Unless I am mistaken, Xfinity X1 transmits HD channel in 720p, i.e. 1280x720, so we are all wasting our money on the UHD 4k TV's. Even worse, their non-HD channels are sent in 1280x720 but with two vertical black areas to fit a 4:3 screen then the actual program is transmited within that 4:3 box. So if the program is an old film in 4:3 format, then you will see the correct aspect ratio but with two black vertical bars. On the other hand, if the program is in 16:9 like many of them are, then you are out of luck, as now you will see additiional black bar above and below the program being shown, hence resulting in a much smaller picture on your TV. For those mathematically minded, your HD program on a 65-inch HD or UHD TV will measure approximately 56.6-in horizonal x 31.8-in vertical. but for non-HD channels, like some of the HBO or Showtime channels, old 4x3 shows will measure 42.4-in widex31.8in tall, but supposedly HD programs shown in Xfinity non-HD channels will only measure 42.4-in widex23.85-in tall. X1 box allows you to stretch the screen so that the picture will now measure 56.6-inch wide but it is still 23.85-inch tall (this explains why pictures are squeezed and peope are short and fat!). Now, this means that we spent all that money to buy a 65-inch TV, but we are only using a fraction of its screen when watching premium non-HD channels from Xfinity! ABSURD. It should be relatively easy to fix this problem as a small piece of software can be written for the X1 box to ajust the signal, but it has taken Comcast, now Xfinity, over 10 years to NOT having done it. Tivo has. FRUSTRATING! Besides, why are we paying such high premium for 720p transmissions? No wonder why Netflix and Hulu are so popular these days!
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With all due respect, this has taken Comcast far too long. Tivo has this resolved many many years ago with even their early generation of HD boxes. It just detects SD programs automatically and send correct 16x9 resolution to the TV. None of these questions are to do with how to fiddle with the users TV, but how inadequate the X1 box is on this very basic configuration. For the money Comcast charges, one expects better than such smoke screen responses.
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