[PD] file format for GEM
Peter Venus
news at petervenus.de
Sun Mar 3 10:10:39 CET 2013
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 at 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 at gmail.com>
>> *An:* "Cyrille Henry" <ch at chnry.net>
>> *Cc:* pd-list at 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 at 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 at 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 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><
>>>>> 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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>>>>>
>>>>>
>>>>>
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>>>>>
>>>>>
>>>
>>
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