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video-optimization

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Use when reviewing <video> elements, background/hero video, or embedded media assets. Check encoded bitrate, resolution relative to the rendered player size, codec/container choice, and whether a poster/thumbnail avoids blocking on the first frame.

skills/video-optimization/SKILL.md

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Oct 31, 2026
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MIT

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# Optimize and compress web videos

Unoptimized video is frequently the single heaviest asset on a page—an uncompressed or oversized video can dwarf every image and script combined, delaying Largest Contentful Paint and burning mobile data budgets.

## Quick Reference

- Re-encode source video instead of shipping raw camera/screen-recorder output
- Serve multiple resolutions so mobile doesn't download a 4K file
- Prefer modern codecs: AV1/VP9/HEVC over baseline H.264 where supported
- Strip audio tracks from silent background/looping videos

## Check

Scan this codebase for <video> elements and video asset references. For each one, verify: 1) The served resolution is appropriate for the rendered player size and device (no 4K video in a 400px player). 2) The codec/container is efficient (H.264 baseline is acceptable but VP9/AV1/HEVC is preferred when available). 3) Audio is stripped from silent background/looping videos. 4) A poster attribute or lightweight thumbnail is present. 5) File size is reasonable for its duration and placement (hero/background videos under a few MB). Report issues grouped by severity with file paths.
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