[PD] synchronised video outputs

[B. Bogart]

Check out the project page:

http://sync.dyne.org/?info=description

looks like ivyTV cards are supported.

.b.



Jaime Oliver wrote:
> 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
> <mailto: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 <mailto:joliverl at ucsd.edu>
> www.realidadvisual.org/jaimeoliver
> <http://www.realidadvisual.org/jaimeoliver>
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