Pd-list November 2010

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127 participants
197 discussions

unable to open pdp_v4l webcam video stream
by Menno van der Woude 21 Nov '10

21 Nov '10

Hello, with the purpose of being able to track elements in sight of a cam by virtue of their color, I would like to use and explore the possibilities of pdp_ctrack. While this does work with prerecorded video (avi) i am unable to try it with live video, cause pdp_v4l gives and error. See below what happens when trying to send [open /dev/video0< to [pdp_v4l]. pdp_v4l: opening /dev/video0 pdp_v4l: cap: name UVC Camera (046d:0802) type 1 channels 1 maxw 640 maxh 480 minw 48 minh 32 pdp_v4l: picture: brightness 32896 depth 0 palette 0 pdp_v4l: channel 0 name Camera 1 type 2 flags 0 pdp_v4l: switched to channel 0 pdp_v4l: cant change to norm 0 error: pdp_v4l: no method for 'type' Does anyone know if this is a matter of buying a better cam? Now using a Logitech very simple usb webcam. Or do i need to load/install a certain driver, or send other messages to [pdp_v4l]? My purpose is to get coordinates (and possibly size) of colored elements. I want to be able to track different elements simultaneously, and be able to calculate distance. Maybe a combination with size would also allow me to calculate distance in 3 dimension. Then to use the data for conditional sounds (tonal and/or atonal). Any help appreciated! Bye, Menno. -- www.indelucht.nl --- www.whatkeepsmegoing.com

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[PD-announce] Slit-Scanning Techniques With Gridflow
by Roman Haefeli 20 Nov '10

20 Nov '10

Hi all I made a group of patches of which each implements a different kind of a slit-scanning technique (though the use of the word 'slit' is a bit stretched here). Check the patches for a more detailed description of each method, here only a few examples: ROLLING SHUTTER: http://www.romanhaefeli.net/slitscanning_examples/rolling_shutter.jpg "CLASSIC" SLITSCANNING: http://www.romanhaefeli.net/slitscanning_examples/slitscan_classic.jpg T-MORPH (pixel position based time distortion): http://www.romanhaefeli.net/slitscanning_examples/t-morph.mov TX-TRANSFORM (time- and X-axis are swapped): http://www.romanhaefeli.net/slitscanning_examples/tx-transform.mov http://www.romanhaefeli.net/slitscanning_examples/tx-transform2.mov You can DOWNLOAD the patches here: http://www.romanhaefeli.net/software/pd/slitscanning_techniques.tar.gz Dependencies: Pure Data, Gridflow Have fun and let me know if you have ideas for more slit-scan-like techniques to be implemented. Cheers Roman _______________________________________________ Pd-announce mailing list Pd-announce(a)iem.at http://lists.puredata.info/listinfo/pd-announce

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Markov chains and probability
by Johnny Ferguson 20 Nov '10

20 Nov '10

Hi, I just read about Markov chains and how they can be applied to selecting pitches using probability. One thing I'm wondering is how we assure that our note selection matches the distribution of probability. Let's say our current note was C4. For the next note: P(D4) = 0.3 P(E5) = 0.2 P(F4) = 0.5 Would we simply generate a random number R (0..1) and say: if R < 0.3 then nextNote -> D4 elsif R < (0.3 + 0.2) then nextNote -> E5 else then nextNote -> F4 I only ask, because if our random number function wasn't well-distributed, we might actually see higher probabilities for certain notes than we've intended. Simply put, what is the most effective, efficient, and accurate way to select the next state based on a list of note-probability pairs connected to the current state? I'm all right with math, but probability is not one of the areas I'm very strong in. If anyone has a simple way of explaining this, I'd greatly appreciate it. I can see that markov chains could be applied to far more things than pitch (modulation, rhythm, structure, etc.), so I want to get at least a decent grasp on how we implement them reliably before I start going nuts with the idea. -Johnny

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Does anyone know how to put the monitor at fullscreen without the top menu on MAC?
by giuliano obici 20 Nov '10

20 Nov '10

I apply the GEM fullscreen but still the menu bar appears on Mac Does anyone know how to put the monitor at fullscreen without the top menu on MAC? Giuliano ________________________________ http://giulianobici.com http://n-1.art.br +55(11)7697-1212

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beginner's question - counter inside a counter?
by 2bad4you＠london.com 20 Nov '10

20 Nov '10

Hello, I have built a counter that counts from 1 to 19 and then starts again from the beginning. It reads the values from the array. However I would like it to stop after it reads the values three times. I was thinking of using another counter to do that. Any suggestions? Where should I put the other counter and how would it work? Thanks for your help.

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Re: [PD] Recording and playing back
by André Bandeira 20 Nov '10

20 Nov '10

There is an example in Kreidler's tutorial, that simulates the Alvin Lucier's piece. _______________________________________________________________________________________________________________________________________________ André Damião Bandeira (11)9819-1999 www.soundcloud.com/dami-1 www.myspace.com/basavizi From: teoria.musical(a)hotmail.com To: wallacechemical(a)gmail.com Subject: RE: [PD] Recording and playing back Date: Thu, 18 Nov 2010 14:12:20 +0000 There is an example in Kreidler's tutorial, that simulates the Alvin Lucier's piece. _______________________________________________________________________________________________________________________________________________ André Damião Bandeira (11)9819-1999 www.soundcloud.com/dami-1 www.myspace.com/basavizi > Date: Thu, 18 Nov 2010 14:05:32 +0100 > From: wallacechemical(a)gmail.com > To: pd-list(a)iem.at > Subject: [PD] Recording and playing back > > Hi, > > I want to write a little patch in order to record 30seconds of audio, > playing it back and then again recording and playing it back, and so > on. > > Any examples/objects to suggest ? > > thx > > -- > _.|| _. _ _ > \/\/(_|||(_|(_ (/_ > > _______________________________________________ > Pd-list(a)iem.at mailing list > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list

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Re: [PD] Pd + HTML on Android
by chrism 20 Nov '10

20 Nov '10

On Fri, 19 Nov 2010 21:38:36 +1100, Richie Cyngler <glitchpop(a)gmail.com> wrote: > Could it be used to make "web apps" too? I guess it depends what you mean by "web apps". I can make your Pd patches run on Android with HTML interfaces to control them. The use case I most have in mind is this: <http://mccormick.cx/news/entries/cheap-modular-fun-music-devices> Cheers, Chris. ------------------- http://mccormick.cx

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3d tube with control of the position of the extremities
by Luiz Naveda 19 Nov '10

19 Nov '10

Dear List, I was trying to build 3d cylinders using GEM. But I the actual solutions (cylinder and tube) cannot be easily manipulated. I would like to control the x y z of the extremities of the tube, like a [polygon 2] but with control of diameter and faces of the cylinder. Any useful tip? I am really missing the point or there is no easy solution for that in PD? All the best Luiz -- Luiz Naveda _____________________________________________________ - PhD researcher http://www.ipem.ugent.be/samba - Director SysMus09 http://www.ipem.ugent.be/sysmus09 IPEM - Institute for Psychoacoustics and Electronic Music Ghent University Office: + 32 9 264 4127 Blandijnberg 2 Ghent, B-9000 Belgium ^v^ ^v^ ^v^ ^~^~^~^~^~^~^~^~~^~~^~~^~^~^~~~^^~^~~~~ ^~^~^~^~^~^~^~^~^~^~~^~~^~~^~^~^~~~^~~~

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beginner's question - the audio doesn't work
by 2bad4you＠london.com 19 Nov '10

19 Nov '10

Hello, I am not a sound professional and I have only been using PD for a short while so excuse me if it's a stupid question. I am trying to create a short ringtone-like melody using PD. I created a patch that reads data from an array and then connects to dac~ but when I try to turn the toggle on no sound is coming out! How can I change so I could actually hear the sound? I have attached the patch with this message. Thanks a lot!

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[GEM] compilation error in fedora13
by Jaime Oliver 18 Nov '10

18 Nov '10

Hi all, I am getting the following error when running ./configure in the latest gem from svn: checking whether ln -s works... yes ./configure: line 3662: syntax error near unexpected token `REFERENCEPATH=$GEM_RTE_REFERENCEPATH' ./configure: line 3662: `REFERENCEPATH=$GEM_RTE_REFERENCEPATH' any idea what it means? best, J -- Jaime E Oliver LR www.jaimeoliver.pe 858 750 0924 (cel) 858 202 1522 (home)

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Pd-list November 2010