There will be smooth motion of, say, a car moving across the screen, then a sudden jittery jump of the entire image, then the car is a few hundred pixels left or right of where it just was as it continues its path across the screen. On very slow scenes, its either not present or not noticeable, but on action sequences, its as though N number of frames are simply skipped, if that makes sense. Still other content, from 1080p up through 4k (which the Roku Ultra should be able to handle on "direct play"), the image is smooth and crisp, except the entire image shakes or jitters every few seconds.
Hard to describe exactly what I am seeing, they only last a split second, but they are stacked along the perimeter of moving objects, and look like they're black and white. Choppy rectangular lines on the edges of moving objects, like people. On more recent 90s TV shows, I'm not sure if its trying to "up convert" or what, but the image is crisp, however there are lines visible when there is motion. On the Roku stick/Sony TV upstairs this is a non-issue, smooth clear video. On old 90s TV show episodes (480), it looks like those old 320x200 mpg files from the BBS days when you full screen them on a 21" Sony Trinitron at 1280x1024 - totally blurry and pixels the size of my thumb nail. Roku Ultra has no audio/video sync issue, however image quality is having serious issues. Figuring the LG's internal CPU just wasn't up to the task, I bought a Roku Ultra. Changing the bitrate from "original quality" to anything else makes it work great, but I have to manually do this each and every time I watch something, which gets annoying. But the audio is 100% out of sync, all the time, on any and all content from 480p up through 4k, via Plex.
With the Plex app, I experience no image deterioration of any kind, no tearing of the screen, no jitter. The LG TV has the ability to use its own Plex app. I have the Roku stick on an old (15+ years) Sony 1080p TV upstairs, and what I am about to discuss is not present in any way on that setup - the Roku stick + Plex + ancient Sony TV works 100% with flawless picture quality and frame rate on a cheap used Sony soundbar + sub 5.1 system. Roku stick (from 6+ years ago) and now Roku Ultra. Plex server, older i7-2600 but has been running all content fine for 6+ years now in terms of performance.
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