Re: [PD] file format for GEM

What is a shader, and how do I use it?

On Wed, Feb 27, 2013 at 7:25 PM, Cyrille Henry ch@chnry.net wrote:

Le 27/02/2013 19:17, Stephan Elliot Perez a écrit :

Thanks, it works now. For some reason, turning "auto" on and off (with

...

pix_film) causes the video to lag temporarily, but I do not have this problem if I use line-objects to go through the frames. The cpu-usage goes above 100 if I have more than two videos playing at once, but I suppose I don't need more than two for this project...

Also, what can I do if I want an additive blend instead of a normal cross-blend?

i would use a shader for this. it offer great flexibility, even if it's a bit harder to begin with. but that's the way openGL wants you to do now. cheers c

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On Tue, Feb 26, 2013 at 10:16 PM, Cyrille Henry <ch@chnry.net mailto: ch@chnry.net> wrote:

hello,
Gem is mostly design to work on the GPU, and not on the CPU.
GPU have hundreds of core, they are faster than CPU for image

manipulations.

pix_add come from the 20th century and should now be avoid since it

use cpu not gpu ;-)

in order to make a fade transition between 2 videos, you can use

transparency on one video. add a [alpha] object after Gemhead, and send number between 0 and 1 in the last inlet of the colorRGB object to make the video appear / disapear.

cheers
c


Le 26/02/2013 21:33, Stephan Elliot Perez a écrit :

    Hello,
             So, looking at the help file for [pd~], it seems to be

primarily for audio. How can I use multiple cores to work purely with GEM? I am trying to have a simple transition between video clips, but if I have two instances of pix_film and then connect them to pix_add, the CPU-ussage skyrockets well above 100... is there a more efficient object for blending two video clips?

    Best regards,
    Stephan

    On Sun, Feb 3, 2013 at 10:54 PM, Thomas Mayer <

thomas@residuum.org mailto:thomas@residuum.org <mailto: thomas@residuum.org mailto:thomas@residuum.org>> wrote:

         Hi,

         On 03.02.2013 22:48, Stephan Elliot Perez wrote:
          > I am talking about PD's CPU meter. I don't have the

impression that PD > takes full advantage of 2 quad-core processors. When processing audio, > anything over 100 in PD's meter will lead to glitched audio. I am just > wondering if it will be much more when I load other videos and transition > between them.

         Pd will only use one core, and one core for the GUI. There

are ways to distribute the load over several cores, e.g. [pd~] or use several instances of Pd that communicate with each others:

    http://www.mail-archive.com/__**pd-list@iem.at/msg33319.html<http://www.mail-archive.com/__pd-list@iem.at/msg33319.html><

http://www.mail-archive.com/**pd-list@iem.at/msg33319.htmlhttp://www.mail-archive.com/pd-list@iem.at/msg33319.html

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         Hth,
         Thomas
         --
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