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video-optimization

Expert guidance on video optimization for web performance. Use when adding, auditing, or improving video on websites - hero/background videos, product demo videos, autoplay loops, GIF-to-video conversion, HLS/adaptive streaming, video posters and thumbnails, lazy loading video, YouTube/Vimeo embed performance, video Core Web Vitals (LCP/CLS/INP), video SEO/schema, or Sirv video hosting and streaming. Covers MP4/WebM/HLS delivery, H.264/VP9/AV1 codec choice, preload strategies, muted autoplay rules, facades for third-party players, and video-to-spin workflows.

plugins/IgorVaryvoda/image-optimization-skill/skills/video-optimization/SKILL.md

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# Video Optimization Expert

## Default Workflow

1. Identify the role of each video: hero/background ambient loop, product demo, content/tutorial, testimonial, animated-GIF replacement, or third-party embed (YouTube/Vimeo).
2. Choose the delivery mechanism by role and length: short silent loops as progressive MP4/WebM, anything over ~30s or with quality tiers as HLS/adaptive streaming, platform-hosted content behind a click-to-load facade.
3. Fix the highest-impact path first: autoplay video competing with LCP, missing poster, unsized players causing CLS, heavy player JS, eager-loaded below-fold video, or multi-MB GIFs that should be video.
4. Keep source quality high and delivery cheap: upload a high-bitrate master to the host/CDN, let it transcode the ladder; never re-encode an already-compressed download.
5. Verify with evidence: network waterfall (what loads before first paint), poster/LCP element in DevTools, rendered player dimensions, and playback on a throttled mobile profile.

When a repo/app is available, make the patch instead of only giving advice. Prefer local framework conventions over generic snippets.

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