I am getting a Roku TV the TCL 6. Seriers. I thought because this Forum is for SmartPhones maybe somebody may know a little bit about the Video Setup for the TV. This Video Says you have to play SDR Video to get into SDR Mode. And you have to play HDR Video to get into HDR Mode. And you do this for every Mode you have to get into to Setup. But He is playing all this on YouTube. First of all I can not Find HDR Video on YouTube or Doby Vision Video or anything on YouTube. How is He doing this and what should I do?