[PD] GEM great framerate instability unless -noaudio
cyrille henry
ch at chnry.net
Fri Feb 26 18:17:10 CET 2010
Matteo Sisti Sette a écrit :
> Hi,
>
> On my Vista machine, I get an enormous instability of the framerate with
> Gem, even if dsp is switched off. However, if I run PD with the
> "-noaudio" flag, then the framerate is perfectly stable.
>
> Is it normal?
>
> When I say "enormous" I mean the time elapsed between a frame and the
> next one often goes below one millisecond and above 80ms, though an
> avarage of 40ms is always maintained.
wow.
look like windows is still not very good with real time applications.
try upgrading to a better OS.
with linux, i don't have anything under 32, and nothing above 42.
>
> I am testing this with the attached patch, which has only a gemhead and
> a [realtime], so there's no actual processing of image or video.
>
> If anyone doubts that it can be just the time shown by [realtime] that
> is unreliable,
i do trust realtime.
> note that if I run Pd with -noaudio the measured
> framerate actually _is_ much more stable (rarely below 37ms or above
> 43ms a frame) and also, I have tried it with a simple video (homer.avi)
> and I could note the jerky playing.
>
> Isn't it strange that turning off DSP does not change anything while
> running Pd with -noaudio does??
no.
-noaudio is not the same thing than dsp off.
cyrille
>
> thanks
> m.
>
>
>
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