Tinker only does 4k30, I need 4k60. I'm currently using a RaspPi for 1080p60, but I am configuring the ROCK64 now.

Also, in case you misunderstood, I'm not using a camera with these devices, I am using these devices as a camera. I plug the HDMI out directly into my capture device to test capture/rendering/encoding/etc. Previously, I had to use a real camera and point it at a move to get some nice motion and color. Now, I just power on my RaspPi and use the HDMI out. Our assembly line now also uses them to burn in our devices.

I think you mean to say you are using these devices to simulate a camera?

OP is probably talking about something like this:

http://www.lcdracks.com/racks/DLW/V-SG4K-HDI-signal-generato...