web-video

82 / 100 · Low risk

Fine to try.

By evilmartians/agent-skills (GitHub) · media · 65 stars · scanned at commit b964cf1

Encode a video for the web with a bundled ffmpeg script: AV1 and H.264 MP4s plus a JPEG poster for ordinary video, with HEVC on request, or VP9 WebM and HEVC with alpha plus a PNG poster for transparent video, picked from the source automatically. Use when the user wants to optimize, compress, or convert a video, screencast, screen recording, GIF, or animated cover for a website, blog, docs, or landing page; make a video smaller or load faster; replace a GIF with video; add an autoplaying backg…

Works with any agent that supports SKILL.md skills.

What this skill can do

Runs commands on your computer

This is disclosed by the author in the skill's SKILL.md or README.

Found in 2 places.

skills/web-video/SKILL.md, line 17bash <skill-dir>/scripts/web-video.sh [options] <video>
skills/web-video/SKILL.md, line 35--opaque-formats av1,hevc,h264

Downloads and installs other software

The author does not mention this.

Found in 3 places.

skills/web-video/SKILL.md, line 43**The script checks its requirements before encoding anything** and names what's missing: ffmpeg with SVT-AV1, x264, and libvpx-vp9, x265 only when HEVC is requ
skills/web-video/scripts/web-video.sh, line 111die "This ffmpeg build lacks $1, needed for $2. Install one that has it (brew install ffmpeg on macOS) or leave $2 out with --formats."
skills/web-video/scripts/web-video.sh, line 209die "ffmpeg is not installed: brew install ffmpeg on macOS, or see https://ffmpeg.org/download.html"

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'web-video' ] || [ -L ~/.agents/skills/'web-video' ]; then echo 'A skill folder named web-video already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/evilmartians/agent-skills' "$d" && git -C "$d" checkout --quiet 'b964cf1b164bd0a81019fb54fcb11a7dcec522d4' -- 'skills/web-video' && mkdir -p ~/.agents/skills && cp -R "$d"/'skills/web-video' ~/.agents/skills/'web-video' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'web-video' ~/.claude/skills/'web-video' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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Score history

Date	Version	Score
2026-11-07	`b964cf1`	82