5102 CM5IO HDMI IN EN

Keywords

Raspberry Pi, CM5 Core board, RPiOS, HDMI IN, Video Capture

I. Introduction

The CM5IO_HDMI_IN is a 1920x1080 resolution video capture card specifically designed for the Raspberry Pi platform. The combination of Raspberry Pi OS and its supporting software tools enables the functionality of video recording and live streaming for HDMI signal sources. The expansion board adopts a USB 2.0 port to connect with the Raspberry Pi OS and can be fixed above the 40Pin GPIO. It is compatible with our company's CM5IO_Mini and CM5IO_Plus expansion boards, and can also be used with the Raspberry Pi 4B, Raspberry Pi 5, as well as the Raspberry Pi CM5IO board. It can also be used temporarily with a PC if assembly isn't required.

II. Hardware Spec


Power supply and communication ports:	USB2.0, use either a USB-C or a 1.25mm-4P connector, choose one to use.
Video input:	1, standard HDMI input, supports 19201080 and 4K resolution.
Video Recording:	The highest supported resolution is 1920*1080.
Record button:	*1, implement through one GPIO of the 40-pin GPIO.
Others:	Reserve 4 positioning holes for the Raspberry Pi CM5 dimensions, allowing stackable assembly for expansion with 4G/temperature-humidity modules/GPS, etc.
Size:	56*65mm

III. Module test

Software: The version of Raspberry Pi OS is 2024-07-04-raspios-bookworm-arm64.img.xz

The download link is:

https://www.raspberrypi.com/software/operating-systems/#raspberry-pi-os-64-bit

Hardware: CM5IO_HDMI_IN paired with the CM5IO MINI expansion board, connect the 1.25mm-4P USB port on the module to the USB port on the extension board, as shown in the following figure:

The installation and setup of OBS can be referred to (this link: OBS Installation and General Settings). Just follow the regular settings, but there are two points to note:

1. Set the resolution of the output video

The default output resolution of OBS is 720p. If you want to input other resolutions, you need to set them manually.

Go to "File - Settings - Video" and set the "Output (Scaled) Resolution" to 1920x1080.

2. Image Settings

To avoid color bias, some settings need to be adjusted for the output image.

Click 'Video Capture Device' to open the settings window:

Then configure the settings according to the image below:

Video Format Settings::

Brightness, Contrast, Saturation, Hue Settings:

Save the settings and exit the setup menu.

Click "Start Recording" under "Controls" to begin recording. The video window will continue to display the input source's image during the process. Once recording finishes, the software will save the video in the main directory:

We recorded a 2m10s video, with the specific video parameters as follows:

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