[PD] synchronised video outputs

[B. Bogart]

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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