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Real-time video compositing software

Low-latency multimedia composition
for your live streams and pre-recorded videos

The only video
compositing software you need

Ultra-low latency

Compose and stream your videos with minimal delay. Smelter means seamless experience for use cases that demand immediate responsiveness.

Multi-source support

Combine live feeds, screen recordings, and pre-recorded videos into a single composition. Mix multiple inputs at the same time without any frame drops.

Dynamic overlays

Add text, animations, transitions, and graphics seamlessly — both to live and to recorded videos. Change layouts on the fly.

Browser-based experience

Run high-performance video processing directly in the browser with WASM. Also, leverage GPU processing by rendering with WebGL or WebGPU.

Simple API

Thanks to the declarative API, Smelter is quick to pick up for anyone familiar with web development. Which means you can customize it in no time.

Tech-stack flexibility

You can use Smelter with TypeScript (React), Elixir (Membrane Framework) or just HTTP API with any language. Also, you need no deep video expertise.

Easy deployment

We provide pre-built binaries and publish images to the Docker registry. This way, you can set up Smelter in just a few steps.

Offline processing available

It’s not only about real-time streaming. With Smelter, you can also process data offline and then save the result as a file.

Choose your plan

Free

For hobbyists and
small-to-medium projects

Offline processing: Unlimited

Live processing:

Up to 50 employees
Up to 10k viewers
Up to 50 machines

Enterprise

For enterprise-grade applications

Offline processing: Unlimited

Live processing: Unlimited

Priority support: Custom integrations, new features, long-term support

Free trial for 90 days (no credit card required, no strings attached)

Set up Smelter the way you want

React / TypeScript

React is a powerful library for building dynamic user interfaces — leverage its benefits to seamlessly compose video. Or manage your Smelter instance directly with our TypeScript SDK.

Membrane plugin

Membrane is a developer-friendly multimedia framework for Elixir. With its use, you can easily integrate video and audio mixing into your multimedia pipeline using the Membrane Smelter plugin.

Standalone server

You can deploy Smelter as a standalone server, locally or in the cloud. Its language-agnostic API will integrate easily with your solutions, and our Docker images, coupled with proper deployment guides, will make the setup effortless.

One toolkit, many use cases

Live-streaming

Compose and mix video streams in real time with ultra-low latency. Supports live and pre-recorded inputs, overlays, and transitions.

Broadcasting

Seamlessly blend multiple video sources for professional broadcasts. Leverage GPU-powered rendering and hardware decoding.

Video conferencing

Stream or record with real-time compositing, multi-camera setups, and dynamic overlays. Perfect for interactive webinars and meetings.

What our users say about Smelter

“We currently use this in one of our current production apps and the capabilities of it are fantastic.
Quite a pragmatic toolkit to use and would definitely recommend it to anyone interested in doing real-time A/V.
The best toolkit to use in Elixir for sure.”

Deric Walintukan Senior Engineering Manager at Firework

Do you want to use
Smelter?

Tell us about your needs and we’ll get back to you in 48 hours