Agent skill

Video Edit

Edit videos locally using ffmpeg. An agent skill from calesthio/OpenMontage.

AGPL-3.0Auto-check: notesMedia & Creative

Install Video Edit

skills CLI

$ npx skills add calesthio/OpenMontage --skill video-edit -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install calesthio/OpenMontage video-edit --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/calesthio/OpenMontage.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/video-edit .claude/skills/video-edit && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "video-edit" agent skill from https://github.com/calesthio/OpenMontage/tree/main/.agents/skills/video-edit into .claude/skills/video-edit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "video-edit", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/calesthio/OpenMontage/tree/main/.agents/skills/video-edit

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add calesthio/OpenMontage --skill video-edit -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install calesthio/OpenMontage video-edit --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/calesthio/OpenMontage.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/video-edit .agents/skills/video-edit && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "video-edit" agent skill from https://github.com/calesthio/OpenMontage/tree/main/.agents/skills/video-edit into .agents/skills/video-edit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "video-edit", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add calesthio/OpenMontage --skill video-edit -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install calesthio/OpenMontage video-edit --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/calesthio/OpenMontage.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/video-edit .cursor/skills/video-edit && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "video-edit" agent skill from https://github.com/calesthio/OpenMontage/tree/main/.agents/skills/video-edit into .cursor/skills/video-edit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "video-edit", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/calesthio/OpenMontage.git --path .agents/skills/video-edit

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add calesthio/OpenMontage --skill video-edit -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install calesthio/OpenMontage video-edit --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/calesthio/OpenMontage.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/video-edit .gemini/skills/video-edit && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "video-edit" agent skill from https://github.com/calesthio/OpenMontage/tree/main/.agents/skills/video-edit into .gemini/skills/video-edit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "video-edit", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install calesthio/OpenMontage video-edit

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add calesthio/OpenMontage --skill video-edit -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/calesthio/OpenMontage.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/video-edit .github/skills/video-edit && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "video-edit" agent skill from https://github.com/calesthio/OpenMontage/tree/main/.agents/skills/video-edit into .github/skills/video-edit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "video-edit", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add calesthio/OpenMontage --skill video-edit -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install calesthio/OpenMontage video-edit --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/calesthio/OpenMontage.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/video-edit .opencode/skills/video-edit && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "video-edit" agent skill from https://github.com/calesthio/OpenMontage/tree/main/.agents/skills/video-edit into .opencode/skills/video-edit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "video-edit", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: video-edit
GitHub stars: 66k
Token cost: ~855 tokens
SKILL.md length: 130 words
Files: 2 (incl. references)
Skills in repo: 41
Repo updated: Oct 3, 2026
First seen: Oct 7, 2026
Licence: AGPL-3.0

At a glance

Edit videos locally using ffmpeg. An agent skill from calesthio/OpenMontage.

Cutting video segments
SKILL.md covers Prerequisites, Quick Reference, Platform Presets and Tips
Calls ffmpeg, apt and ffprobe
Concatenating multiple clips

What it does

Video Edit is an agent skill from calesthio/OpenMontage. 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.

Its SKILL.md is about 860 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/operations.md`).

It sits in Media & Creative, covering Video production. It works with FFmpeg. The repository describes itself as: World's first open-source, agentic video production system. 12 production pipelines, 100+ tools, 700+ agent skill and production-knowledge files. Turn your AI coding assistant… The licence is AGPL-3.0.

When your agent uses it

Cutting video segments
Concatenating multiple clips
Resizing video for social platforms
Replacing audio

Example prompts

“/video-edit”

What it can do on your machine

Read from SKILL.md and the folder at commit 9327439. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
- ffmpeg
- apt
- ffprobe
- brew
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Video Edit loads about 855 tokens when it runs, and up to ~3.2k if it reads all its reference files. Until then it costs about 89 tokens; SKILL.md has 130 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~89
When it runs · the whole SKILL.md, loaded when a task matches: ~855
With references · SKILL.md plus every file in references/, read only if the agent opens them: ~3.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

NoteRuns commands with sudoSKILL.md:22

sudo apt update && sudo apt install -y ffmpeg

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from calesthio/OpenMontage at commit 9327439, republished under its AGPL-3.0 licence (© calesthio). 130 words, ~855 tokens.

Download SKILL.mdSave it as .claude/skills/video-edit/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.

name: video-edit
description: 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.

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

Platform	Resolution	Scale + pad filter
TikTok	1080 x 1920	`scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:(ow-iw)/2:(oh-ih)/2:black`
YouTube	1920 x 1080	`scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2:black`
Instagram	1080 x 1350	`scale=1080:1350:force_original_aspect_ratio=decrease,pad=1080:1350:(ow-iw)/2:(oh-ih)/2:black`
Square	1080 x 1080	`scale=1080:1080:force_original_aspect_ratio=decrease,pad=1080:1080:(ow-iw)/2:(oh-ih)/2:black`
Twitter/X	1920 x 1080	`scale=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.

Files

SKILL.md and 1 other file (references) in .agents/skills/video-edit of calesthio/OpenMontage.

SKILL.md
references/operations.md

Open the folder on GitHubat commit 9327439

Compare with similar skills

Video Edit next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Video Edit compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Video Edit this skillcalesthio/OpenMontage	66k	—	~855	Automated safety check: Notes	AGPL-3.0	6 days ago
HyperFrames Video Entry Pointheygen-com/hyperframes	59k	3 repos	~5.2k	Automated safety check: Pass	Apache-2.0	today
Video Shotseternityspring/reelbench-skills	872	1 repos	~1.8k	Automated safety check: Notes	Apache-2.0	18 days ago
Mobile Demo Film Editorsuperset-sh/superset	15k	—	~1.8k	Automated safety check: Pass	Custom licence	today
Lemo-Opuscar Short Film Directorlemomo-ai/lemo-opuscar	1.4k	—	~596	Automated safety check: Pass	Custom licence	yesterday
Karaoke CaptionsAI-Builder-Club/skills	1.3k	—	~850	Automated safety check: Pass	None	24 days ago

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Questions about Video Edit

What does Video Edit do?

Edit videos locally using ffmpeg. An agent skill from calesthio/OpenMontage. Video Edit is an agent skill from calesthio/OpenMontage. Edit videos locally using ffmpeg.

When should I use Video Edit?

Video Edit fits situations like: cutting video segments; concatenating multiple clips; resizing video for social platforms; replacing audio.

How do I install Video Edit in Claude Code?

Run `npx skills add calesthio/OpenMontage --skill video-edit -a claude-code`. Or copy the skill folder (.agents/skills/video-edit in calesthio/OpenMontage) into .claude/skills/video-edit in your project. Claude Code loads it when a task matches its description.

How do I install Video Edit in Codex?

Run `npx skills add calesthio/OpenMontage --skill video-edit -a codex`. Or copy the skill folder (.agents/skills/video-edit in calesthio/OpenMontage) into .agents/skills/video-edit in your project. Codex loads it when a task matches its description.

Can I use Video Edit in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add calesthio/OpenMontage --skill video-edit -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/video-edit, .gemini/skills/video-edit, .github/skills/video-edit and .opencode/skills/video-edit in your project.

What does Video Edit need to run?

Going by SKILL.md and its folder, Video Edit needs the command-line tools its instructions call (ffmpeg, apt, ffprobe and brew).

Does Video Edit access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Video Edit safe to install?

Our automated static check of SKILL.md found notes only (runs commands with sudo), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Video Edit use?

Video Edit is published under the AGPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Video Edit use?

About 855 tokens (SKILL.md is roughly 3.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 2.3k tokens, read only when the agent opens those files.

What are the alternatives to Video Edit?

Skills that share tags, products or a category with Video Edit: HyperFrames Video Entry Point (heygen-com/hyperframes, 59k stars), Video Shots (eternityspring/reelbench-skills, 872 stars), Mobile Demo Film Editor (superset-sh/superset, 15k stars) and Lemo-Opuscar Short Film Director (lemomo-ai/lemo-opuscar, 1.4k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Video Edit?

calesthio (a GitHub user) maintains it in calesthio/OpenMontage, which has 65,614 GitHub stars. The repository holds 41 skills in this directory. The repository was last updated on October 3, 2026.

Source: calesthio/OpenMontage on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Video Edit

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Video Edit

Prerequisites

Quick Reference

Get video info

Trim

Concatenate clips

Resize for platform

Change speed

Extract audio

Replace audio

Compress

Convert format

Add image overlay

Platform Presets

Tips

Files

Compare with similar skills

Similar skills

More from calesthio/OpenMontage

Related

Questions about Video Edit