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about framerate accuracy (Read 446 times)
broc
about framerate accuracy
Nov 11th, 2006, 11:24am  
For running Processing in sync with other applications I was curious about the framerate accuracy. So I did a simple test using millis() to measure the time of running x frames at framerate x. Obviously this should be 1sec=1000 ms.

For some framerates (x=20,50,100) the time was actually 1000ms (+/-1ms) but for others I've got quite different values, for example x=30->990ms, x=60->960ms (!). This difference of 4% means about 5secs in 2 minutes. Interestingly the deviations seem to be "accurate" insofar as the jitter again is only +/-1ms.

So I'm puzzled by the results. Am I doing something wrong? Can somebody confirm these values and/or explain this behaviour?
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