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HDMI Video Capture (USB 3.0, 4K)

CAP-HDMI-USB3

Brings an HDMI source into a computer as a camera, for recording or streaming.

Type: Converter
Connectors: HDMI / USB-A

In-depth technical details

HDMI Type-A carries 19 pins, not just the video signal: TMDS pairs for the picture itself, CEC (single-wire remote control across connected devices), DDC/+5V (the EDID handshake -- how the source learns which resolutions the display supports), and HPD (Hot Plug Detect -- how the source knows a display is connected at all). USB-A's 4 pins are the simple case: VBUS (+5V power), a D+/D- differential data pair, and GND.

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End A

HDMI Type-A

01 19 pins Three differential TMDS pairs carry picture and sound, a fourth carries the clock, and the rest are named-function pins.
02 CEC A single wire that lets one remote control multiple connected devices, e.g. a TV and a receiver.
03 DDC / +5V The EDID handshake -- how the source learns which resolutions the display supports.
04 HPD Hot Plug Detect -- how the source knows a display is connected at all.
05 Metal shell The shell is grounded and wraps the pins, keeping interference out of a very high-frequency signal.
06 Strain-relief boot Stops the wires flexing where they leave the plug — the exact point most cables fail.
07 Outer jacket The outer sheath protecting the conductors inside from abrasion and moisture.

Technical illustration, not a photo of the actual product

End B

USB Type-A

01 VBUS +5V power. Slightly longer than the other pins so it mates first and breaks last.
02 D+ / D− The differential data pair -- the same signal inverted on each wire, so noise cancels at the receiver.
03 GND The common ground -- the voltage reference every other signal is measured against.
04 Metal shell The plastic tongue sits in one half of the shell only, which is why the plug goes in one way up.
05 Strain-relief boot Stops the wires flexing where they leave the plug — the exact point most cables fail.
06 Outer jacket The outer sheath protecting the conductors inside from abrasion and moisture.

Technical illustration, not a photo of the actual product

From the published standard

How it works

The device re-encodes the incoming HDMI signal as video conforming to the standard USB Video Class (UVC), so the HDMI source appears to the system as an ordinary webcam with no special driver -- any streaming or recording software that supports webcams works with it directly. The real spec that matters is the maximum resolution and frame rate it supports.

Function: Re-encodes HDMI input as a standard UVC webcam device
Driver: None needed -- appears as a generic webcam

This information comes from published sources about this type of product, not from the supplier.

en.wikipedia.org

Applications

Connecting a modern device to an older screen
Driving a meeting-room projector

Technical specifications

Type	Converter
Connectors	HDMI / USB-A

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