Just a little heads up, that PicCap, an Hyperion sender app is nearing a state where it is running flawlessly.
What does this mean: The sender-app is running directly on your LG TV, is grabbing the picture and is sending the info to Hyperion via flatbuffer.
No additional hardware required, no USB-grabbers, no HDFury Diva, no splitters. Dolby Vision: Sure! 120 Hz: Yes! Tone Mapping? Not needed!
Prerequisites: Hackable firmware on your LG OLED! Hopefully you did not update yours to the latest firmware. You need to root your TV