Verify using DOSBox 0.74-3
Use output=opengl

Thanks, it works smoothly. But... when using output=opengl the picture is 'a bit blurred' in fullscreen, while using output=overlay the picture is 'purely pixelated'.
I prefer it pixelated. Any way I can play this in Windows 10?
I'm using DOSBox 0.74-3 both in Windows 10 and Windows 7.
Can you reproduce the issue? [ output=overlay + fullscreen works smoothly in Windows 7, but video and audio stuttering in Windows 10 on the same computer ]

Use output=openglnb.

Thanks! It works.
I wonder what's caused this issue. Maybe a problem with Windows 10 scaling?

I've had problems with DOSbox getting stuttery when running EVGA - Precision X or MSI afterburner I don't remember which one. I think it had something to do with limiting the framerate using that software...don't know if that has anything to do with your issue though...

I don't think it's my case. I only use the NVIDIA drivers (latest version and default settings).
I have another problem with Windows 10. I use Firefox (latest version) and I get frame drops playing YouTube videos at 1440p60 and 2160p (VP9 codec) . Disabling WebRender didn't help. With Windows 7 I can play the same videos smoothly (same Firefox version). VLC media player can play them smoothly, no matter if I use Windows 7 or 10.

wise.jo wrote on 2020-01-17, 14:58:

Thanks! It works.
I wonder what's caused this issue. Maybe a problem with Windows 10 scaling?

Well GDI and ddraw are deprecated so likely some combination of DWM, WDDM, updated drivers....more likely the updated drivers aren't tested sufficiently with gdi and ddraw anymore. This is something that needs to be brought up more with driver manufacturers but they couldn't care less so wrapper solutions are likely our best bet for those programs that can't be recompiled.

You can try the same video driver from Windows 7 and see if that makes a difference. If it does then submit a bug report to Nvidia and or the firefox team.