For those interested, I may be able to shed some light on the inherent microstutter with the Pro and why some people are not seeing it...
I recently bought a Vertex to control (via Crestron) my projector modes when using the Nvidia Shield. What an awesome device!
So whilst writing the Crestron module, I thought I'd have a look at the Pro's framerates ... anyway - quite enlightening..
mentioned in a previous post that both the Panasonic UB920 and the Oppo 203 showed a framerate of 23.973fps and neither exhibited microstutters.
I can confirm that (here at least) the Shield shows a framerate of the same 23.973fps and again, no microstutters.
And the Dune, at 1080p also has a framerate of 23.973fps in all modes (8, 10, 12-bit 444 and 12-bit 422) and no microstutters that I've seen.
Somehow, a slightly slower frame rate does not seem to affect playback in the way an accelerated one does. Theoretically, a frame rate of 23.973fps should result in a dropped frame every 5m 59s.
At 4K, the Pro is a different kettle of fish.
At 8-bit 444 - 23.973fps and no stutters as far as I can see.
At 12-bit 422 - 23.973fps and again no stutters so far.
At 12-bit 444 - 23.981fps and repeated frame every 3m 20s - definitely a microstutter
Oddly, 10-bit 444 which is a valid HDMI mode does not seem to work on the Dune - audio drops out and there are sparklies present - this would usually be a sign of a bad HDMI cable, but I don't think this is the case here since this mode transmits at 371MHz and 12-bit 444 plays flawlessly (except for the repeat frames!) and that transmits at 445MHz. Also, 10-bit 444 is at 23.988fps which although I haven't subjectively tested, theoretically would result in a repeat frame every 1min 23s.
So, you would expect that the mode to choose would be 12-bit 422 (this is the mode the Shield works perfectly in) BUT....
12-bit 422 exhibits chroma banding (obviously 8-bit 444 does too, but no-one in their right mind would use 8-bit for UHD rips).
So it would seem we are stuck with 2 modes to choose from for 4K content:
12-bit 422 which is the default setting but exhibits chroma banding or
12-bit 444 which does not show banding but exhibits a microstutter due to accelerated frame rates.
I've sent bug reports to Dune on both issues and have got the standard reply. I suspect as I've said before though that this is a limitation on the SOC and out of Dune's hands.