Pd-list March 2012

pd-list@lists.iem.at

130 participants
180 discussions

Keystone correction
by Charles Goyard 07 Apr '12

07 Apr '12

Hi list, this is very basic, in fact so basic no one ever asked it seems :) I need to correct the trapezoidal/keystone deformation of a video. The beamer I use can't correct enough, so I need to do that with GEM. I heard of a keystone library but could not find it. I tried various rotate/scale/translate without getting good enough results. So I thought I could have a polygon with a texture mapped on it, and the stretch the corners. The problem I have is that my patch is as follows: [pix_image test.png] | [pix_texture] | [circle 4] (The circle is used to make a mask so the video boundaries are round.) Adding a polygon after the circle does not seem to work. Any advice welcome. -- Charlot

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rtc lib help patch revisions
by Jonathan Wilkes 01 Apr '12

01 Apr '12

Hi, Who is in charge of the rtc library? I've got revised help patches with the pd-meta subpatches in them. -Jonathan

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Recording a stream of data
by Ricardo Dueñas Parada 31 Mar '12

31 Mar '12

Hi, I am working on a project on distance with some friends, and I want to work with some data, but the data is coming from them (on another country). I don´t have the device with me so I want a way for them to record/log the stream of data (7 simultaneous channels ) in an plain text file so I can play it here and work over it. I used once something like that, I remember it streamed the data (from the text file) over OSC (keeping the right time of messages), so I could read it with mrpeach's OSC objects. Can you give me any clue on how to achieve that? Thank you. *RICARDO DUEÑAS PARADA ** *

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Re: [PD] WebPd - Re: Webkit and firefox support
by Vilson Vieira 30 Mar '12

30 Mar '12

Sebastien, incredible! Looking forward to see you dynamic patching thing! Wishing to help soon. Keep rocking! 2012/3/30 sebastien piquemal <sebpiq(a)gmail.com> > Thanks ! I was kind of afraid that you were upset by me raping your code > ... > > I think what I did really made the whole thing easier to maintain and > easier to test. The new architecture is as uncoupled as possible and so > allows for more hardcore testing (for example, I wrote full unit-tests for > [cos~] : https://github.com/sebpiq/**WebPd/blob/master/test/** > objects.js#L60<https://github.com/sebpiq/WebPd/blob/master/test/objects.js#L60> > ). > I'll continue refactoring in the same direction, and I expect that in ~ 1 > month, I'll arrive to a point where it will be about stable. > Also, I finished yesterday to implement an API for complete dynamic > patching. For example, you can now do : > > var patch = new Pd.Patch(); > var osc440 = new Pd.objects['osc~'](patch, [440]); > var dac = new Pd.objects['dac~'](patch); > patch.connect(osc440.getId(), 0, dac.getId(), 0); > patch.connect(osc440.getId(), 0, dac.getId(), 1); > > There's still a bunch of stuff I'm not fully satisfied of, but overall > that's the idea. > Also, I am moving slowly all the objects from the old system to new system > (implementing full unit-testing at the same time), so many objects are not > available yet, because not yet migrated. > > Cheers, > > Sébastien > -- Vilson Vieira vilson(a)void.cc ((( http://automata.cc ))) ((( http://musa.cc ))) ((( http://labmacambira.sourceforge.net )))

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issue with RGB colors in GUI (toggle,bang,...)
by Angakok Thoth 30 Mar '12

30 Mar '12

Hi, I'm having troubles with setting some shades of colors to toggleboxes (probably even other objects) For example, this shade of red: Red=192. Green=0, Blue=0 - (192*65536) - (0 * 256) - (0) = -12582912 If I make a messagebox |color -12582912[ and send it to the togglebox, i get bright blue. what am I doing wrong? for most shades of colours it seems to be working OK, but not for this one and not for some others. I don't know, but also the fact, the PD rewrites my messagebox to |color -1.25829e+007[ after save, seems suspicious to me. Is PD rounding the numbers in messageboxes? (the new form seems to be missing few digits) please help if you can thanks & regards, ::.:

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WebPd - Re: Webkit and firefox support
by Chris McCormick 30 Mar '12

30 Mar '12

Hi Sébastien, On 03/20/2012 03:18 PM, s p wrote: > Did you have time to take a look at the work done ? Seems like I am not going to have time to keep up with your pace of development. I have put a note on my WebPd project page <http://mccormick.cx/projects/WebPd/> that the latest development is happening at your GitHub fork: https://github.com/sebpiq/WebPd Anybody interested in the new stuff being added to WebPd should look there. Really great to see this moving forward so quickly. :) Cheers, Chris. -- http://mccormick.cx/

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Synchronising pix_video with direct-from-disk audio
by Iain Mott 29 Mar '12

29 Mar '12

Hi list, On linux, I am currently synchronising pix_video to audio loaded into memory. This is done by using values from vline~ to read the audio with tabread4~ and to control the playback of pix_film. It works, however I realise that I have too much multi-channel audio to load into memory and I can't see any way of synchronising audio and video if the patch was to read audio direct-from-disk with readsf~ for example. Is there a way of reading audio direct-from-disk and synchronising with pix_film? My patches also need to perform live-capture of video - and mix this with the pre-recorded video. I'm presently using pix_video for this. I'd like to find a solution within the GEM environment if possible. Thanks! Iain

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laptop advice
by João Pais 29 Mar '12

29 Mar '12

Hi, I'm considering to "upgrade" my old thinkpad R51, with something lighter and with more power. Since I need a laptop with a pcmcia slot for my multiface, no new models can be bought. I was thinking of a Thinkpad X61, as it's quite light and comes with a dual-core processor. But since I'm biased to thinkpads and don't know much more, does anyone has another suggestion? The uses of the laptop would be for Pd, work with sound files in general. The systems to be installed would be Windows7 and Ubuntu. Best, JoÃ£o

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Filter design for iPhone
by Ed Kelly 29 Mar '12

29 Mar '12

Hi, I'm trying to design or find a resonant lowpass filter for use with libPd for Openframeworks running on an iPhone 4. 1. I've tried the rjlib filter attached (filtertest_list.tar.gz) and it works fine in Pd, but instantly breaks when I run it on the iPhone - all other playing audio cuts out, and it is impossible to reset. I suspect that the buffers fb1 fb2 ff1 ff2 ff3 are hitting NAN values and staying there, but I haven't tested this. 2. I've had a go at implementing the filter from http://www.musicdsp.org/archive.php?classid=3#25 as a Pd external (mvcf~.tar.gz) and it is very efficient CPU-wise. However, higher values of f or q cause the internal filter buffers to hit NAN and stay there (tested in Pd - I haven't tried this on the iPhone yet). I would ideally like to find out why the second attempt breaks at high q and/or f, as what I want is a 24dB/Octave moog-ish filter. I'm sure those of you with higher math skills will intuitively know why, but I'm just learning calculus now (my early education was a bit chaotic). I'm also limited by the fact that this is for a commercial project (although I'll be happy to share the code :) so I can't just take a GPL external and recompiled libpd with it. Ed Gemnotes-0.1alpha: Live music notation for Pure Data http://sharktracks.co.uk/

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[PD-announce] Hypo Chrysos, action art for vexed body and biophysical media
by Marco Donnarumma 29 Mar '12

29 Mar '12

Hello folks, I finally managed to put on-line the video of the second, new performance work based on the Xth Sense. This work tries to investigate a very different field of interaction, if compared to my previous piece Music for Flesh II. Octophonic visceral sound, sensing video and 2 concrete blocks of 15kg each. http://marcodonnarumma.com/works/hypo-chrysos/ Feedback, critics and suggestions are more than welcome! and thanks Cyrille for the awesome pmpd workshop at the PdCon 2011 and shader tips! thanks, best wishes, -- Marco Donnarumma New Media + Sonic Arts Practitioner, Performer, Teacher, Director. ACE, Sound Design MSc by Research (ongoing) The University of Edinburgh, UK ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Portfolio: http://marcodonnarumma.com Research: http://res.marcodonnarumma.com | http://www.thesaddj.com | http://www.flxer.net Director: http://www.liveperformersmeeting.net _______________________________________________ Pd-announce mailing list Pd-announce(a)iem.at http://lists.puredata.info/listinfo/pd-announce

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Pd-list March 2012