Originally Posted by markrubin
I have the UN40JU7100
I am trying to get the Xfinity Ultra HD sampler app to work
I can log on and hit watch: and it starts to load....but it never finishes
Comcast has no clue and says the TV may not be compatible
I downloaded the Ultra HD Sampler app yesterday, and it's working on my 2015 Samsung UN50JU7100. It's supposed to work on select 2014 Samsung UHD models and all Samsung 2015 and later UHD models. Apparently the app was updated very recently, but Comcast definitely has a lot more work to do on it. You might try deleting and re-installing it to be sure you have the current version (2016_08_01). The app is called "Ultra HD Sampler," and can be found under the "Videos" tab. If you sort the listings Z-to-A, you won't have to scroll very far to spot it.
Someone on the Xfinity forums said they began watching the 2016 Olympics opening ceremony but the buffering pauses became so annoying they gave up. I've not seen any Olympics content listed yet, but maybe Comcast took it down because it wasn't working properly.
I've only watched a few episodes of "Outlander." This is what I found:
Pausing the stream and restarting without leaving what you're watching seems to work fine. But if you do anything to actually stop the feed, e.g., by changing the TV's source to check a game score, when you go back to the app and try to continue playing the same 4K content it won't resume from where you left off. All you get is a still frame of the last scene you watched and the endless buffering graphic. You have to start the stream all over from the beginning.
If you get a buffering pause, chances are the stream will not resume. In the 5 times this happened the stream continued only once.
Fast forward and reverse don't work, and you can't bring up the stream's progress bar to drag forward and back.
Once you're watching something the only button that works is Play/Pause.
Trying to exit from what you're watching is a bit of hit and miss. Sometimes the Return button will take you back to the app's main page, but mostly is just does nothing.
One more bit: in everything I watched, at some point there was a noticeable problem with lipsync, which got worse the as the program progressed. Sound lagged behind the picture by 1.5-2.0 seconds. Many others have reported this as well in the "Xfinity TV / Website & Mobile Apps / 4k Olympics Broadcast??" thread on the Xfinity forums.
Overall a sort of frustrating experience with an app that's definitely not ready for prime time. So, if you can't get it to work at all you're not missing much.