Pd-list October 2011

pd-list@lists.iem.at

120 participants
174 discussions

Simple motion analysis
by Jean-Marie Adrien 17 Oct '11

17 Oct '11

Hi list Video frame analysis : I would like to be able to make a difference between - motions of poeple passing by (displacements) - motions of poeple standing by somewhere (and slightly moving on place, presence) in a simple way ... anyone got an idea of with what pix_objects to start ? thanks jean-marie

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0.43+ gui performance problem
by Yury Bulka 17 Oct '11

17 Oct '11

Hello dear Pd users and developers, I have a basic problem: on my system (debian sid, i386) Pd 0.43+ as well as Pd-extended 0.42.5 both have very low gui performance (sometimes it takes couple of seconds to update). It's happening even if I have one object in a maximized window and try to move it with DSP off. I think this can be somehow related to the GUI rewrite (fonts? UTF-8 support?), because Pd-vanilla 0.42.x was running quite well. I've also tried to compile Pd-vanilla 0.43.1x from upstream source, but got the same result. What might be the cause? Did anyone experience something similar? Thanks for reading, YurB

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Arduino UNO how-to in puredata.info
by Pierre Massat 17 Oct '11

17 Oct '11

Hi all, I've created a page in the Documentation folder to help arduino UNO owner fix their board if they need to use it in Linux (assuming that Pd users who need an interface to control Pd also need low-latency, and most probably use a linux machine). It's here : http://puredata.info/docs/GettingArduinoUNOToWorkInLinux/ Mr. Steiner helped me with the formatting! I think it lacks a link to Pduino, at least. Please let me know if you think that this really doesn't fit in the website. I believe it does. Cheers! Pierre

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pd with syphon
by Pagano, Patrick 17 Oct '11

17 Oct '11

Has anyone got pure data extended working with Syphon? http://syphon.v002.info/ pp

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Hold integer until bang object??
by Sebastian Valenzuela 17 Oct '11

17 Oct '11

Hello, Is there an object that will hold a number it has received and wait for an incoming "bang" to go ahead and SEND that number through its output? Or is there a way to make this work? I would need this to work more than once. For example: *send 41 to object*, *send bang which releases 41 from its output*, *send 57 to object*, *bang which releases 57*, etc... Thank you for taking the time to read this! Any help is greatly appreciated! -Sebastian

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Re: [PD] pd with syphon WORKS!
by news＠petervenus.de 15 Oct '11

15 Oct '11

Hello now, the only thing i would need would be a syphon client for pd, that we could get other applications output into pd.... someone already working on this? best, peter -----Ursprüngliche Nachricht----- Von: vade <doktorp(a)mac.com> Gesendet: 14.10.2011 19:01:30 An: Betreff: Re: [PD] pd with syphon WORKS! Unfortunately, those solutions read back to main memory, which is slow, and adds a lot of latency and processor overhead. Syphon works directly on the GPU, sharing the OpenGL resources directly, app to app, no readback or round tripping. This allows sharing to any resolution your GPU supports (assuming you have the fill rate and VRam). I've personally been able to do 2K ARGB frames at around 30fps, from one app to another. This will depend greatly on your GPU and system load however. On Oct 14, 2011, at 10:40 AM, Max wrote: > > Am 14.10.2011 um 11:35 schrieb Py Fave: > >> hi list >> >> 1. what would be the equivalent in linux let's say ubuntu ? it's a frame server implementation? >> any way to redirect gem output ? > > gstreamer > http://puredata.info/community/projects/convention09/zmolnig.pdf/view > > already works since 2009 afaik. > > m. > _______________________________________________ > Pd-list(a)iem.at mailing list > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list _______________________________________________ Pd-list(a)iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list

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Keyboard shortcuts for "nudge", "done editing"
by Marvin Humphrey 15 Oct '11

15 Oct '11

Greetings, A couple questions from a PD noob: First, is there any keyboard shortcut to signal "I'm done editing text"? When entering text into an object, a message, etc, it seems that the only way to signal that you are finished is a mouse click outside of the item being edited. I'd like to press a key -- <ESC>, <TAB>, <ENTER>, whatever -- and have the focus leave the text box. Second, is there any keyboard shortcut to "nudge" an element? It would be great to select an object (or a group of objects), then press <LEFT_ARROW> to move it one pixel, or <CONTROL/COMMAND><LEFT_ARROW> to move it 10 pixels (or N pixels). If such things are not possible, I'm curious what other mechanisms people have come up with to streamline the editing process, because it feels like I'm having to touch the mouse waaaaaaay too often and it's slowing me down. It seems I'm not the only person to have made such observations: http://artengine.ca/~catalogue-pd/18-Lee-Bouchard.pdf One obvious shortcoming is that users are required to constantly switch between keyboard and mouse to operate the program. This becomes especially problematic in the context where patches are developed rapidly. I'm using PD Vanilla, built from the latest sources. I'm an experienced open source developer, fluent in C and learning Tcl, so suggestings that involve hacking the source are welcome. Cheers, Marvin Humphrey

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Re: [PD] very compressed chip sounds (fwd)
by Mathieu Bouchard 15 Oct '11

15 Oct '11

Le 2011-10-13 à 21:52:00, John Dunlap a écrit : > Amazing efficiency! I'd really like to know how you put that together - > it seems like an interesting approach to PD. > >> From: Mathieu Bouchard <matju(a)artengine.ca> >> A simple synth playing notes of the scale... in two boxes (dac~ included). It's my first use ever of [fexpr~]. However, I already knew quite a bit of theory about things like this. You can get some of it in the pd help files, or more in detail in Miller's book, and in even more detail in pd's source code. Each line (each semicolon-separated part) represents one outlet, and one element of the $y series : $y1,$y2,$y3,... Note that $y is a shortcut for $y1. $y1 is a phasor with frequency 0.00012*44100. $y2 is a click generator by looking at sudden drops in $y1. $y3 does a cycle of fifths (quintes) over two octaves. A fifth is 7 semitones. Two octaves is 24 semitones. $y4 is a shortcut for adding 7*12 to the note number, doing [mtof~], and converting that frequency from Hz to radians, where 44100 Hz = a full turn = 2π radians. 2π=6.283186... $y5 and $y6 combine this angle with a radius of 0.9999 and converts this from polar to cartesian, which needs a cos, a sin, and two *, and then computes a [cpole~] whose 2nd inlet is not connected, and whose first inlet is $y2 multiplied by 8. This causes [cpole~] to act as an oscillator, as it makes a point spin around the centre by doing many small rotations. $y5 and $y6 are two sinusoïdal waves whose phase difference is 90⁰, because one is the horizontal position of the spinning point, and the other is the vertical position. $y7 and $y8 just use sin as a waveshaper (nonlinear), which creates a bunch of harmonics to make the sound richer. The role of the 0.9999 radius factor is to make the wave decay with a factor of 0.9999 per sample, which is a loss of 0.01 % per sample. If you compute this : log(½)/log(0.9999)/44.1 kHz = about 157.168 ms This tells you that the amplitude drops by half every 157 ms. That's how we control note duration. You can verify this by doing : pow(0.9999, 157.168 ms * 44.1 kHz) = about ½ But the waveshaper complicates the decay a lot. ______________________________________________________________________ | Mathieu BOUCHARD ----- téléphone : +1.514.383.3801 ----- Montréal, QC

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pdmtl users group
by Mathieu Bouchard 14 Oct '11

14 Oct '11

(replying to irc conversation between Maxime and Hans) <_hc> maxster: how was the patching circle? <maxster> _hc: when? <maxster> pdmtl is sunday <_hc> oh, I thought there was just one that happned That's because maxster posted about the change of location of pdmtl, which was supposed to happen at the FouLab hackerspace, but maxster had made a mistake with the schedule and decided to relocate the upcoming meeting to Concordia university. You assumed that he was talking about a current event. That was some minutes before I posted on pd-announce saying « 16 octobre », because I was waiting for maxster's cue. <maxster> not that much of a patching circle, more of a show and tell There is always an aspect of giving patching tips to each other, but the fact is that the show-and-tell aspect of it is really driving the group. Part of it is because I expect it to be that way, and part of it is because people expect me to take the lead. I figure that if there were really a need for patching together in those meeting, someone would make a serious proposition and it would become a big item on the schedule. I have often said that people can propose other things than presentations (performances, tutorials, roundtables, patching, etc.) but I often say just « presentations » because of the habit of rarely ever having other things on the schedule. No matter what's in the schedule, chit-chat usually fills until the meeting becomes longer than the planned 240-minute span. I might call it chit-chat but it's usually on-topic. Btw I just updated the collection of all announcements to include all past meetings (now there are 43 instead of 30). It doesn't include all the errata and addenda though. The list of links is in the middle of this page : http://wiki.dataflow.ws/PdMtl ______________________________________________________________________ | Mathieu BOUCHARD ----- téléphone : +1.514.383.3801 ----- Montréal, QC

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Re: [PD] My library and stuff (filters, oscillators, etc.)
by Patrice Colet 14 Oct '11

14 Oct '11

Hello, thank you for sharing thoses patches! balance.mmb~ is quite usefull, in it's help file I'd like to know why there is an amplitude modulation when changing cut-off frequency is this coming from level adjusting from balance.mmb~ or something else? In other help patches there are several objects missing, I guess they have been done with pd-extended, but not all libraries are enabled by default in pdx, so it's not easy to find out which one to use for having all your patches working. Why file browser likely won't work on windows? where count~ come from? why not make all your patches vanilla compatible? in biquad.mmb~-help.pd it uses filtercoef.mmb~ instead of filtercoef.mmb, so there are errors in console because a bang is coming into inlet~ I've uploaded the zip from git repo. ----- "Mike Moser-Booth" <mmoserbooth(a)gmail.com> a écrit : > Hello list, > > I just put my personal library of abstractions on GitHub today, and > I'd thought I'd share it here as it's seems to have gotten a positive > reaction on the forum. It includes some things that I think are > useful, such as band-limited oscillators, various filters (including > audio-signal controlled, check out the help for [filtercoeff.mmb~] > for > a good place to start), complex math operators, a few effects, > state-saving stuff, a cute waveform display, and other stuff. > > Anyway, check it out here: > > https://github.com/dotmmb/mmb > > .mmb > > -- > Mike Moser-Booth > mmoserbooth(a)gmail.com > > _______________________________________________ > Pd-list(a)iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list -- Patrice Colet

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Pd-list October 2011