Some aside comments: I see that you are using an RTX 2070. I’ve personally used refresh rate matching on an RTX 2060 without issue. Also I noticed that you are using 1440p output but your display at least appears to advertise that it is 4k. Is 1440p the native resolution of the display? If not, you may want to switch to the native resolution in general. Also the RTX 2070 is more than capable of handling much higher video quality profiles than you currently have set (Settings → Video → Video Playback Quality)
Those comments aside, I don’t see anything obvious in the logs which could be leading to stuttering video. It is possible that the stutter is actually present when you are using the 60Hz output but just masked by the fact that the display refresh rate is over twice the content frame rate and thus making it less visible.
Some thing that you may want to try out:
- Have you changed things in the Nvidia settings? Possibly something like GSync or similar?
- With my RTX 2060, I had to change power management mode to prefer performance or it would randomly drop audio frames (HTPC Tips and Tricks - #5 by gbooker02). Maybe this is worth a shot in your case.
- Try playing in the standalone MPV (mpv.io | Installation). It will not change refresh rates for you so you will need to do this manually in testing.
