[PD] tight syncing of two pd machines...
ben at ekran.org
Tue Dec 16 15:47:46 CET 2003
I need to do some syncing, but not sample accurage, 1/60th of a second would
be sufficient I think.
Do I need to worry about jitter? What delay size is commonly needed for
----- Original Message -----
From: "Hans-Christoph Steiner" <hans at eds.org>
To: "joreg" <joreg at gmx.at>
Cc: "Josh Steiner" <josh at vitriolix.com>; <pd-list at iem.kug.ac.at>
Sent: Tuesday, December 16, 2003 4:19 AM
Subject: Re: [PD] tight syncing of two pd machines...
> Well, if you can get the timetag aspect of OSC working, then it would
> be good. You just need to set the delay on the OSC timetags to be
> greater than the jitter, then it will be reliable (as reliable as your
> computer's clock). That is, of course, depending on implementation.
> Many if not most OSC implementations do not do timetags, AFAIK.
> On Wednesday, Dec 3, 2003, at 13:43 Europe/Brussels, joreg wrote:
> > halo.
> > in a recent setup i had to sync a pc that generated sounds to another
> > that did the visuals. all tests with udp or tcp connections were
> > unsatisfying. the beat was not received constantly on the other
> > machine. now i do it with midi and am happy. i didn't measure anything
> > but a jitter is no longer obvious.
> > osc will not be better than netsend via udp since it still uses udp.
> > grkks.
> > joreg.
> > JS> does anyone have any good experience getting *very* tight timing
> > sync
> > JS> between two computers running pd? for my first attempt i just used
> > JS> [netsend]/[netreceive] to send a message (the number of the current
> > JS> measure) and got really nasty jitter (10's of ms). last night i
> > banged
> > JS> out a little net latency test patch and the results were so bad i
> > JS> decided i was tired and it must be a problem with my code ;)
> > JS> so... how have you achieved tight timing sync? should i give up on
> > JS> network sync and just use a midi cable? how about OSC?
> > --cut here-------------------
> > current: http://vvvv.meso.net
> > allstar: http://joreg.ath.cx
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