Pd-list February 2007

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148 participants
295 discussions

gem: framerate / quality of pix_video with dv and linux
by Thoralf Schulze 08 Feb '07

08 Feb '07

hi there, when capturing dv with the linux version of gem's pix_video, this object emits frames about every 1/10th of a second only, no matter what framerate gem is running at. when using an usb camera, the behaviour of pix_video is as expected: it delivers one frame with every render cycle. this is a bit less-than-ideal from my point of view, since fast movements won't be continously anymore. is there any way of changing this behaviour? also, while we are at it: the resulting images are really blocky sometimes, especially when capturing motion. it looks like some parts of the image consist of another frame than the rest of the image ... this issue does not exist when capturing dv with dvgrab or kino. while working on this, i found myself craving for the windows version of pix_video: not only do these ugly blocks not appear, it is also possible to change the resolution of the captured video with messages (dv res xxx, iirc). this becomes important when doing other stuff besides capturing video: pix_video and the according pix_texture take up about 50% on my computer :-( thre is indeed a quality-message, but this one doesn't seem to affect the resolution of the captured frames, only their overall quality. with kind regards, thoralf. ___________________________________________________________ New Yahoo! Mail is the ultimate force in competitive emailing. Find out more at the Yahoo! Mail Championships. Plus: play games and win prizes. http://uk.rd.yahoo.com/evt=44106/*http://mail.yahoo.net/uk

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Re: Flext used with external libs - linux seg faults
by Tim Blechmann 08 Feb '07

08 Feb '07

On Thu, 2007-02-08 at 09:20 +0000, Conor J Curran wrote: > > Tim, are those scons scripts available that mentioned in your previous > mail? i've sent them to thomas, but i guess, he never checked them into cvs ... however, you can try the scons build system from my chaos external: http://pure-data.cvs.sourceforge.net/pure-data/externals/tb/chaos/SConstruct the sconstruct file should integrate with the flext build system, using package.txt and can be extended with a custom.py > I couldn't find anything at your site although I was taking a look > at pnpd which looks very interesting! thanks ;) tim -- tim(a)klingt.org ICQ: 96771783 http://www.mokabar.tk You can play a shoestring if you're sincere John Coltrane

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GEM: no xxf86vm-support
by Fanouris Moraitis 08 Feb '07

08 Feb '07

Hi all, I am using Gem 0.91-cvs Pd version 0.39.2-extended-test7 in Ubuntu 6.10 My graphic card is ATI x300 and the direct rendering is enabled When i send a fullscreen message in gemwin i get the following error error: GEM: no xxf86vm-support: cannot switch to fullscreen any ideas? thanks,

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[PD]OT-What would you name this function?
by Charles Henry 08 Feb '07

08 Feb '07

There's a function I think could be useful for system response measurement: f(x)=sin(pi*(fH-fL)*t)*cos(pi*(fH+fL)*t)/t it's basically the ideal bandpass function, it's fourier transform is 0.5 between fL and fH and 0 everywhere else. There's another related signal, the sinc... but what should this one be called? "cosinc" is already taken--it's the name of the derivative of the sinc. sincos? sounds silly Chuck

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Re: [PD] graphical possibilities in GEM
by Johannes Eckart 08 Feb '07

08 Feb '07

> on 8.feb 2007 Hans-Christoph wrote: > > > Sounds good, but it doesnt' work for me. I get these errors on load: > > > > error: 1007-$2x: no such object > > error: 1007-$2y: no such object > > error: 1007-$2z: no such object > > > > > > .hc > > > > On Feb 7, 2007, at 3:28 AM, Patco wrote: > > > > > Johannes Eckart a Ã©crit : > > >> 3.)One specific question: is there any possibility to work with > > >> fractals or the formulas of them on Gem? maybe any patches exist > > >> already? any hint would be great for me!!! > > >> > > >> > > >> > > > Hello, you might be interested by this attached patch for drawing > > > strange attractors, > > > Patco. Hi again!! Thanks for the new version of the patch compatible with a lower version of pd (my version is 0.38). To upgrade a version, do i just have to install the new one, or do i have to delete the old version of pd before? Thanks, and sorry for the missunderstanding, Patco :$ ! Cheers Johannes -- "Feel free" - 5 GB Mailbox, 50 FreeSMS/Monat ... Jetzt GMX ProMail testen: http://www.gmx.net/de/go/promail?ac=OM.GX.GX003K11711T4781a

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"popping" from - and prepending to - a generic message
by Matteo Sisti Sette 08 Feb '07

08 Feb '07

Hi all, Is there a reasonably stright-forward way in pd-proper (I mean, without externals) to do either of the following two things? 1) Removing the first element of a message (NOT necessarily a list) and returning the rest of the message 2) Prepending a symbol or number to a message But I mean: this must work with ANY message, without knowing its "composition" (whether it starts with a number or symbol, how many "elements" and of what type it has, etc.) For example, let's say I get a message which is [foo 1 2 3( Removing the first element should give me [1 2 3( But if the message is [1 foo 3 4 5 bar( it must give me [foo 3 4 5 bar( and so on. I will omit examples for the "prepend" thing :p Solving problem 1 would indeed allow solving problem 2 (not so "stright forward" though:) Not viceversa, as far as I can see. I came up with a rather tricky solution for (1) but it involves "scripting" (dynamically adding and connecting objects in a canvas by sending it messages) and I'm finding out that PD is quite buggy when you start using that sort of things. When trying to use it to solve problem 2, I ended up with a patch that makes pd crash (but it shouldn't). However, I'm still trying to isolate the bug before I submit it to the bug tracker. Furthermore, the solution to (1) alone works fine but generates some errors in the pd output (because I intentionally use "unpack s" and "unpack f" at the same time so that only one of them matches and produces output). Which by the way raises a secondary question: is there a way to turn off/on error reporting? Also I found an almost as tricky (and not elegant) solution to problem 2 alone, without "scripting" but which requieres the message not to exceed a fixed maximum length (number of "elements"). And it generates "unpack mismatch" error messages too. If anyone is interested I can share the mentioned patches, but first I was wondering if I am missing a much simpler solution. I know there are externals that do this sort of things, but I like doing things natively in pd whenever I can, and this is also a speculative curiosity. Thanks M.

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re: generated objects including $0
by Matteo.sistisette 08 Feb '07

08 Feb '07

Chris McCormick wrote: >On Wed, Feb 07, 2007 at 07:54:40PM -0700, Luke Iannini (pd) wrote: >> I\'m trying to generate objects within a subpatch using [obj( messages, >> and I want those generated objects to have $0 as one of their >> arguments, e.g. [myobject $0]. Using [obj x y myobject $0( gives >> [myobject 0] (I know $0 is not for messages, just thought I\'d give >> that a try), and of course [list append $0] to the object message just >> adds the interpreted $0 of the parent patch. I\'d like to preserve the >> \"$0\". Anyone know of a way to do it? > >Hi, > >I think the attached patch demonstrates what you mean. That works for $0, but it wouldn\'t with $1. If you replace the \"0\" with a \"1\" in the message box, you will still get a [test $0] object in the result window. I think that \"makefilename\" just doesn\'t work with multiple parameters: any \"%s\" or \"%d\" except the first one, will evaluate to \"(null)\" or 0 respectively. Furthermore, the following will make PD crash: [list cat 2 dog( | | [makefilename foo%s_%d_%s] | | [print] Maybe it just isn\'t meant to handle lists (or messages that aren\'t just a single float or symbol). However, it is possible to \"compose a filename\" with multiple parameters using the trick described in the makefilename help patch, which would permit creating objects with $1 or $whatever. Thanks Chris for the trick, I also needed that :) Bye M. -- Email.it, the professional e-mail, gratis per te: http://www.email.it/f Sponsor: Prestiti Online. Scopri subito se sei finanziabile. in 24 ore senza spese né anticipi, clicca qui Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=2908&d=20070208

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Live Apectrum Analyzer
by Thomas Mayer 08 Feb '07

08 Feb '07

Hello, as I'm diving deeper and deeper into Pd and externals, I'm willing to do some video works. One of my aims is to create a spectrum analyzer, preferably with pdp and pidip, as I have just compiled those without any problems. Now, that I'm reading about the different objects, I don't have a clue how to accomplish that. Is there an easy online tutorial available? Or did anyone do that already and is willing to share his/her patch with a newby? My aim is to get something like http://www.bastwood.com/aphex.php but I guess, that will be in five years or so ;) cu Thomas -- "Prisons are needed only to provide the illusion that courts and police are effective. They're a kind of job insurance." (Leto II. in: Frank Herbert, God Emperor of Dune) http://thomas.dergrossebruder.org/

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[OT] gallery installation sound
by Kevin McCoy 08 Feb '07

08 Feb '07

Hello all, Apologies for the ot post; I've got my final thesis show coming up in early April and I'm doing all sound work using Pd. The gallery space I am using is actually quite poor for acoustics, as it's got a concrete floor and metal roofing. It's relatively small though - two hallways each about 10 feet by 30 feet large (3 by 9 meters if you like) making a "T" shape. I would like to do two 4 channel sound installations, perhaps one for each hallway. I know there are many sound scientists and artists on the list so I thought I would ask if anyone knows of resources to look at for dealing with these kinds of issues? How are other artists sorting these things out? Any links or recommendations would be very helpful. Low ends tend to get very muddy and the highs and mids spill all over the place. Are there certain tricks I could use in mixing or placement/kinds of speakers to preserve the highs and mids better in a difficult space? This might be a difficult question since you can't hear the piece in person, but even general advice would be very helpful. Also if any of you have documentation of your own installations, I would love to see them. Thanks! Kevin -- ++++ http://pocketkm.blogspot.com

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PD & CHAT
by juto aviten 08 Feb '07

08 Feb '07

another simple questions : I try to chat in PD and to catch result of the chat... can't find any object for this... does something exist in this idea? thanx juto

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Pd-list February 2007