[PD] 2 Gem questions

Ti Bo tim at timesup.org
Tue Apr 26 14:58:27 CEST 2005

we have an installation using two PD/Gem instances running in parallel
on one machine. each one has a gemwin and one does sound at the
same time. they communicate over OSC.

it works fine: old doco on:


new must come sooooooooonnnn


On Apr 25, 2005, at 6:50 PM, derek holzer wrote:

> In regards to part 2, have you tried either using the -rt flag for PD 
> (may require sudo or root, depending on your config) or using JACK? 
> The first solution (realtime) often fixes many click problems. 
> Otherwise, you might also make sure your video card is properly set 
> up. Type "glxinfo" and look for the line:
> direct rendering: Yes
> to see if OpenGL is properly set up for your graphics card. If it 
> isn't then all your 3D is being rendered by the CPU, which takes a lot 
> more cycles then if it is rendered on the card.
> With this in mind, it might actually be easier on your system to 
> render your OpenGL graphics at the same time as doing your sound, 
> assuming your sound and video is properly configured, as video 
> playback (espc decoding) requires much more CPU than OpenGL.
> d.
> Oded Ben-Tal wrote:
>> 1) is there a way to generate a file (in whatever video format) from 
>> gem graphics?
>> 2) I get clicks when playing sound while also doing graphics. 
>> Playback (using sfplay~) is fine if I'm not rendering graphics. I'm 
>> running RH9 (planetCCRMA) with an m-audio soundcard. I'm not using 
>> Jack just alsa. The first question is in part a way to bypass problem 
>> 2 i.e. can I generate the graphics into a file and than mix it with 
>> the sound separately.
> -- 
> derek holzer ::: http://www.umatic.nl
> ---Oblique Strategy # 7:
> "Accept advice"
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