[PD] synchronised video outputs

[_ Discos Invisibles]

How about GEM working the sync on a extended screen and a Matrox TripleHead2Go. It gives you three displays + your laptop screen (would not give you an extra on a desktop). Is external so you don't need a slot on your computer and is very cheap (around $300). This is the most basic solution, is this what you need?
Saludos.

N/


  ----- Original Message ----- 
  From: Jaime Oliver 
  To: B. Bogart 
  Cc: the PureData - mailinglist ; marius schebella 
  Sent: Monday, February 25, 2008 9:40 PM
  Subject: Re: [PD] synchronised video outputs


  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
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