Magewell - Capture card vs hardware encoder: what's the actual difference?

This is the single most common point of confusion across our own range, so it's worth a straight answer — and one diagram, since the decision really only turns on one question.

A capture card (our USB Capture, Pro Capture and Eco Capture lines) gets video into a computer. It connects to an HDMI/SDI source on one side and to a PC over USB or PCIe on the other, and presents that signal to software — OBS, vMix, Teams, Zoom — as if it were a webcam. The computer does the actual streaming, recording or encoding; the card's job is purely getting a clean signal in. You need a capable PC, and that PC's performance and software setup directly determine your output quality.

A hardware encoder (our Ultra Encode and Pro Convert encoder lines) does the opposite: it's a standalone box that takes HDMI/SDI in on one side and outputs a network stream — NDI, SRT, RTMP — on the other, with no computer involved at all. The encoding happens inside the device's own chip. This is the right choice when you don't want a PC in the signal chain at all — at a remote venue, in a rack with no monitor or keyboard, or anywhere uptime and simplicity matter more than software flexibility.

Rule of thumb: if you're already building on a PC-based production setup (OBS, vMix, a software switcher), you want a capture card. If you want a self-contained box that just streams or converts on its own with nothing else attached, you want a hardware encoder.