<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>Hello!<br/></div><div><br/></div><div>what video codec are you using?<br/></div><div>in my experience, a big issue when playing back video with gem,<br/></div><div>comes from the codecs and container, resulting in extreme differences in cpu-load.<br/></div><div>i found, that mov-container work way better than avi-container, even though<br/></div><div>the same codec is used and packed in the container.<br/></div><div>try converting your videos to a motion-jpeg codec packed in a quicktime-mov.<br/></div><div>you could use mpeg-streamclip [1] for that purpose on win /mac machines or ffmpeg on linux.<br/></div><div><br/></div><div>[1] http://www.squared5.com/ free tool for video conversion<br/></div><div><br/></div><div>regards, peter <br/>
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<b>Gesendet:</b> Mittwoch, 27. Februar 2013 um 23:55 Uhr<br/>
<b>Von:</b> "Stephan Elliot Perez" <dreamoftheshoreofanotherworld@gmail.com><br/>
<b>An:</b> "Cyrille Henry" <ch@chnry.net><br/>
<b>Cc:</b> pd-list@iem.at<br/>
<b>Betreff:</b> Re: [PD] file format for GEM
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A more urgent problem: Although the CPU usage stays under 100 (peak is around 84 with three videos overlapping), there is a substantial amount of lag. If I turn off video processing, a command that should be executed after 30 seconds via the cue list is executed punctually. If I turn it on, the command is 11 seconds late.<br/>
<br/>I can attach the patch if you like, but I probably will not be able to send the video clips as one attachment.<br/><br/>Best regards,<br/>Stephan<br/><br/><br/><div class="gmail_quote">On Wed, Feb 27, 2013 at 8:19 PM, Stephan Elliot Perez <span><<a href="dreamoftheshoreofanotherworld@gmail.com" target="_parent">dreamoftheshoreofanotherworld@gmail.com</a>></span> wrote:<br/>
<blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex;border-left: 1.0px rgb(204,204,204) solid;padding-left: 1.0ex;">What is a shader, and how do I use it?<div class="HOEnZb"><div class="h5"><br/><br/><div class="gmail_quote">On Wed, Feb 27, 2013 at 7:25 PM, Cyrille Henry <span><<a href="ch@chnry.net" target="_parent">ch@chnry.net</a>></span> wrote:<br/>
<blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex;border-left: 1.0px rgb(204,204,204) solid;padding-left: 1.0ex;"><br/>
<br/>
Le 27/02/2013 19:17, Stephan Elliot Perez a écrit :<div><br/>
<blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex;border-left: 1.0px rgb(204,204,204) solid;padding-left: 1.0ex;">
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...<br/>
<br/>
Also, what can I do if I want an additive blend instead of a normal cross-blend?<br/>
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i would use a shader for this.<br/>
it offer great flexibility, even if it's a bit harder to begin with.<br/>
but that's the way openGL wants you to do now.<br/>
cheers<br/>
c<br/>
<br/>
<blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex;border-left: 1.0px rgb(204,204,204) solid;padding-left: 1.0ex;"><div>
<br/>
<br/>
On Tue, Feb 26, 2013 at 10:16 PM, Cyrille Henry <<a href="ch@chnry.net" target="_parent">ch@chnry.net</a> <mailto:<a href="ch@chnry.net" target="_parent">ch@chnry.net</a>>> wrote:<br/>
<br/>
hello,<br/>
Gem is mostly design to work on the GPU, and not on the CPU.<br/>
GPU have hundreds of core, they are faster than CPU for image manipulations.<br/>
<br/>
pix_add come from the 20th century and should now be avoid since it use cpu not gpu ;-)<br/>
<br/>
in order to make a fade transition between 2 videos, you can use transparency on one video.<br/>
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.<br/>
<br/>
cheers<br/>
c<br/>
<br/>
<br/>
Le 26/02/2013 21:33, Stephan Elliot Perez a écrit :<br/>
<br/>
Hello,<br/>
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?<br/>
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?<br/>
<br/>
Best regards,<br/>
Stephan<br/>
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On Sun, Feb 3, 2013 at 10:54 PM, Thomas Mayer <<a href="thomas@residuum.org" target="_parent">thomas@residuum.org</a> <mailto:<a href="thomas@residuum.org" target="_parent">thomas@residuum.org</a>> <mailto:<a href="thomas@residuum.org" target="_parent">thomas@residuum.org</a> <mailto:<a href="thomas@residuum.org" target="_parent">thomas@residuum.org</a>>>> wrote:<br/>
<br/>
Hi,<br/>
<br/>
On 03.02.2013 22:48, Stephan Elliot Perez wrote:<br/>
> I am talking about PD's CPU meter. I don't have the impression that PD<br/>
> takes full advantage of 2 quad-core processors. When processing audio,<br/>
> anything over 100 in PD's meter will lead to glitched audio. I am just<br/>
> wondering if it will be much more when I load other videos and transition<br/>
> between them.<br/>
<br/>
Pd will only use one core, and one core for the GUI. There are ways to<br/>
distribute the load over several cores, e.g. [pd~] or use several<br/>
instances of Pd that communicate with each others:<br/>
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<br/>
<br/>
Hth,<br/>
Thomas<br/>
--<br/>
"Spielen Sie Strip Schnipp-Schnapp?" (Adam Weishaupt to Johann<br/>
Wolfgang von Goethe in: Robert Shea & Robert A. Wilson, The Golden<br/>
Apple)<br/>
<a href="http://www.residuum.org/" target="_blank">http://www.residuum.org/</a><br/>
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