AVMatrix HVS0403U Micro 4-Channel SDI & HDMI Video Switcher

AVMatrix HVS0403U: Compact 4-Channel Live Production Switcher

The AVMatrix HVS0403U is a micro 4-channel SDI & HDMI video switcher, mixing 2x HDMI + 2x 3G-SDI inputs at up to 1080p60 in a metal case small enough to travel. It gives a small team the core of a live-production control room: multi-source switching, transitions, keying and monitoring in one box. A USB Type-C output turns it into a plug-and-play camera for streaming software. For churches, schools and event crews, it makes professional multi-camera video approachable and portable.

How a Video Switcher Handles Sources and Transitions

Seamless or effect-based switching means the unit fully processes each source so transitions cut or dissolve cleanly instead of glitching or going black. The HVS0403U offers T-bar, AUTO and CUT control with MIX, FADE and WIPE effects, and a preview/program workflow so an operator sets up the next shot before taking it live. Each of the four inputs is scaled and synchronized internally, avoiding the roll or flash that happens when mismatched signals are switched raw. That processing is what separates a real production switcher from a simple A/B selector.

Inputs, Multiview and USB-C Capture

The switcher accepts 2x HDMI + 2x 3G-SDI, auto-detecting resolution and frame rate, and outputs dual HDMI program feeds plus an HDMI multiview that displays every input, preview and program on a single monitor. Its USB Type-C output is UVC-compliant, so a computer sees it as a standard webcam for OBS, vMix, Zoom or Teams with no drivers. On the SDI inputs, 3G-SDI carries locked, uncompressed 1080p60 over long coax for cameras placed far from the switcher. Per-output scaling keeps every destination at the resolution it needs.

Keying, Overlays and Audio Mixing

Luma and chroma keying let the switcher drop a background out of a source, so a presenter shot on green screen composites over a slide or scene in real time; a downstream keyer (DSK) and PIP/POP layouts add logos, lower thirds and picture-in-picture. An onboard audio mixer blends a 3.5mm microphone, RCA or line input and HDMI embedded audio into the program, so sound and picture stay together. GPIO tally drives on-air lights to cameras, and LAN PC software gives deeper control. Everything a small live show needs sits on one panel.

Who the HVS0403U Is For

This switcher fits houses of worship, schools, corporate AV, and event and streaming crews that run two to four cameras and want production polish without a rack of gear. Its USB-C capture suits producers who drive the stream from OBS, vMix or Zoom on a laptop. The mixed SDI and HDMI inputs suit venues combining long-run SDI cameras with local HDMI sources. Compact and metal-built, it travels easily between rooms and venues. It is a dependable core for approachable multi-camera production.