Recently purchased a Firestick and have happily made this my primary tv-set-top box relegating Roku3 to standby status. Both picture and sound are vastly better on Firestick.
However, some video, mostly European TV (but this isn't scientific) via Amazon suffers juddering where the motion pauses (maybe a couple tenths of a second) for several frames making the motion jerky.
At first I thought this might be some compression artifact where frames were dropped if the server/Internet/LAN had bottlenecks delivering video. It happens often enough but only on certain video content that I think it's a frame-rate issue or transcoding issue with the media.
I increased the TV's juddering compensation to try to smooth video motion and this helped a slight bit, but it's still noticeable.
Googling the problem, it appears some have found the solution to be setting the Firestick's frame-rate to 24Hz via a hidden admin menu. Is this the only solution? It seems the Firestick should automatically adjust its frame-rate to the native rate of the media to avoid juddering. Also, what will happen when viewing US media that typically has a frame-rate close to 30Hz?
I think I set the Samsung TV's framerate to run at the same rate as media, but I haven't checked this lately. This could also be an issue.
After fiddling with the TV obsessively the juddering/stutter/dropped frames have gone away. I did not attempt any changes to the Firestick settings. Viewing all types of video from different providers/apps everything is working well.
Not sure what I did, if anything, that corrected the issue. Reverting to old settings didn't make the problem occur again. But I fiddled a lot. May have been some combination.
It may be that my fiddling caused some sort of HDMI handshake refresh that got everything talking together nicely.
It's performing very well now. I'll update if the symptoms re-appear.