[PD] Gem and audio, multiprocessors, Mac

[Max]

i tried both, audio definetly must be in the main process, not the pd~ process.
see those patches where various techniques are described:
http://www.uni-weimar.de/medien/wiki/Audiovideo

m.

Am 07.12.2011 um 11:52 schrieb Jean-Marie Adrien:

> Hi list,
> 
> Is there a strategy to optimize GEM video processing and real time audio on a single Mac using pd~  :
> 
> Audio in subprocess or in main process ?
> Any startup flags ? chmod +s stuff ? shm settings ?
> Run two instances of PD with messages between them ?
> Subprocess fifo size ?
> 
> The idea would be to give a priority to sound versus video, if absolutely necessary.
> 
> Situation :
> 
> On a single Mac (pro or mini), Gem (pix_video &  tracking, ordinary resolution and fps) and real time audio (10 channels, mainly reading from disk), dispatched on four processor cores via pd~. The sound is generated in the subprocess (big latency 512), the video in the main patch. pd-extended 42.5 osX 10.7 &10.6, gem 93, 92. 
> 
> Problem :
> 
> Sound is distorted when Gem is rendering, and becomes immediatly perfect when stopping rendering (destroying the gem window).
> Processors seem ok (each core at 75%).
> 
> 
> Sticking with this problem for a couple of months, 
> Looked around in archives but didn't find any clear element.
> 
> 
> Thanks
> JM
> 
> 
> 
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