io.github.konecz/kodecz

[!WARNING] Discontinued (November 12, 2026). Kodecz is no longer developed in this repository. The engine lives on, and keeps improving, inside Konectaz, the Konecz product: for the most up-to-date version, use Konectaz (konecz.com). This repository stays available as it is, under Apache-2.0, but receives no new features, fixes or security updates. Issues and pull requests are no longer reviewed.

Kodecz is an open-source video rendering engine that turns a web page into an MP4. You write the video in HTML, CSS and JavaScript (React, WebGL, GSAP, Lottie or nothing at all), and Kodecz renders it frame by frame on an NVIDIA GPU with NVENC or on any CPU with x264, without taking a screenshot of every frame. It is an alternative to Remotion and HyperFrames, made to be driven by AI agents.

Quick start · Write a video · How it works · Numbers · For AI agents · FAQ · Português

If Chromium can draw it, Kodecz can render it:

How it works

Two paths, one folder. Other tools take a screenshot of every frame and turn it into a PNG before encoding it; Kodecz never does, with or without a GPU.

Page is your index.html. Chromium draws frame N. On a GPU, that frame stays on the card as a texture; on the CPU, it is the raw frame Chromium just painted. Either way it goes straight to the encoder, NVENC on the card or x264 on the processor, and comes out as an MP4 with the audio mixed in. Frame N is always the same frame, in order, out of order or starting from the middle: same content, same timing.

Numbers

Each square is one second. Rendering the same video on the same day, Kodecz keeps the processor busy for 19× less time (37.7 s → 2.0 s of CPU) and hands you the MP4 3.7× sooner (9.9 s → 2.7 s on the clock).

_{1080p · 150 frames · H.264 · RTX 5090 · how we measured}

Against HyperFrames, measured on the same video and the same day: 11× less CPU (22.0 s → 2.0 s) and 2.4× sooner (6.4 s → 2.7 s) on

... View full README on GitHub