Okay, that makes sense. Then my next question is this: how do you suppose those various 4k screensavers work? Are they just playing a 4k video stream that's made up of still images? I've got a lot of high-res images on a local NAS I would like to be able to stream as a screensaver in 4k. Does this mean I would have to bake those into a video stream first, rather than being able to have the server randomly select an image and send it to the roku one by one?
Have you seen any genuine 4K screensaver on Roku?
Well, I thought I had seen at least one in the channel store, but I just went to look and I couldn't find any. However, I somehow have a screensaver titled "Nature 4K UHD Screensaver" installed, and it's definitely outputting 4K, which is probably why I thought such a creature existed. I wonder if this is some built-in Roku screensaver with special capabilities that you can't get with the normal API?