Hello
if you have Android Tv you can install an app called Hyperion Android grapper but however you will need to run Hyperion on another computer / Pi
i have an old Pc in another room and i use that app to connect to the pc remotely
for the LEDs i use ESP2866 with Wled
so basically my tv sends video to Hyperion on the old PC via the app and the PC connect to Wled witch controls the LEDs
about your second question i can't tell because i don't have OLED TV but i think it should be fine