A laptop drive will probably not play more than two HD ProRes files at once.  An external Firewire or USB drive might help if half the clips are on it and the other half on the internal.

Auto can play at any speed forward or backward: try 'rate -1' or 'rate 1.5'  etc.  That sets the Quicktime clock for playback to that rate.  It's more efficient to let QT do the tasking internally.  

You can select the starting frame of playback using the frame number into the second inlet.

On Sun, Mar 3, 2013 at 2:34 PM, Stephan Elliot Perez <dreamoftheshoreofanotherworld@gmail.com> wrote:
I am not using the auto message because I often want to play the files backwards or only play a certain part of them. Unless there is a variant of auto for this?

When I use the patch for a performance it will be on a laptop, which I am not certain will have multiple hard drives. Would a solid state drive definitely fix my problem? Otherwise, I suppose I will be stuck with a lower resolution for the videos.

-Stephan


On Sun, Mar 3, 2013 at 7:22 PM, chris clepper <cgclepper@gmail.com> wrote:
Are you using 'auto 1' to play the files?  That uses Quicktime to determine the current position which is more efficient than sending a frame number.  You may also want to try 'frame 60' into the gemwin with the auto message for smoother looking output.  That basically syncs the render output with the screen and 'auto 1' only loads a new frame at the rate of the file.

Those CPU figures seem about right.  The ProRes HQ files are probably much larger on disk than the AIC files, so the extra CPU time might be waiting for the disk.  That might also be why the AIC files spike at certain points because the drive is working more.  Disk speed is an important factor here: I would spread the files over multiple drives if possible. Obviously, SSD is a good option too.

Chris

On Sun, Mar 3, 2013 at 1:05 PM, Stephan Elliot Perez <dreamoftheshoreofanotherworld@gmail.com> wrote:
So, I added the -nomidi -noaudio and -nrt commands as instructed by Mr. Clepper. This seems to help stop lag in Pure Data itself (so cues are executed punctually) when using HD-files.
       However, I then converted my files to 1920 x 1080 at 100% using the prores 422 (HQ) codec. The CPU load still climbs to into the 80s and 90s (even over 100 once) with two videos and into the 120s-160s with three.
       Oddly, with the Intermediary Codec, the load is sometimes much lower (in the 50s for two files) but sharply climbs at other moments (higher than with the pro-res codecs).
      
-Stephan



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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