On Sun, Mar 3, 2013 at 10:10 AM, Peter Venus <news@petervenus.de> wrote:

Hello!
i did not know, that you wanted to playback HD-material.
with HD material, i notice problems as well, also with the mjpeg codec.

anyone having experience with fullHD and other codecs?

under OSX i found, that apples ProRes 422 codec works best for that matter. The only thing being, that its comes with final cut.
right now, i am running a show, where i use mjpeg in 720p resolution with no problems for simultaneous playback of 3 videos.

cheers, peter

Am 01.03.13 21:39, schrieb Stephan Elliot Perez:

So, I reduced the resolution of the files from 1920 x 1080 to 800 x 450
with the Apple Photo -Jpeg codec and now I have no lag.

The loss in quality is of course noticable, but tolerable...

Thanks again for you help,
Stephan

On Thu, Feb 28, 2013 at 9:13 AM, <news@petervenus.de> wrote:

Hello!

what video codec are you using?
in my experience, a big issue when playing back video with gem,
comes from the codecs and container, resulting in extreme differences in
cpu-load.
i found, that mov-container work way better than avi-container, even though
the same codec is used and packed in the container.
try converting your videos to a motion-jpeg codec packed in a
quicktime-mov.
you could use mpeg-streamclip [1] for that purpose on win /mac machines or
ffmpeg on linux.

[1] http://www.squared5.com/ free tool for video conversion

regards, peter

*Gesendet:* Mittwoch, 27. Februar 2013 um 23:55 Uhr
*Von:* "Stephan Elliot Perez" <dreamoftheshoreofanotherworld@gmail.com>
*An:* "Cyrille Henry" <ch@chnry.net>
*Cc:* pd-list@iem.at
*Betreff:* Re: [PD] file format for GEM

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.

I can attach the patch if you like, but I probably will not be able to
send the video clips as one attachment.

Best regards,
Stephan

On Wed, Feb 27, 2013 at 8:19 PM, Stephan Elliot Perez <
dreamoftheshoreofanotherworld@gmail.com> wrote:

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

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.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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