Question / Help Limiting FPS causes preview/recording stutter

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Bramblejack

New Member
Technically the title says it all, but to be more precise, here's what's happening. Basically, I'm trying to record at 50FPS (I know, a weird number, but that is to leave some GPU overhead while still having somewhat smooth footage). For this purpose I forced my display to be 50Hz in the nVidia Control Panel. Limiting my framerate to 50 with RTSS with either V-Sync on or off causes the recording and the preview to stutter and it is not related to GPU/CPU overload as I don't see any dropped frames in the stats. The game's are running fine. The only solution I found is to use V-Sync as the only framerate limiter instead, but the input lag is just unbearable.

For the recording settings I use new NVENC at CQP 15 with Look-ahead and Psycho Visual Tuning enabled (but the settings don't seem to matter in this case).

I don't see how limiting the framerate could cause the stutter, especially with RTSS which also evens out the frame time (I get 20.0ms frame time at 50FPS all the time). I tried different capture methods and all I can say is that different games will record better on one and not the other, but all in all they will stutter at some point.

As of writing this post I had an idea - would forcing the V-Sync on OBS application and RTSS to limit the FPS of the preview would actually make the difference?
 
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Bramblejack

New Member
Disabling RTSS did not help, neither did recording in 60FPS, the stutter appears after some time, game capture has it mostly random, while screen capture happens to get it every few minutes, only thing different is it seems to happen less frequently (but it might be subjective). I even ran a simple V-Sync test at https://www.vsynctester.com/ and recorded it with screen capture to make sure my GPU or CPU are not throttling or anything. Throughout the few minutes that I recorded there was a stutter that was slowly building up to the point where the framerate just basically halved while the whole test ran smooth during that time.

Does this have something to do with my refresh rate of the monitor? When I set it to 60Hz, checking it through https://www.displayhz.com/ tells me it's around 59.997Hz. Could such small fractional difference be the case?

About the logs, I said I'd post, I ran them through OBS Log Analyzer and there's not a single issue. I tested two more versions, 22.0.2 (which supposedly someone had it working while having a similar issue) and the new 24.0 RC, but no difference for me.
 
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