Question / Help Magewell USB Capture 4k plus - odd scrolling when choosing XRGB

[zero110100]

I bought a Magewell USB Capture 4k plus for streaming. It tends to scroll the capture screen to the left when I select XRGB in the video settings. My Desktop and the capture card are cloned at 2560x1440p 100hz. I switch back to I420 it stops scrolling. Any ideas?

https://gist.github.com/040254ecab1388ddd359443923dd4554

 

[sam686]

You have reached and exceeded the limit of USB 3.0 possible raw speed of 500 MB/s, with the actual video limit a little lower due to protocol overhead and audio capture. This can cause excessive capture frame drop or possibly graphics glitches.

Reduce one or more the following:
1. change capture colorspace to YUY2 (4:2:2) or I420 / NV12 (4:2:0).
2. reduce capture frame rate or reduce refresh rate from a computer being captured.
3. reduce resolution on a computer being captured.

2560x1440, 100 fps, RGB32 (XRGB) (32 bit / 4 bytes per pixel) need 1475 MB/s, WAY TOO MUCH for USB 3.0
2560x1440, 60 fps, YUY2 (16 bit / 2 bytes per pixel) need 442 MB/s
2560x1440, 60 fps,I420/NV12(12 bit / 1.5 bytes per pixel) need 331 MB/s
1920x1080, 60 fps, YUY2 (16 bit / 2 bytes per pixel) need 248 MB/s
3840x2160, 30 fps,I420/NV12 (12 bits / 1.5 bytes per pixel) need 373 MB/s

 

[Raul]

One question about this device: I guess you still need to encode the signal in OBS even if you use it. Am I right?

I don't see the point of it, unless down scaling the video helps you reduce the CPU load of the PC... is that the purpose?.

 

[zero110100]

One question about this device: I guess you still need to encode the signal in OBS even if you use it. Am I right?

I don't see the point of it, unless down scaling the video helps you reduce the CPU load of the PC... is that the purpose?.

The capture card does the encoding. There is little no cpu usage.

 

[Raul]

And what option do you use on the OBS -> Settings -> Output -> Encoder combo?

 

[Harold]

Are you capturing the same computer the card is installed in or are you capturing a separate device?