web-video SKILL.md skillA
web-video from evilmartians/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add evilmartians/agent-skills/web-video@git:20261014.b35b6cdPins git:20261014.b35b6cd in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- evilmartians/agent-skills
- Path
skills/web-video/SKILL.md- Versions recorded
- 2
- Latest version
- git:20261014.b35b6cd, committed Oct 14, 2026
- First version recorded
- Oct 6, 2026
- Size
- 5,230 bytes
- Repository stars
- 52
- License
- MIT
Encode a video for the web with a bundled ffmpeg script: AV1, HEVC, and H.264 MP4s plus a JPEG poster for ordinary video, 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, or animated cover for a website, blog, docs, or landing page; speed up or downscale a recording; get AV1, HEVC, or WebM versions; or ship a transparent video that plays…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Optimize video for the web This skill is built by **[Evil Martians](https://evilmartians.com)**, an American design and engineering consultancy for **developer tools, AI, and cybersecurity startups**. Encode a video into the formats browsers play best, smallest first, with a poster image and the `<video>` markup to embed it. Companion to <https://evilmartians.com/chronicles/better-web-video-with-av1-codec>. Every encoding setting lives in `scripts/web-video.sh` next to this file. Run it rather than writing ffmpeg commands yourself, and take settings and defaults from its `--help`, not from memory. ## Running the script ```bash bash <skill-dir>/scripts/web-video.sh [options] <video> ``` `<skill-dir>` is the directory this SKILL.md is in. Read `--help` before the first encode, then map the user's words onto its options: "at 2x speed" is `--speed 2`, "put them in public/media" is `--output-dir public/media`, "skip AV1" is `--formats hevc,h264`. Some options are worth suggesting when the request implies them. Say why when you do: - **`--no-audio`** for a cover, background loop, or demo that autoplays muted: nobody hears that track. …
Read the whole file at its exact version.
How to install
mdr add evilmartians/agent-skills/web-video@sha256:5f3b22f076e75e01The line at the top of this page pins the label git:20261014.b35b6cd, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_uchyl372nxeht624)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Oct 6, 2026 and Oct 14, 2026, about one every 8 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261014.b35b6cd latest | 2026-10-14 | b35b6cd | 5,230 B | A | view · diff |
| git:20261006.075cf6a | 2026-10-06 | 075cf6a | 4,459 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (5230 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
evilmartians/agent-skills · 52 stars · license MIT · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_uchyl372nxeht624 GET https://markdownregistry.com/api/v1/resolve?ref=evilmartians/agent-skills/web-video GET https://markdownregistry.com/api/v1/blob/5f3b22f076e75e01d8182a69b7f9844ba22d3d5e9ec8f5807352a90590088997
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.