hi ben,<div><br class="webkit-block-placeholder"></div><div>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.</div>
<div><br class="webkit-block-placeholder"></div><div>best,</div><div><br class="webkit-block-placeholder"></div><div>J<br><br><div class="gmail_quote">On Mon, Feb 25, 2008 at 8:47 AM, B. Bogart <<a href="mailto:ben@ekran.org">ben@ekran.org</a>> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Check out Jaromil's ivysync, which uses those mpeg decoder cards for<br>
synced output. I think you can do 4 outputs from the same machine, but<br>
I'm not sure if that is a software limit, or just the number of slots<br>
available for those cards. Jaromil did mention something about a network<br>
sync feature also.<br>
<br>
As far as I know these decoders are all only 640x480, I imagine the ones<br>
working on linux certainly are.<br>
<font color="#888888"><br>
.b.<br>
</font><div><div></div><div class="Wj3C7c"><br>
marius schebella wrote:<br>
> I am also working on a project like this (with thomas grill, who solved<br>
> many problems before I even thought of them...). in principle<br>
> synchronisation works fine.<br>
> now your may ask why do other people pay so much money for expensive<br>
> hardware?<br>
> the problem lies in details: first resolution: for some cases you want<br>
> to go with the highest available resolution 1080p (and in the future<br>
> even more), and suddenly you will see small appearance of jitter, mostly<br>
> because quicktime is different inside a quicktime player and outside<br>
> quicktime, also because in most cases you have to convert color formats.<br>
> then, compensating a drift without losing frames is very tricky.<br>
> from my experience so far, Pd solutions only work up to 720p and only if<br>
> you use a drift compensating algorithm - sending a bang for every frame<br>
> over the network always causes jitter (although you may not notice).<br>
> It is no big effort to try a pd version and see if you are happy with it.<br>
> marius.<br>
><br>
> altern wrote:<br>
>> hi<br>
>><br>
>> I need to have several video outputs that run in sync. A friend who<br>
>> works in a art exhibition space told me there would be couple of<br>
>> solutions for this but both involve buying pretty expensive equipment<br>
>> like special DVD players.<br>
>><br>
>> I thought then that a solution for this issue could be to have several<br>
>> computers on a local network playing video (with GEM) and synchronise<br>
>> them via OSC. But I dont have any experience doing such a thing, never<br>
>> used OSC for anything similar. Also I dont have a clue about how to<br>
>> synchronise together videos.<br>
>><br>
>> Has anyone done anything similar? any experiences to share?<br>
>><br>
>> thanks!<br>
>><br>
>> enrike<br>
>><br>
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