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strange video stuttering problem

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TheShoe:
Have a strange issue:

Built a new HTPC, fresh install of Windows 10 Pro 2004, nVidia 1650S GPU (latest drivers), 8GB system memory, stock version of madVR (installed by Media Center).

My media is fed over hard-wire Gb ethernet and I've measured consistent > 100MB/s transfer speed; local content produces same issue.  I've tried hardware decoding in the settings too - makes no difference.  CPU is 4Ghz, and GPU mem consumption is ~2GB during decoding/playback.

configured to use RO HQ:

If I run at 60Hz always, all video plays back perfectly - no issues with stuttering, no visible issues that I can see

If I configure Media Center to do refresh rate switching, to 23, 24, 30, etc... depending on source, I get video stutter during playback.

madVR shows 0 dropped frames and acceptable rendering times, queues are full, and no matter the processing/scaling settings it happens.

If I go RO STD, I don't see stutter, but of course I lose out on things like HDR.

Not sure why locking to 60Hz would prevent this and I'm inclined to leave it that way since it produces no visible artifacts that we can detect while watching various mixed content; however it is counter to how my other HTPC is configured (which uses an nVidia 1080Ti)

I've canvassed as many posts I can find on this topic for Media Center (and there are many through the years) - nothing suggested has an impact.

Since RO HQ @ 60Hz seems fine, I'm inclined to leave it that way.  But curious if there are other things to try/look at.

Note that I have no anti-virus other than what Windows provides OOTB

tij:
Can you post MadVR OSD on one of the mode that cause stuttering?

PS ... stupid question, but to get it out of the way - does your TV support those frame rate

PSS ... which Windows 10 version you running?

TheShoe:
Will grab a snapshot of madVR and post later.

Re: TV - it's an LG OLED 2016 4K set (same as yours I believe).

Windows version is Win10 Pro, 2004 (latest updates applied)

tij:
I havent jump to 2004 yet

but i read it include setting for monitor refresh rate (supposed to fix flickering on system running multiple monitors with different refresh rate)

have a look what settings is set there (maybe it is set on 60Hz ... if i remember correctly LG OLED are 120Hz)

Edit: mayby play around with that setting ... see if it fixes stutering

Edit2: might be the reason 3D has problem too ... if refresh rate set to something incompatible, system might not be able to go to 23fps ... as a result GPU cannot switch to 3D (3D in MadVR only works up to 1080p24) ... just a wild guess as i am not on 2004, so cannot test

TheShoe:
Attached an image of madVR OSD.

IGNORE the Dropped Frame count as I neglected to reset it.  All video has a few dropped frames when it begins playback.  Trust me that it does not drop once playback has been going a few seconds.

So in any case, on this card, locking to 60Mhz prevents any sort of stutter; anything else there is stutter.  I actually dropped down to a lower driver version to fix the HDR issue in latest nVidia drivers (HDR is stuck "on" after watching an HDR encoded video).

-

Some other differences between my two HTPCs:

1: The older HTPC with no issues with the 1080Ti is running a driver 445.75 which can no longer be downloaded.

2: The LG OLED set for the second/new HTPC with the 1080Ti is on a lower firmware.  The LG OLED for the new HTPC with the 1650S is on a newer firmware.  No idea if that has an impact, and I must have had auto-update on as I typically don't update firmware without some very compelling reason to do so.

So there are other differences in the stack.

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