[PD] synchronised video outputs

[Jaime Oliver]

hi ben,
what mpeg decoder cards with 4 outputs from the same machine are you
refering to? I will need to get something like that for an installation, but
don't really know much about it.

best,

J

On Mon, Feb 25, 2008 at 8:47 AM, B. Bogart <ben at ekran.org> wrote:

> Check out Jaromil's ivysync, which uses those mpeg decoder cards for
> synced output. I think you can do 4 outputs from the same machine, but
> I'm not sure if that is a software limit, or just the number of slots
> available for those cards. Jaromil did mention something about a network
> sync feature also.
>
> As far as I know these decoders are all only 640x480, I imagine the ones
> working on linux certainly are.
>
> .b.
>
> marius schebella wrote:
> > I am also working on a project like this (with thomas grill, who solved
> > many problems before I even thought of them...). in principle
> > synchronisation works fine.
> > now your may ask why do other people pay so much money for expensive
> > hardware?
> > the problem lies in details: first resolution: for some cases you want
> > to go with the highest available resolution 1080p (and in the future
> > even more), and suddenly you will see small appearance of jitter, mostly
> > because quicktime is different inside a quicktime player and outside
> > quicktime, also because in most cases you have to convert color formats.
> > then, compensating a drift without losing frames is very tricky.
> > from my experience so far, Pd solutions only work up to 720p and only if
> > you use a drift compensating algorithm - sending a bang for every frame
> > over the network always causes jitter (although you may not notice).
> > It is no big effort to try a pd version and see if you are happy with
> it.
> > marius.
> >
> > altern wrote:
> >> hi
> >>
> >> I need to have several video outputs that run in sync. A friend who
> >> works in a art exhibition space told me there would be couple of
> >> solutions for this but both involve buying pretty expensive equipment
> >> like special DVD players.
> >>
> >> I thought then that a solution for this issue could be to have several
> >> computers on a local network playing video (with GEM) and synchronise
> >> them via OSC. But I dont have any experience doing such a thing, never
> >> used OSC for anything similar. Also I dont have a clue about how to
> >> synchronise together videos.
> >>
> >> Has anyone done anything similar? any experiences to share?
> >>
> >> thanks!
> >>
> >> enrike
> >>
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-- 
Jaime E Oliver LR

joliverl at ucsd.edu
www.realidadvisual.org/jaimeoliver
www-crca.ucsd.edu/
www.realidadvisual.org

9168 Regents Rd. Apt. G
La Jolla, CA 92037
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