Comcast has no 4K content and the current DVR is not 4K capable. I use the Smart Hub feature (ethernet connection to the modem) on my Samsung UHD TV to watch 4K videos from youtube. Amazon Prime and Netflix have limted 4K movie offerings, but those require subscriptions.
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Been a Comcast customer for a few weeks and have already encountered a number of X1 DVR problems (something my AT&T DVR never did in 6 yrs). Once I recorded a Showtime movie (nothing recorded on that channel afterwards) and only got 66 minutes of the 106 minute movie. Previously a regular primetime TV show stopped after about 45 minutes. Had to watch the ending online. I think the serious solution is to turn in the X1 DVR and purchase a new Tivo Bolt which not only doesn't have these recording/deleting problems reported, but also has a one-button solution for skipping the advertisements. Most network prime time shows have an electronic signal at the end of each segment and then again at the beginning of the next so DVRs that can read these signals are able to go immediately to the start of the next segment with the push of one button on the remote. Comcast's contracts with the networks probably prevent them from utilizing these signals to enable commercial interruption skipping. Tivo has no such contractual relationship with the networks. The cost will be greater with Tivo (purchase cost (500 GB or 1 TB versions) plus $150/yr subscription after the included first year plus rental of Comcast TV card ($1.50/mo) plus $10/mo for HD channels), but there might be far less frustration, and it is reportedly easier to schedule and watch recordings.
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