No, like I said if you're forcing 24hz when the apps aren't wanting to output that, then you have some really janky conversions happening that can significantly screw up the motion of the video.Yes, by stutter, I mean choppiness in motion instead of smoothness, especially evident in panning scenes with low frame rate (movies) 24 fps content. I'm not particularly sensitive to judder from 3:2 pulldown, but I am sensitive (as are OLEDs due to their fast pixel response time and each frame remaining on screen longer) to motion stutter with low frame rate content.
So, to summarize what I'm seeing with my streaming device, the Fire TV Stick 4K:
With resolution set to 2160p 60 Hz = relatively smooth motion and panning shots, regardless of app/content.
With resolution set to 2160p 24 Hz (hidden menu) = stuttering motion and panning shots with movies/menus (not tested with all types of content). This mode allows displaying DV content but with much more visible stutter.
So, if motion on the streaming device appears smoother when set to 60 Hz with movies (24 fps) than when set to 24 Hz, wouldn't that also apply to the blu-ray player? With the blu-ray player, I'm not sure I see a difference between 24 vs 60 Hz output.
Blu-ray players on the other hand are designed to output 24hz at the correct frame cadence, so it wouldn't have that problem. Now, suddenly getting proper, pure 24fps display without any frame blending or shutter strobing can feel somewhat weird to some people who are used to other kinds of displays at first, but much like properly calibrating a display, once you get used to it you'll notice certain qualities about correct motion that you'll never want to watch anything any other way.
Whenever I connect a device now that doesn't do proper 24hz I have a harder time watching it, like my Chromecast for example. Sometimes I turn de-judder to 1 on devices like that to eliminate that judder without significantly adding increased frame rate interpolation effects.
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