AVMATRIX TB-C12-4K HDMI Video Grabber

Built for laptop-based ingest where signal integrity and bandwidth matter, the AVMATRIX TB-C12-4K brings a single-channel 4K HDMI capture path into a compact Thunderbolt-class box. It accepts HDMI 2.0 up to 4K60, provides an HDMI loopout for local confidence monitoring, and connects to the host through two high-speed ports compatible with USB4 and Thunderbolt 3/4/5-like protocols at up to 40Gbps. For operators who need a clean handoff between camera, recorder and workstation, that means one unit can sit between the source and the screen without forcing a compromised viewing setup during long takes or live segments.

Beyond capture, the unit also acts as a dock: DisplayPort 1.4 output and USB 3.1 Gen 2 open room for a monitor chain, fast SSD, keyboard or control surface. In an edit bay, DIT cart or streaming desk, the DP connection can feed a desktop display at high bandwidth and, on Windows, support MST daisy chaining; the USB-A port is useful for direct recording to external media or adding peripherals without reaching for a separate hub. A 48 kHz / 24-bit audio path and support for REC.601 / REC.709 help keep picture and embedded sound aligned for broadcast, event and teaching feeds.

The AVMATRIX TB-C12-4K fits Windows and Linux systems and is listed with software environments such as OBS, vMix, XSplit, VLC, Wirecast and DirectShow/V4L2 applications. Active cooling and rated 24/7 operation matter in venues where capture runs for hours: conference sessions, lecture recording, church streaming, esports rooms or multi-shift production spaces. Add a console, media player or camera on HDMI, send loopout to a director’s monitor, and ingest the feed on a Thunderbolt-equipped laptop that also needs external display and storage access from the same box. That mix of capture card, docking features and continuous-duty behaviour makes it a serious option for mobile production and fixed install racks alike.