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Asked: 2026-05-25T01:47:50+00:00

I am trying to calculate a video framerate in a program. To do this

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I am trying to calculate a video framerate in a program. To do this I take

DateTime.Now

at the beginning of a stream, and then again after every frame whilst also incrementing a framecounter.

Then I calculate the FPS like so:

int fps = (int)(frames / (TimeSpan.FromTicks(CurrentTime.Ticks).Seconds - TimeSpan.FromTicks(StartTime.Ticks).Seconds));

The problem is that I occassionally get a negative number out, meaning the start time must be later than the current time. How can this be the case? Does anyone know anough about these functions to explain?

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1 Answer

  1. Editorial Team

    The datetime functions are probably not precise enough for your needs, you may want to look into performance counters instead. I think the StopWatch class is what your looking for. System.Diagnostics.StopWatch. that is using the QueryPerformanceFrequency and QueryPerformanceCounter functions for the timing.

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