GoMax Electronics CAP-50CI-4K-PLUS User manual

CAP-50CI-4K-PLUS
USB-C 4K120 Video Capture Box with Scaler, HDMI 2.1
loopout, Audio & HcDR10 to SDR Conversion
User Manual
rev: 230424
Made in Taiwan
TABLE OF CONTENTS
INTRODUCTION.....................................................................................................................1
PACKAGE CONTENTS..........................................................................................................1
FEATURES.............................................................................................................................2
SPECIFICATIONS..................................................................................................................3
PANEL DESCRIPTIONS.........................................................................................................4
CONNECTION DIAGRAM.......................................................................................................5
VIDEO STREAMING...............................................................................................................6
TROUBLESHOOTING..........................................................................................................14
USB PIN DEFINITION...........................................................................................................15
WARRANTY .........................................................................................................................16

-1-
INTRODUCTION
The CAP-50CI-4K-PLUS USB-C 4K120 Video Capture Box with Scaler, HDMI 2.1 loopout, Audio &
HDR10 to SDR Conversion provides a professional way to capture HDMI video signals. It adopts USB 3.1
Type-C Gen 1 (USB 3.0) interface, which can realize high-speed transmission. In addition, the HDMI input
and loopout can support up to 4K2K 120Hz. Users can connect to 4K2K 120Hz source and capture Ultra
HD(4K2K@30) video by this capture device. Besides, CAP-50CI-4K-PLUS can capture and display
original uncompressed HDMI video with more realistic color rendition. CAP-50CI-4K-PLUS also uses
large volume image buffer technology which effectively avoids the video tearing. The high sampling rate
and high sampling accuracy assure images with high sharpness, rich details, and less color edges. Also,
with HDR10 to SDR conversion, PS5/Xbox* players can enjoy 4K2K@120 HDR games on 4K TV and record
the real-time 4K2K@30/1080P@120 video streams with SDR quality through USB 3.0 at the same time.
PACKAGE CONTENTS
1x CAP-50CI-4K-PLUS
1x 5V power adapter
1x USB 3.0 A to C Cable (host to device)
1x User Manual
* PS5 & Xbox Series X also support 1080P120
-2-
FEATURES
HDMI video and audio streams over USB 3.1 Type-C Gen 1
Supports UVC1.0/1.1/1.5
Supports video resolution up to 4K2K@30/1080P@1201 (Video stream over USB-C)
HDMI 2.1 compliant
Supports HDMI input & output up to 4K2K 120Hz 4:4:4/4:2:2/4:2:0
Supports HDR, which is 4K2K@60 4:2:0 10bits/12bits
HDCP 2.3 and 1.4 compliant
Allows any output to view any HDMI source at any time
Supports deinterlace & scaler2
Supports mic-in mix with HDMI audio
Supports HDMI audio extraction
Supports HDR10 to SDR conversion3
Supports playing 4K120 HDR on HDMI out while streaming perfect 4K2K@30/1080P@120 with SDR
colors for gameplay capture.
Volume control knob to adjust the MIC/Headphone volume.
Auto-detection on video format to ensure plug-play operations
Recording Video Format: Software Compression
Works on multiple operating system platforms (Windows 7/8.1/10/11, Mac and Linux OS)
Compatible with most 3rd party software such as OBS Studio and AMCap
Supports USB 3.1 Gen 1 (RGB/YUY2/NV12/P010) 4 (capture up to 4K2K@30) and USB 2.0 (YUY2/NV12)
(capture up to 1080@15)
Low Latency (3~4ms at 1080P)
USB-C reversible
System Requirements (Recommanded)
- Windows® 7(SP1) / Windows 8.1 / Windows 10 / Windows 11
- PC: Intel® CoreTM i5-4440 3.10GHz + NVIDIA® GeForce® GTX 660 or higher
- Laptop: Intel® Core i7-4810MQ + NVIDIA GeForce GTX 870M or higher
- 4GB RAM or higher
*Video quality is apparently related to the capability of computer and software setting.
**Please use the included USB 3.0 cable in the box to protect the device and avoid further
compatible issues.
***Video resolution change may require to restart software.
****Video output format is related to the software limitation. For example, the AMCap
software does not support NV12 format.
1. 4K2K@30/1080P@120 ONLY support on NV12 format
2. Scale-up supports up to 1080P@120
3. NOT supports HDR10 plus, HLG, and Dolby Vision to SDR conversion
4. (1) It is recommended to select P010 format to record HDR videos
(2) P010 format only support scale down

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SPECIFICATIONS
Model Name
CAP-50CI-4K-PLUS
Technical
Role of usage
Video Capture Device
Input Video bandwidth
Up to FRL 5 (40G)
Output bandwidth(USB-
C)
Up to 5 Gbps (USB-C)
Output bandwidth(HDMI)
Up to FRL 5 (40G)
Video support(USB-C)
Up to 4K2K@30/1080P@120
Video support(HDMI)
Up to 4K2K 120Hz 4:4:4/4:2:2/4:2:0
Audio Input
HDMI Embedded Audio & Stereo audio Input
Audio Support
HDMI output up to 7.1ch, Toslink up to 5.1ch, Stereo audio up to 2ch
Recording Mode
Software Compression
Recording Video Format
RGB/YUY2/NV12/P010 (USB3.1 Gen 1), YUY2/NV12 (USB2.0)
ESD protection
Human body model —±15kV [air-gap discharge] &
±8kV [contact discharge]
PCB stack-up
4-layer board [impedance control —differential 100Ω; single 50Ω]
Firmware update
Feasible via USB-C Port
Input
1x HDMI+ 1x 3.5mm
Output
1x USB-C + 1x HDMI + 1x 3.5mm + 1x TOSLINK
HDMI connector
Type A [19-pin female]
USB connector
USB 3.1 Type C (SuperSpeed USB)
Software compatibility
(not complete list)
OBS Studio (Windows, Linux, MAC), AMCap (Windows), Potplayer (Windows)¸
VLC (OS X, Linux), XSplit Broadcaster (Windows), Skype (Windows, OS X),
Zoom (Windows), Hangout (Windows), TeamViewer (Windows)
OS Support
Windows 7 /8.1 /10/11, Mac and Linux OS
Mechanical
Housing
Metal enclosure
Dimensions
[L x W x H]
Model
177 x 81 x 22mm [7" x 3.2" x 0.9"]
Package
198 x 137 x 74mm [7.8" x 5.4" x 2.9"]
Carton
420 x 400 x 300mm [1'4"x 1'3" x 11.8"]
Weight
Model
165g[5.8 oz]
Package
445g[1 lbs]
Power supply
Via USB-C
Power consumption
4.5 Watts [max]
Operation temperature
0~40°C [32~104°F]
Storage temperature
-20~60°C [-4~140°F]
Relative humidity
20~90% RH [no condensation]
-4-
PANEL DESCRIPTIONS
1. STEREO AUDIO OUT: Audio extracts from HDMI input
2. STEREO AUDIO IN: Connect to analog stereo audio source
3. S/PDIF OUT: Audio extracts from HDMI input
4. RESET BUTTON: Reset the device
5. STEREO AUDIO OUT VOLUME KNOB: to adjust the stereo audio out sound level
6. STEREO AUDIO IN VOLUME KNOB: to adjust the stereo audio in sound level
7. LED INDICATOR: Power & input signal indicator LED
[Blue] Device power on (no input signal)
[Green] Input detects HDMI signal
[Red]1 Input source is HDCP protected
8. POWER JACK: Connect to the +5V DC power supply unit
9. USB-C OUT: Connect to a USB host (PC, NB, MAC…)
10. LED INDICATOR: USB-C indicator LED
[Red] 2 Connect the device to the USB 2.0 port on the host
[Green] Connect the device to the USB 3.0 port on the host
11. HDMI OUT: Connect to a HDMI display
12. HDMI IN: Connect to a HDMI source
1. When the input source is HDCP protected, LED will become red to indicate the content
is legally encrypted and can NOT be captured.
2. If you plug the capture device into the USB 3.0 port on the host, but the LED indicator
lights up red, it means that the device is working according to the USB 2.0 specification.
It could be an issue with the USB cable or USB Port.

-5-
CONNECTION DIAGRAM
-6-
VIDEO STREAMING
Create a Video Streaming
Users can create video streams on the streaming service platform. The below steps show how to complete the
video streaming settings from Twitch and YouTube.
Twitch
1. Browse the Twitch website (https://www.twitch.tv/) and log in, then select "Creator Dashboard" from your
account drop-down menu at the top right of the screen.
2. Find "Preferences" in the left menu, and click "Channel", then you will see "Primary Steam key" on the screen.
Copy the "Primary Steam key" and paste it into the "Stream Key" field in the OBS, then click "Start
Streaming" in the software.
* Please refer to steps 4-6 of the OBS software control program.

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3. Go back to Twitch and select "Channel" from your account drop-down menu.
4. At this point, you will see the player start live streaming.
-8-
YouTube
1. Browse the YouTube website (https://www.youtube.com/) and log in, then lick "Go live" from the "Create"
icon menu at the top right of the screen.
* If your account is using YouTube for the first time to create a video stream, you need to wait 24 hours to
enable the function.
2. Click "Stream" in the left menu, and fill in the relevant information of the live video to create a new stream.

-9-
3. You will see "Stream key" from the “STREAM SETTINGS” below. Copy the "Stream key" and paste it into the
"Stream Key" field in the OBS, then click "Start Streaming" in the software.
* Please refer to steps 4-6 of the OBS software control program.
4. Next, go back to YouTube, and then wait for 30-60 seconds, the player will display the live preview. At the same
time, the "GO LIVE" button at the top right will turn blue, please press this button.
5. The player on YouTube will start live streaming.
-10-
Stream and record videos with OBS
OBS is popular USB capture freeware and has excellent compatibility. Please start with OBS if users are not
familiar with USB capture device.
Download the software
Browse the download page of the OBS official website (https://obsproject.com/download), then select the
suitable computer operating system and start downloading.
Start the software control program
After downloading the software, please open it and follow the below steps to complete the video streaming
settings.
Step1
Step2-3
Step4-7

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1. First, find the "Scenes" window, click "+" in the lower left corner, and then enter the name of the scene to
create a new scene.
2. Find the "Source" window, click "+" in the lower left corner, and then select "Display Capture" or "Video
Capture Device" to create a new source.
3. Next, you can set display capture properties. If you select "Display Capture" in step 2, you can select the
primary monitor or other extended monitor as the display source. If you select "Video Capture Device" in step
2, you can select USB video device as the display source. After all settings are completed, click “OK”.
-12-
4. Click "Settings" and then select "Stream" to perform streaming settings. Users can choose service providers,
including Twitch, YouTube, etc.
5. Paste the stream key provided by the service provider into the "Stream Key" field, then click "Apply" and "OK"
after setting. In addition, users can lick "Get Stream Key" at this step to open the service provider website.
6. Please click "Start Streaming". At this time, the screen after clicking "Start Streaming" will be displayed in
the live video.

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7. On the other hand, users can also click "Start Recording" to record videos with OBS. Besides, you can click
"Settings" and then select "Output" to set “Recording Path” and “Recording Format”.
The procedures the manual demonstrates are based on the interface that each website
provides at the time when the manual is written. The most recent way to make live
streaming happen is supposed to be very likely as the above procedures but subject to
change by the website interface update from the social media.
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TROUBLESHOOTING
Our USB device has done comprehensive tests before shipment. Most of the incompatibilities we
have experienced are not from the USB capture device itself, but from the sophisticated software and
hardware combination of PC or laptop. Please follow the following suggestions to see any helps.
1. OBS is popular USB capture freeware and has excellent compatibility. Please download it and start
with OBS if users are not familiar with USB capture device.
https://obsproject.com/download
2. Due to the complexities of OS and computer hardware, different USB ports on PC or laptop may
have different performance or limitation. Please try all USB ports to see if there are any differences.
3. Please must use the USB cable in box. We do not guarantee the overall performance when the USB
capture box works with some other USB cables.
4. HDMI cable quality may also play an essential role when capturing. Please be sure of that HDMI
cable can do 1080P@60 HDMI signal transmission or better. Try different cables when the device is
not able to work as expected.
5. If audio has noise when using the PotPlayer software, please adjust the audio renderer to WaveOut
on the software. The setting path is:
PotPlayer→Audio →Audio Output →Audio Renderer →WaveOut
6. If there are problems such as video flipping or wrong direction when using VLC software, please
rotate, flip or transpose the video in the VLC software to correct the video. The setting path is:
Tool →Effects & Filters →Video Effects →Geometry →Transform

-15-
USB PIN DEFINITION
P1
P2
VBUS
A4, B4, A9, B9
1
VBUS
Dn1
A7
2
D-
Dp1
A6
3
D+
GND
A1, B1, A12, B12
4
GND
SSTxn1
A3
5
SSRX-
SSTxp1
A2
6
SSRX+
GND
A1, B1, A12, B12
7
GND
SSRxn1
B10
8
SSTX-
SSRxp1
B11
9
SSTX+
-16-
WARRANTY
The SELLER warrants the CAP-50CI-4K-PLUS USB-C 4K120 Video Capture Box with Scaler, HDMI
2.1 loopout, Audio & HDR10 to SDR Conversion to be free from defects in the material and workmanship
for 1 year from the date of purchase from the SELLER or an authorized dealer. Should this product fail
to be in good working order within 1 year warranty period, The SELLER, 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 covered 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. Customers outside Taiwan are responsible
for shipping charges to and from the SELLER. Cables are limited to a 30 day warranty and cable must be
free from any markings, scratches, and neatly coiled.
The content of this manual has been carefully checked and is believed to be accurate. However,
The SELLER assumes no responsibility for any inaccuracies that may be contained in this manual. The
SELLER 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 CAP-50CI-4K-PLUS features and specifications
is subject to change without further notice.