Re: Clarification about [pd~]

I am grateful for this kind community

Pier

Il giorno sab 29 mar 2025 alle ore 12:13 Miller Puckette via Pd-list <
[email protected]> ha scritto:

>
> There are two possible sources of dropouts because of gem: first, gem
> might run at less that 100% CPU usage but since itits calculations
> happen only once per frame,  the computation time is irregular and can
> be smoothed out by using pd~ with a long-ish fifo size.  This allows the
> sub-process to get behind on computation and later catch up as the fifos
> run out and refill.
>
> Second, it could be that the gem patch sometimes runs at greater than
> 100%.  In this case you can either allow it to get behind (I think this
> will not just slow down the frame rate but also slow down pd's clock so
> that sequences might also slow down) -- or else you can slow gem's frame
> rate down until the computations fit -- and then you can go back to case 1.
>
> cheers
> Miller
>
> >
> > Hi, List !
> >
> > I stumbled over one question recently, regarding [pd~].
> >
> > PD (with Audio operations) and PD with video (GEM) are best run in 2
> > seperate instances of PD, right ? (As video operations can cause audio
> > dropouts)
> >
> > So, given these informations about [pd~], running a GEM patch inside
> > an audio PD patch using [pd~) is not going to be better than having
> > audio and video in the same patch, right ? (because [pd~] is
> > synchronous to its parent)
> >
> > So, for an "asynchronous" situation, i still need to start two
> > seperate instances of PD to keep audio and video truly seperated ?
> >
> > Thanks for clarifications !
> >
> > Best
> >
> > Oliver
> >
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