Marshall VAC-23SHUC 3GSDI HDMI Video to USB-C Adapter User Manual
- June 4, 2024
- Marshall
Table of Contents
Marshall VAC-23SHUC 3GSDI HDMI Video to USB-C Adapter
Introduction
The Marshall VAC-23SHUC advanced USB-C (USB3.0/2.0) adapter easily connects
video and audio sources to a computer for live streaming, video conferencing,
video production and recording. Simple to use plug-and-play design seamlessly
integrates professional video sources to your choice of PC-based applications.
Select either an HDMI or SDI video source with the flip of a button. Active
loop-through outputs keep sources available for other purposes such as feeding
monitors, recorders, etc
UVC protocol support allows the video application on the attached computer to
control video format, frame rate and other settings independent of the
original source format.
Setup couldn’t be easier. The VAC-23SHUC becomes fully functional within
seconds after it is connected.
Powered by the USB port on the host computer, there are no power adapters to
fiddle with.
Features
- 3G SDI Input with active loop-through output. Supports formats up to 1080p60
- HDMI 2.0 INPUT with active loop-through output. Supports formats up to 3840x2160p
- USB 3.0 computer interface with UVC control and scaling (backwards compatible with USB 2.0)
- Efficient design – All power derived from USB port
- Plug-and-Play. Driver installation not required for most applications
- Compatible with popular applications such as: Zoom, Skype, OBS Studio and many more
Package Contents
- (1) VAC-23SHUC Unit
- (1) USB 3.0 “A – type” to “C – type” Cab
- (2) Mounting brackets with 8 attachment screws
System Requirements
- Host computer with recent operating system, such as Windows 10 or Mac OS X
- Available USB 3.0 port (supports up to 3840 x 2160p30 to host computer) or,
- Available USB 2.0 port (supports up to 1280 x 720p30 to host computer)
Connections and Indicators
- SDI Input
- HDMI Input
- Firmware Update USB 2.0 Connector
- SDI Loop Output
- HDMI Loop Output
- USB 3.0 Output to Computer
- Input Select Switch – HDMI/SDI
- HDMI LED Shows HDMI is Selected
- SDI LED Shows SDI is Selected
- Power LED – USB Power Connected
Input Side
Output Side
Setup and Quick Start
- Computer should be powered and operating. Connect the VAC-23SHUC to the host computer using the USB 3.0 cable provided. The first time the unit is used, please allow about one minute for the computer to identify the unit and setup the drivers. All three LED’s on top of the unit will light after about 3 seconds. About 5 seconds later, one of the Input Selection lights will turn off.
- Open an application such as Zoom, Skype, OBS Studio, etc. and select the Video and Audio devices. The VAC-23SHUC adapter will identify itself as “MEI USB 3.0 Capture Device”. Depending on the application used, the unit may appear as a Camera or a Capture Device.
- Before the SDI or HDMI input is attached, a message similar to the one shown below will appear in the application’s video preview window. This message will display until a video source is connected. (The Output format and frame rate may be different depending on the application software)
- Next, slide the Input Select Switch to HDMI or SDI depending on the source type (an LED on top of the unit indicates the position of this switch). Connect a video source. The on-screen message will change like the one below. This message will disappear after about 8 seconds.
- At this point, the VAC-23SHU3 is operating and ready to use! Control of the VAC-23SHU3 depends on the capabilities of the software being used for conferencing, recording, streaming, etc.
Note: Most conferencing applications will automatically set the USB output format to 720p. This does not affect the HDMI and SDI loop through outputs, they will be the same as the inputs.
Specifications
HDMI Input and Output
- HDMI Conforms to HDMI 2.0 standard
- HDCP 1.4 and 2.2 compliant
- Video Frame Rates from 23.98 ~ 60 fp
- Video Formats from 480i/p, 576i/p to 4096x2160p (4K) at 30 fps
3GSDI/HDSDI Input & Loop Ou
- SMPTE 296M, 274M, 259M, 425M (3G Level A)
- Video Frame Rates from 23.98 ~ 60 fps
- Video Formats from 480i/p, 576i/p to 1920x1080p @ 50/59.94/60 fp
USB-C Output (USB 3.0) and Backwards Compatible to USB 2.0
- Connected via USB-C (USB3.0/2.0) with formats up to 3840x2160p (UHD) at 30 fps sent to host computer.
- When connecting to a USB 2.0 port, we recommend 1280x720p or below
Audio Input
- Embedded audio on HDMI pass through (HDMI out). Channels 1 & 2 are sent to USB-C out.
- External stereo analog line level input on 3.5mm stereo TRS jack. Switches on when plug is inserted.
When mic plugged in, it replaces audio to HDMI out and USB to computer
Operating Temperature
- 0~40°C (32~104°F
Power Rating
- 5V 1.3A
Block Diagram
VAC-23SHUC Functional Block Diagram
Tips and Fixes
- My computer says, “the USB device is not recognized” or “the device does not support the required parameters”.
- FFirst, be sure to use the USB-C cable that was supplied with the VAC-23SHUC. If it becomes lost or damaged, please replace it with a “USB 3.0 type A-to-C” cable which provides the power and bandwidth necessary for proper operation of the unit. When in doubt, try another cable.
- A message like the one above can also occur when the VAC-23SHUC is connected to a USB 2.0 connector. This can be fixed by plugging into a USB 3.0 port on the host computer. USB
- 3.0 connections are usually identified by blue color inside the connector.
- If only a USB 2.0 connection is available, lowering the video source to 1280x720p at 60fp.
- The video source is 1080p50 (or 60) but the computer says the incoming video is different (760p for example). Why isn’t it the same as the source?
- The VAC-23SHU3 is compatible with the USB industry standard UVC control protocol. This allows the host computer to adjust the format and frame rate independently from the incoming source. Many applications have controls that allow changing these parameters. Video conferencing applications typically do not have these controls and simply force the settings that work best. Please consult the instructions that are provided with the application for more information.
The VAC-12HUCHDMI output is connected to a video recorder. The recorder is getting a blank picture. OR……….The HDMI output is connected to a video monitor and the picture is perfect, but the picture on the computer is black with the message Input : HDCP Content. Can this be fixed?
HDMI video contains a “copy protection” system called HDCP “High Bandwidth Digital Content Protection”. The principle behind HDCP is that copyrighted content should be seen and heard but not recorded or transmitted. What this boils down to is that material containing HDCP “flag” will be visible only on display devices, in other words, monitors, projectors and television sets. A common difficulty is that DVD players, Blue Ray players and set top boxes (cable and satellite) normally force HDCP on even when the material being played is not copyrighted. Video cameras, on the other hand, never use HDCP. Computer outputs may or may not use HDCP depending on the material being output. For details on HDCP, please visit www.hdmi.org.
Note: SDI inputs do not have content protection.
I’m trying to use VLC to test the VAC-23SHU3 but the picture looks wrong and
the video format is incorrect as well.
To connect with VLC, follow these steps:
-
Select the MEDIA tab then select OPEN CAPTURE DEVICE
-
In the Window that appears, select MEI USB 3.0 CAPTURE DEVICE for the Video Device Name and Audio Device Name then click on ADVANCED OPTIONS.
-
In the next window, change Aspect Ratio to 16:9
-
If you are connected using USB 3.0, type YUY2 for Video Input Chroma Format.
If you are connected using USB 2.0 type MJPG for Video Input Chroma Format.
Now click OK. The window will close. -
Click Play at the bottom of the remaining window. The incoming video and audio will appear. The USB audio is not clear.
This may occur when the computer audio sampling rate does not match the USB
sampling rate of 44.1 KHz. The VAC-23SHU3 does not apply rate conversion to
48KHz audio sources (such as SDI embedded audio). When there is a sampling
rate conflict, it often better to use the VAC-23SHU3 for the video conversion
and provide a separate path for audio into the computer.
Window 10 allows changing the default sample rate for incoming audio devices.
Changing this rate can resolve many issues with buzzes, warbles, etc.
Follow these steps:
- Click on the Windows Icon on the lower left corner of the desktop
- Select the “gear” icon at the left edge of the window
- Click on System (upper left corner)
- Click on Sound (left column)
- Below Input heading, check that the MEI audio device has been selected
- Below that item, click on Device Properties
- In the upper right corner, click on Additional Device Properties
- The Microphone Properties pop up window will appear
- Click on the Advanced tab
- In the pulldown window, see the current audio format and sample rate. Select the one not currently in use.
- – 2 Channel, 16-bit, 441000 Hz
- – 2 Channel, 16-bit, 48000 Hz
- Click Apply and Click OK.
- It will likely be necessary to reselect the audio device in the application.
- Confirm that the sound has improved.
Warranty
Marshall warrants the VAC-23SHU3 3GSDI/HDMI to USB-C Converter to be free from
defects in the material and workmanship for 1 year from the date of purchase
from an authorized Marshall dealer. Should this product fail to be in good
working order within 1-year warranty period, Marshall will, at its option,
repair or replace the unit, provided that the unit has not been subjected to
accident, disaster, abuse or any unauthorized modifications including static
discharge and power surges.
Unit that fails under conditions other than those specified above will be
repaired at the current price of parts and labor in effect at the time of
repair. Such repairs are warranted for 90 days from the day of reshipment to
the BUYER. If the unit is delivered by mail, customers agree to insure the
unit or assume the risk of loss or damage in transit. Under no circumstances
will a unit be accepted without a return authorization number.
The warranty is in lieu of all other warranties expressed or implied,
including without limitations, any other implied warranty or fitness or
merchantability for any particular purpose, all of which are expressly
disclaimed.
Proof of sale may be required in order to claim warranty. Cables are limited
to a 30-day warranty and cable must be free from any markings or scratches.
The content of this manual has been carefully checked and is believed to be
accurate. However, Marshall assumes no responsibility for any inaccuracies
that may be contained in this manual. Marshall will NOT be liable for direct,
indirect, incidental, special, or consequential damages resulting from any
defect or -omission in this manual, even if advised of the possibility of such
damages. Also, the technical information contained herein regarding the VAC-
23SHU3 features and specifications is subject to change without further
notice.
20608 Madrona Avenue, Torrance, CA 90503
Tel: 800-800-6608 /
310-333-0606
Fax : 310-333-0688
www.marshall-usa.com
[email protected]