[Cin] ms2130 hdmi-usb dongles

[Terje J. Hanssen]

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:

https://en.wikipedia.org/wiki/Color_depth#True_color_(24-bit)
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 
banding.


https://en.wikipedia.org/wiki/Color_depth#Deep_color_(30-bit)
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 
bpc).
     36-bit
     Using 12 bits per color channel produces 36 bits, 68,719,476,736 
colors.

>
> 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 
handbook:

    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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