Win HOW TO - Kodi 2D - 3D - UHD (4k) HDR Guide Internal & External Players
Well, there's a confirmation that I'm not alone when it comes to this problem stepping forward using KODI v.18 - KODI resizes into the top left corner when closing an external player.  In my case, it also becomes unusable.  In other words, I can't simply fullscreen it again and any attempt to interact with it results in a crash.  Not sure how it reacts for you and would be nice to know?  I also see you too experience audio issues with any driver newer than 385.28 a separate nVidia issue.  Thanks for the report.

I see no problem with your refresh rate always at 23Hz and using YCbCr 4:4:4/12bit but be aware the GUI and anything else 'Windows' prefers 60Hz allowing something to control refresh rate matching (in my case, madVR settings for external player(s) and KODI settings for VideoPlayer).

I really can't remember my results using KODI v.18 VideoPlayer for titles assigned to it (non-HDR, non-3D MVC, etc.) let alone stuttering?  I can't imagine why KODI v.18 VideoPlayer would be so problematic for you?  Something has got to be 'off' in your system as I can't believe the beta could possibly advance with what you describe.  I would definitely raise concerns in other threads.  Take note, none of this code or additions here have ANYTHING to do with how KODI performs.  All the technique applied here is AFTER everything KODI.  KODI is a front end and should perform as usual before anything back end.  Period. 

I quit testing as soon as I realized it doesn't handle external players anymore and reverted back to 17.6.  Since all of my bug reports went unanswered in all of the various threads I've raised attention, (A) nobody cares or (B) no one else can replicate, so until these problems gain more steam, nothing is going to happen for a couple individuals like you and I.  I'd suggest 'spreading the word' when and where you can in other threads.  Understand, what we do here isn't exactly all about KODI 100% and support for these specific problems isn't exactly warranted from a team of volunteers contributing open source code.  I imagine this thread is borderline tolerated depending who and how one looks at it so I don't expect much as far as fixing KODI back to how it once was when it comes to external player additions by few users.

Thanks again for the report.  Hopefully at some point a KODI developer will address it before it's too late.

Btw, if you're a lurker and you follow this thread, it's very simple to replicate our little problem:
You need a 4k display with an external video card.

Set your GPU to 2160p.  With KODI v.18 open, change your GPU to 1080p.  Report your experience and TIA.
HOW TO - Kodi 2D - 3D - UHD (4k) HDR Guide Internal & External Players
W10/1909 MPC-BE\HC PDVD19 DVDFab3&5 KODI 19 PotPlayer 960-4GB/RGB 4:4:4/Desktop=60Hz/Video=Matched Refresh rates 8/12bit/65JS8500 UHD HDR 3D
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Messages In This Thread
RE: Kodi 3D Guide - by brazen1 - 2015-06-15, 22:20
RE: Kodi 3D Guide - by brazen1 - 2015-06-15, 22:29
RE: Kodi 3D Guide - by michaelsammler - 2015-06-22, 00:38
RE: Kodi 3D Guide - by brazen1 - 2015-06-23, 17:15
RE: Kodi 3D Guide - by michaelsammler - 2015-06-24, 02:23
RE: Kodi 3D Guide - by brazen1 - 2015-06-24, 17:22
RE: Kodi 3D Guide - by michaelsammler - 2015-06-25, 09:26
HELP! - by brazen1 - 2018-08-22, 18:50
RE: HELP! - by zxaura1 - 2018-08-24, 09:32
RE: HOW TO - Kodi 2D - 3D - UHD (4k) HDR Guide Internal & External Players - by brazen1 - 2018-09-26, 16:48
Problem with DXVA scaling videos - by obstler - 2018-10-27, 10:13

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