You need a capture card to do that, xiongdi.

it called CAI JI KA in Chinese. AJA BMD will do.

I have purchased the capture card, but I don't know why the camera is not displayed in the video option,What's the reason?xiongdi.

what kinda capture card do you have?  Screenshots would be helpful~

or maybe contact me on wechat

How can I add your wechat

Hi,

We hope metaborder helped you.
If you still having trouble setting up your capture card, can you give us more details, like what is your capture card name/brand, does it show up in Aximmetry's device mapper, do you use it for input or output, does your Windows operating system detects it (Windows Device Manager)?

Warmest regards,