HTML in, MP4 out: rendering a video with HyperFrames instead of an editor

Originally published on dhseadev.online.

I did not open a video editor to make this. I described a video, and the agent stack I run every day rendered one.

That is a 13-second vertical short about how many items in a Dota 2 inventory are actually sellable. Every frame of it came out of an HTML file.

What HyperFrames is

HyperFrames is HeyGen's open-source HTML-to-MP4 renderer. Apache 2.0, Node 22+, FFmpeg on PATH. Its README is basically three sentences: write HTML, render video, built for agents.