So you're trying to put the Pi in between the output from your TV provider (presumably some box or other) and your TV, to act as a re-broadcaster of the HDMI output provided by the provider?
The Pi basically cannot use HDMI as input, only as output (to the TV).
Have a look at the links below (and the further links in them) for some background on people who have tried it in the past:
https://www.geeky-gadgets.com/raspberry ... 4-03-2014/
Some of the USB options may work on a PC, but it is questionable whether a Pi could support them (it would certainly need a Pi4, and even that would be a long-shot I would say).