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USB 3.0 SDI 4K capture — bring 4K broadcast SDI into your laptop.
Ask us a quick question about this product — signal compatibility, use case fit, or anything technical. We usually reply the same day.
The USB Capture SDI 4K Plus brings 4K SDI capture into the portable USB dongle form factor. Using single-link 6G-SDI input it captures 4K video at up to 30fps, with full backward compatibility for 3G, HD and SD-SDI sources.
For broadcast and live-production teams who need a portable 4K SDI capture device — for field production, fly-pack rigs, OB-truck temporary builds, or laptop-based monitoring — this is the most compact option available. The dongle is small enough to live in a kit bag yet captures the full 4K resolution from professional broadcast cameras.
The active SDI loop-through keeps downstream broadcast monitors and switchers running while capture is active. FPGA processing means the host laptop's CPU stays free, allowing comfortable simultaneous streaming or recording.
| SKU | 321000000 |
| Brand | Magewell |
| Category | USB Capture |
| Form Factor | USB 3.0 dongle (Type-A) — bus powered |
| Host Interface | USB 3.0 (SuperSpeed) |
| Video Input | 1× BNC (SD/HD/3G/6G-SDI) |
| Loop-through | 1× BNC (loop-through, max 4096×2160 30fps via 6G-SDI) |
| Max Input Signal | 4096×2160 30fps (6G-SDI) |
| Max Capture Resolution | Up to 4096×2160 — 120fps max (USB bandwidth limited) |
| Signal Features | SD/HD/3G/6G-SDI — Cable equalizer: SD up to 300m, HD 200m, 3G 150m, 6G 100m — RGB/YCbCr 4:4:4/4:2:2 10/12-bit — Up to 8-ch audio at 48kHz — 3.5mm line in — SMPTE 352 — HDR10 |
| Video Capture Formats | YUY2, UYVY, RGB24, RGB32 — Up to 120fps (limited by USB bandwidth) |
| Video Processing | ~160 Mpixels/s pipeline — Cropping, scaling (up/down), de-interlace, aspect ratio conversion, colour format conversion, frame rate conversion, flip & mirror |
| Audio | SDI embedded up to 8-ch at 48kHz — 3.5mm line in — 3.5mm headphone output |
| Recommended OS | Windows 10/11/Server 2016/2019/2022/2025 (x86 & x64) — Linux x86/x64/ARM kernel 2.6.35+ — macOS 10.9+ / 10.12+ |
| Supported APIs | Windows: DirectShow, DirectKS, WASAPI — Linux: V4L2, ALSA — macOS: AVCaptureSession, AudioUnit — Magewell Capture SDK (MWCapture) |
| Compatible Software | USB Capture Utility (firmware upgrade, parameter config) — OBS, vMix, Wirecast, XSplit, VLC, any DirectShow/V4L2/UVC software |
| Power | Bus powered via USB 3.0 — Max 4.5W |
| Dimensions & Weight | 111mm × 32mm × 16mm — 49g |
| Working Environment | Operating: 0°C to 55°C — Storage: −20°C to 70°C — Humidity: 10–90% non-condensing |
| UK Stock | In Stock |
| Warranty | 2–3 Years (Magewell manufacturer warranty) |
Full specifications: magewell.com/tech-specs/usb-capture-sdi-4k-plus ↗
Everything included in the box with the USB Capture SDI 4K Plus. Part numbers and accessory images from official Magewell documentation.


If anything is missing from your delivery, contact us within 7 days and we will arrange a replacement.
Official Magewell documentation for the USB Capture SDI 4K Plus. Datasheet is mirrored on our server for direct download; drivers, firmware and software live on Magewell's download centre and open in a new tab.
Browse the full Magewell literature library for all product catalogues and datasheets.
Yes. The USB Capture SDI 4K Plus appears as a standard UVC capture device in OBS Studio on Windows, macOS and Linux — no extra plugin or driver needed. Select it as a Video Capture Device source.
The USB Capture SDI 4K Plus supports Windows, macOS and Linux. It uses the UVC standard so it works without installing drivers on most platforms.
The USB Capture SDI 4K Plus captures at up to 4K @ 30fps. Check the full spec sheet for the complete list of supported resolutions and frame rates.
Yes. Because the USB Capture SDI 4K Plus presents itself as a standard webcam/capture device via UVC, it is recognised by Microsoft Teams, Zoom, Google Meet and most other video conferencing platforms without any additional software.
Yes — it draws power from the USB port itself (USB bus-powered), so no external power supply is required.
The USB Capture SDI 4K Plus connects via USB 3.0. It is backward compatible with USB 2.0 ports but capture performance will be limited at lower USB speeds — a USB 3.0 port is recommended for full-resolution capture.