026Repository updated 5 days ago

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.

Instructions onlyDesign & Creative
AI-generated overview

Edits video files locally with ffmpeg commands for trimming, joining, resizing, audio and format conversion.

What it does
This skill provides ffmpeg and ffprobe command recipes for local video editing. It covers inspecting video metadata, trimming segments, concatenating clips, resizing and padding for platform presets, changing playback speed, extracting or replacing audio, compressing, converting formats, and adding image overlays. It produces edited video or audio files and includes a reference document with more detailed recipes and flag explanations.
When to use it
Use it when you need to cut or join video clips, resize video for social platforms, extract or replace audio tracks, compress or convert video formats, or read video information. It suits local command-line video editing tasks where ffmpeg is available.
Requirements
Requires ffmpeg and ffprobe installed locally (for example via Homebrew or apt). No wrapper scripts are shipped; the skill contains instructions and a reference document only.

Video Edit

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

Prerequisites

Install ffmpeg (includes ffprobe):

bash
# macOSbrew install ffmpeg
# Ubuntu/Debiansudo apt update && sudo apt install -y ffmpeg
# Verifyffmpeg -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 listprintf "file '%s'\n" clip1.mp4 clip2.mp4 clip3.mp4 > list.txt
# 2. Concat with stream copyffmpeg -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 fasterffmpeg -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 cornerffmpeg -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.

Source and attribution

Source:calesthio/OpenMontagein.claude/skills/video-editat commit9327439

License: No license

Content belongs to its original authors. SourceWeft indexes it from a public repository.

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