Virtual time engine to record HTML to 60fps MP4, no drops
Details
- External ID
- 49057621
- Source
- HN
- Company
- —
- Product
- Virtual time engine to record HTML to 60fps MP4, no drops
- Website domain
- zlvox.com
- Launched
- July 26, 2026
- Cohort
- —
- Upvotes
- 5
- Upvotes percentile
- 0.1081242532855436
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:26 p.m.
- Updated at
- Sept. 7, 2026, 9:26 p.m.
Enrichment
- Theme
- creative coding and visual experiments
- Vertical
- Media & entertainment
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Hobby / open-source project
- Normalized one-liner
- html to video rendering engine
- Manually corrected
- False
Could you build this?
Partial A website offering HTML-to-MP4 video conversion is simple, but building a virtual time deterministic rendering engine that intercepts browser animation ticks (requestAnimationFrame, CSS animations, Web Animations API) without frame drops is technically non-trivial.
What it would actually take: The engine uses headless Chromium (via Puppeteer/Playwright or CDP) injecting a custom virtual time override that monkey-patches `performance.now`, `Date.now`, `requestAnimationFrame`, and CSS animation timelines. It steps through time frame-by-frame, capturing raw pixel buffers (via CDP `Page.captureScreenshot` or screencast streams) and piping them into an FFmpeg encoder process.
Discussion
2 comments analyzed.
Competitors mentioned: webmotion.superhq.ai
Concerns raised: Browser not designed for time freezing, audio/video/CSS cannot be effectively paused, Virtual time engine concept similarity to existing product
Competitors
Other products that read as similar to this one — 326 launches clear the similarity bar, closest 8 shown.
Attention rank: #300 of 327 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 267 days after the earliest competitor.
- Rendering 18,000 videos in real-time with Python · hn · 2026-02-22 · 49 upvotes · similarity 0.54
- Shot-scraper video tool for recording YAML-defined webapp feature demos · hn · 2026-06-30 · 8 upvotes · similarity 0.48
- HyperFrames · hn · 2026-04-16 · 6 upvotes · similarity 0.48
- FastPlay, a Windows video player focused on speed and usability · hn · 2026-03-20 · 11 upvotes · similarity 0.47
- Got VACE working in real-time · hn · 2026-02-12 · 10 upvotes · similarity 0.47
- LightTwist - Record and stream in a realistic virtual studio, even if your guests and co-hosts are remote · yc · 2026-06-30 · 6 upvotes · similarity 0.47
- FastPlay, a fast minimal Windows video player built in Rust · hn · 2026-06-25 · 5 upvotes · similarity 0.47
- Openvid · hn · 2026-05-15 · 6 upvotes · similarity 0.47
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a dev tools tool for Sales yet.