Sorry, I don’t know much about this type of video technology or equipment. I’m more of a novice with video standards. The information you’re referring to is here: https://developers.theta360.com/en/docs/introduction/
I don’t have any experience with cards like the Blackmagic Intensity, but I was assuming that you could use those cards to get HDMI video into your computer. I actually don’t know the difference between YCbCr and 4:2:2 YUV myself. I do know that people are using different types of HDMI cards to get the HDMI video into computers, but I don’t know about the technical specifications. The HDMI video is usually popular for people that want to use something like the Teradek VidiU or the Cerevo LiveShell to stream video to something like YouTube without a computer.
Happy to continue the discussion, but just keep in mind that I have limited knowledge of the external HDMI video equipment, so what I mention may not be technically correct.
Maybe someone else can help out here?