[PD] file format for GEM

[Cyrille Henry]

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

>
>
> On Tue, Feb 26, 2013 at 10:16 PM, Cyrille Henry <ch at chnry.net <mailto:ch at 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 at residuum.org <mailto:thomas at residuum.org> <mailto:thomas at residuum.org <mailto:thomas at 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>
>
>              Hth,
>              Thomas
>              --
>              "Spielen Sie Strip Schnipp-Schnapp?" (Adam Weishaupt to Johann
>              Wolfgang von Goethe in: Robert Shea & Robert A. Wilson, The Golden
>              Apple)
>         http://www.residuum.org/
>
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