[Cin] ms2130 hdmi-usb dongles

Terje J. Hanssen terjejhanssen at gmail.com
Sun Feb 12 23:15:57 CET 2023

Den 08.02.2023 21:05, skrev Andrew Randrianasulu:
> https://www.cnx-software.com/2022/11/07/ms2130-based-4k-hdmi-to-usb-3-0-video-capture-dongle-sells-for-19/ 
> "I learned about the video capture dongle via Mateusz Starzak 
> <https://twitter.com/MateuszStarzak/status/1589595781971181568> who 
> purchased a sample on Aliexpress 
> <https://s.click.aliexpress.com/e/_Dd6uEUB> and confirmed support for 
> uncompressed YUV @ 1080p60. He also mentioned the latency to be around 
> 6 to 11 frames depending on the resolution with 720p input to 720p 
> output only looking slightly faster than 1080p input to 1080p output."

My tests with the return-object Hama ms2109 uncovered it failed on FHD 
video due to unuseable 5 fps, while it managed 422 subsampling and 8-bit 
color depth.

I mentioned I have ms2130 in order, yes.

Reading from the ms2130 specs:

     Support input resolution up to 4K at 30Hz;
     Support output resolution up to 1080P at 60Hz YUY2;
     Support 24/30/36bit Deep color;

The different way to specify color depth/color precision/bit depth: 
8-bits or 10-bits is confusing.

Regarding "24/30/36bit Deep color" I found the following in wikipedia:

True color (24-bit)

     24 bits almost always use 8 bits each of R, G, and B (8 bpc).
     224 gives 16,777,216 color variations.
     humans can see the changes between some adjacent colors as color 

Deep color (30-bit)

     Deep color consists of a billion or more colors.[15] 230 is 
1,073,741,824. Usually this is 10 bits each of red, green, and blue (10 
     Using 12 bits per color channel produces 36 bits, 68,719,476,736 

> well, I hope Terje's camera can be switched into hdmi progressive 
> output mode .....

Yes, and it has already proved to do this even better than first 
expected, I think.
Again, according to S. Mullen's handbook for V1 and FX7 (who mentioned 
BMD's capture cards in this context):

    Sony’s 3ClearVid technology is tightly integrated with Sony’s
    Enhanced Imaging Processor (EIP). According to Sony, the EIP works at
    1920x1080 in a 4:2:2 color space. The EIP has a 2-million-pixel
    buffer for each of the three primary colors.

    When the camera is operating, the EIP generates uncompressed
    1440x1080i with a 4:2:2 color space. Uncompressed 4:2:2, 8-bit,
    digital video plus dual-channel, PCM, 16-bit, 48kHz audio are output
    via the HDMI port, while 4:2:2 analog is output via component-out.
    Therefore, you can record 4:2:2 live HD video from the camera
    without MPEG-2 compression.

According ot my tests FX7 created FHD 1920x080p, 8-bit 422 video..
I also tested 1440x1080 video size, which was not listed among v4l2 
supported format. This format was automatically encoded as 1280x1024.

So I also wondered how it was possible to get encoded (SD) 720x576 and 
1280x1024, though they supported by v4l2/capture card?
I think the interesting explanation also has been found in Mullen's 

    If the HDMI handshake determines that the device can accept
    1080i—then 1080i is sent. If the handshake determines that the
    device can only accept 480i/576i—then
    480i/576i is sent.

> contain few links. Of course main problem is verification ..... if 
> they just paint them (usb connectors) blue for no reason ...:/

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