Smelter

Smelter is a toolkit for real-time, low-latency, programmable video and audio composition. It lets developers combine media from different sources into a single video output, live stream, or interactive media experience. The project is useful for apps that need dynamic layouts, overlays, text, custom shaders, embedded websites, and live multimedia transformations. Smelter provides React components that make programmable composition easier to express in familiar UI code. It can support workflows such as livestreaming, video conferencing, broadcast tools, virtual events, live shopping, and custom media production systems. Its main value is giving developers a flexible composition engine for real-time media instead of forcing them into fixed video layouts or manual production tools.