Magewell Pro Capture Dual HDMI 4K Plus LT

About this product

Two 4K sources, two screens that must stay live, and one free slot in the PC: that is the job the Pro Capture Dual HDMI 4K Plus LT is built for. It suits live production, lecture theatres and event rigs where a camera and a presentation both need capturing and showing. It is a two-channel 4K capture card that takes two HDMI signals, each with its embedded audio, and makes both available to software on that computer at the same time. “LT” stands for loop-through: each input has its own HDMI output that passes the source on, so capture and live viewing happen together.

What goes in and what comes out

• Two HDMI inputs: HDMI 2.0 and DVI-D 1.0 signals, each input with a 594 MHz receiver. Input resolutions go up to 4096×2160 pixels.
• Two HDMI loop-through outputs: each passes its input, with embedded audio, on to a monitor, projector or other equipment, so the room display stays on while you capture.
• To the computer: a PCIe Gen2 x8 connection carrying both channels to your software.

In practice that means two sources, such as two cameras or a camera and a presentation computer, captured in one slot, with each source still feeding its own screen and no separate splitter to buy, power or mount.

Check the slot before you order

This is a normal profile PCIe x8 card, 127.89 × 102.92 mm without bracket, so plan for a full-height slot that takes an x8 card. For a low profile chassis, the single-input HDMI 4K Plus LT is the one to choose. Maximum power consumption is about 22 W.

4K and frame rate

Each input is HDMI 2.0 with a 594 MHz receiver, the signal type used for 4K at 60 frames per second, and takes resolutions up to 4096×2160. Capture frame rates go up to 144 fps, depending on PCIe bandwidth and image resolution. If you plan to run both inputs at the highest formats together, ask us and we will confirm it for your setup first.

Picture formats

• Colour depth: 8, 10 and 12-bit signals
• Colour sampling: RGB 4:4:4, YCbCr 4:4:4 and YCbCr 4:2:2, which suits computer graphics as well as camera pictures
• HDR: HDR10
• Audio: up to 8 channels of embedded audio through the SDK, so sound arrives on the HDMI cable
• Custom EDID: you can set what the card tells each source it can accept, which lets you steer a laptop or camera to the format you want

Processing done on the card

The card does part of the video work itself, before the pictures reach your software. That keeps your processor free for mixing, encoding and recording:

• Two video processing pipelines with about 720 megapixels per second of processing bandwidth, and full 10-bit processing
• Scaling, cropping and de-interlacing, plus aspect ratio, colour format and frame rate conversion, so the software receives the size and format it asked for
• On-screen overlay (OSD composition), where a graphic is laid over the picture
• Unlimited capture streams for the input channel, so you can record and stream the same source from separate programs, and a latency of 64 video lines

Works with the software you already use

Magewell supplies drivers for Windows 10, Windows 11 and Windows Server 2016 to 2025, for Linux on x86, x64 and ARM (kernel 2.6.35 and above), and for Mac OS X 10.9 / macOS 10.12 and above. The card is then used through the standard capture interfaces of each system: DirectShow on Windows, V4L2 and ALSA on Linux, AVCaptureSession on macOS. It works with VLC, OBS, XSplit, vMix and Wirecast among others, and there is an SDK for developers.

Where it sits in the range

Choose this card when you have two HDMI sources and want both looped to screens. For a single HDMI input with loop-through on a low profile card, see the HDMI 4K Plus LT. For two SDI channels, see the Dual SDI 4K Plus. The whole family is on the Pro Capture page.