Damn. i'll have to chalk this up to using Windows 10 on a late 2014 model Mac Mini.
I think it's the Intel 5100 chipset and/or the drivers Apple provides.
Perhaps someone will one day try the Intel chipset other than me
pretty much identical issues for me too, using a intel d54250wyk nuc (i5 ~ i3 desktop). Win10, latest HD5000 drivers, latest LAV/MadVR.
It starts OK (in 3D) for about 5 seconds then stutters badly then crashes MC 21 after a minute or two.
OSD report shows the various queues don't fill at all. Tried lowest settings for everything. Plus FSE on/off/D3D11 sync/alternate glitch in all combos. To be fair D3D11 isnt that great for 2D either, CPU/GPU queues need to be larger for smooth playback, but then forward/skip don't work too well.
No hardware acceleration is the key I think Hendrik mentioned earlier.
As a reference, powerdvd 13 works fine. but its powerdvd...