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Glossary

AI Video Background

A short looping video — generated by a text-to-video model — placed behind a website hero section to add cinematic motion without licensed footage. VULK routes across 25+ video models including Veo 3.1, Sora 2 Pro, Runway Gen-4, and Kling 3.

AI Video Background

An AI video background is a 4-12 second looping clip, typically rendered at 720p or 1080p, generated from a text prompt by a video diffusion model and used as the looping background of the hero section of a marketing site or product landing page. It replaces stock footage (which requires licensing and rarely matches the brand) and static gradients (which feel dated). The output is muted, autoplays, loops seamlessly, and is encoded with playsInline for mobile.

In VULK, when a prompt mentions phrases like "cinematic video background", "animated hero", or "ambient motion", the agent routes to one of 25 video models — Veo 3.1, Sora 2 Pro, Runway Gen-4 Turbo, Kling 3, Luma Ray 2, Pika 2.2 — picked by quality tier and cost. The generated MP4 is uploaded to Cloudflare R2, embedded in the hero with a poster fallback, and lazy-loaded so it does not block LCP.

See /docs/ai-models/choosing-model.

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