Pd-list October 2010

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124 participants
181 discussions

GEM performance problem on ubuntu 64 bit and/or mac hardware?
by Matteo Sisti Sette 03 Oct '10

03 Oct '10

Hi, Is there any known serious performance issue with GEM on Ubuntu 64bit? Or is there some known problem with this OS on intel macs? A friend of mine has just installed Ubuntu 10.04 amd64 on her Macbook pro which has an intel core duo 2.4GHz processor. She has tried a patch which plays 4 videos at the same time and she experience much worse performance than I do with the same patch and same videos on my intel core duo 2.1 GHz pc. The only differences appear to be the hardware and the fact she is using 64bit ubuntu while mine is 32bit..... I'm not sure if the macbook may have a slower hard disk or a less powerful gpu, but the difference in performance is about a factor 2, it's huge..... I know this is very little information but does this remember you of some known issue? thanks m.

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help rendering videos on a Windows machine, problems with encoder ? pix_film gems.movies
by Fernando Krum 02 Oct '10

02 Oct '10

Hi there, sorry if i'm repeating same questions here, but i couldn't find it anywhere searching the list.. i'm trying to playback videos on a Windows Vista machine. when i first place a pix_film object on Pd the console confirms directshow and quicktime support. i am using gems.movies from pdmtl abstractions, i have used it really well on a ubuntu machine, but on windows it wont play normally. i am using photo-jpeg encoding for the videos and a 44.1khz wav audio file with same filename for playback. when i try to go fullscreen it decreases performance a lot and drop frames on the go. anybody has ever went through a problem like this ? would you tell me which encoder should i use for optimal playback for my files ?? thank you very much for your help... cheers. ferkrum.

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tried but cannot sync A/D/A if I try to set delay>50
by Matteo Sisti Sette 02 Oct '10

02 Oct '10

Hi, If I go to media/audio setting and try to set a delay higher than 50ms, I get a lot of "tried but couldn't sync A/D/A" messages and then "audio I/O stuck... closing". This is on Ubuntu 10.04 with Pd Extended 0.42.5, with ALSA. In windows I used to increase the delay when I had cpu-heavy patches (or when some other cpu-heavy application had to run on the same computer) in order to have a bigger buffer and less dropouts and it used to work seamlessly. I got more latency, obviously, but it worked better (less dropouts), not worse. Why do I get these errors, what do they mean and why should a higher delay value trigger them??? thanks m.

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[PD-announce] Ottawa's Mini-Maker Faire
by Mathieu Bouchard 02 Oct '10

02 Oct '10

http://artengine.ca/news/2010/makerfaire-en.php ------------------8<--------cut-here--------8<------------------ Ottawa's Mini-Maker Faire 12 – 6PM November 6th and 7th, 2010 2 Daly Ave. Free "Considering that some of the greatest leaps forward in American technological history have been scrappy homebrews (Apple Computer was a literal garage startup), it's really kind of exciting to think that, given its explosive growth, the Maker Faire might well help along an invention or two that's truly important." – Advertising Age The innovation laced through the capital region is impressive, and this first ever Mini-Maker Faire is a chance to connect creative people from all over our region in a celebration of the DIY spirit. A Mini-Maker Faire brings together families and individuals who celebrate Arts, Crafts, Engineering, Food, Music, Sustainability, and Science and those who embrace the Do-It-Yourself (DIY) spirit. At Maker Faire, the focus is on the process of making – not just the finished product. The real story here is the curiosity, vibrancy, and passion of the Makers themselves, the people who comprise the rapidly emerging DIY category. Scientists, homemakers, students, automotive enthusiasts, software developers, musicians, crafters of all stripes: individuals and communities of people drawn together by a common delight in the magic of tinkering, hacking, creating, and reusing materials and technologies. _______________________________________________________________________ | Mathieu Bouchard ------------------------------ Villeray, Montréal, QC _______________________________________________ Pd-announce mailing list Pd-announce(a)iem.at http://lists.puredata.info/listinfo/pd-announce

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Re: [PD] How to make a buzz? (I'm no king bee)
by Pierre Massat 02 Oct '10

02 Oct '10

It doesn't seem to output a steady pulse either (see attached patch - then again i hope i got you). Maybe it doesn't really matter. I can try with my guitar right now. Out of curiosity, what kind of resonator can i use? I only know resonant filters (like the moog~ bp filter) and karplus-strong resonators. Thanks again for your help. (I think i've been forgetting to reply to the list...) 2010/9/30 Pierre Massat <pimassat(a)gmail.com> > So basically, i get a square wave. Then i use the rzero filter with a > parameter set to 1, so that i get X(n)-X(n-1), which is equal to 0 all over > the flat sections of the wave (except for the first sample), and equal to > Delta (or something) or -Delta at the points where is rises and falls. If i > clip this again between 0 and 1, i get a pulse everytime the wave rises from > -1 to 1. Am i wrong? I have never used such a filter... > Thank you! > > Pierre > > 2010/9/30 Andy Farnell <padawan12(a)obiwannabe.co.uk> > > >> >> >> Yeah its a bitch actually because in Pd >> the blocksize sets an effective resolution >> for events. You could ask on-list about >> tricks with blocksize, Frank might have >> a solution. >> >> >> I'll share a couple of DSP tricks wit you >> as used in guitar subharmonic processors, >> if you don't mind keeping it all in the audio >> domain (which can be more tricky) >> >> Firstly you amplify by about 100 and clip >> the signal >> >> [*~ 100] >> | >> [clip~ -1 1] >> >> this gives you basically a square wave >> >> Next differentiate using a [rzero~] >> so that you get a series of pulses. >> >> Rectify them by clipping again [clip~ 0 1] >> >> Use these pulses to drive into a bank of >> parallel resonators for the rattle effect. >> >> cheers, >> >> Andy >> >> >> >> >> >> >> >> >> >> >> On Thu, 30 Sep 2010 20:15:15 +0200 >> Pierre Massat <pimassat(a)gmail.com> wrote: >> >> > Ok, i think i get it. >> > I've tried do make a simple zero-crossing detection patch using >> threshold~, >> > but it doesn't seem to really work. From what i've read here and there >> about >> > zero crossing in Pd it seems like the size of audio blocks is an issue >> here. >> > Using a simple osc~ as a sound generator and a threshold~ set to 0 0 0 >> 0, i >> > get a fairly steady bang at very low frequencies, but it gets extremely >> > messy for frequencies above 10 Hz or so. >> > I ve tried reducing the block size in the subpatch where threshold~ is, >> to >> > no avail. >> > I haven't found anything that properly deals with zero crossing >> detection in >> > Pd. So i'm kinda stuck! >> > >> > Pierre >> > >> > 2010/9/29 Andy Farnell <padawan12(a)obiwannabe.co.uk> >> > >> > > On Wed, 29 Sep 2010 08:42:28 +0200 >> > > Pierre Massat <pimassat(a)gmail.com> wrote: >> > > >> > > > Hi Andy, >> > > > Are you talking about something like that: >> > > > http://www.complexity.org.au/ci/vol01/fletch01/html/ >> > > >> > > Not quite. THis is very interesting (I've bookmarked it >> > > for future reading) but deals with non-linearity >> > > in a continuous equation. >> > > >> > > For rattling, we are interested in dis-continuous >> > > coupling. >> > > >> > > >> > > > I m not familiar with zero crossing detection at all. From what i ve >> read >> > > in >> > > > the archives it seems to be possible to do it with edge~. >> > > >> > > If you search you will find other ways using snapshot~ and threshold~ >> > > too. >> > > >> > > > So i'd need to >> > > > trigger something like a pulsed noise everytime it detects a zero? >> That'd >> > > be >> > > > the trick? >> > > >> > > Yes, basically drive another synth that makes a pulse or resonant >> click >> > > every time the string crosses zero. >> > > >> > > > Thanks again for your help! >> > > > >> > > > Pierre >> > > > >> > > > 2010/9/28 Andy Farnell <padawan12(a)obiwannabe.co.uk> >> > > > >> > > > > >> > > > > >> > > > > Aha! This is a different problem. It's about creating >> > > > > a discontinuity such that the string excursion seems to >> > > > > cause a point of new impact in a different system. >> > > > > >> > > > > >> > > > > The traditional way is to do zero crossing detection >> > > > > and use that to trigger some other sound. >> > > > > >> > > > > best, >> > > > > Andy >> > > > > >> > > > > On Tue, 28 Sep 2010 13:07:49 +0200 >> > > > > Pierre Massat <pimassat(a)gmail.com> wrote: >> > > > > >> > > > > > So i'm really only interested in modeling the rattling sound, >> the >> > > buzz, >> > > > > to >> > > > > > get a dirtier sound, like in most african instruments. I don't >> know >> > > if >> > > > > > you've ever played a guitar with a strip a paper kind of weaved >> > > accross >> > > > > the >> > > > > >> > > > > -- >> > > > > Andy Farnell <padawan12(a)obiwannabe.co.uk> >> > > > > >> > > >> > > >> > > -- >> > > Andy Farnell <padawan12(a)obiwannabe.co.uk> >> > > >> >> >> -- >> Andy Farnell <padawan12(a)obiwannabe.co.uk> >> > >

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question about multithreaded externals in Pd
by Ivica Ico Bukvic 02 Oct '10

02 Oct '10

Hi all, I am wondering if anyone can shed some light on the following predicament. I am by no means a multi-threading guru so any insight would be most appreciated. The following are relevant excerpts from the code of an external. AFAIK the external initializes mutex and cond and spawns a secondary worker thread that deals with audio-unfriendly (xrun-causing) write operations to the wiimote and terminates it when the object is destructed waiting for the thread to join back and then destroying the mutex. Now, if I add a bit of usleep right after the thread has been spawned as part of the constructor (as included below) the external seems very stable (e.g. cutting and pasting it as fast as keyboard allows, or in other words constructing and destructing instances of it as fast as possible does not result in a crash). Yet, when one does not use usleep right after spawning the secondary (worker) thread in the constructor, the whole thing is very crash-prone, almost as if the spawning of thread does not go well unless given adequate time to do get things all into sync, so to say, even though this makes to me no sense as the way I understand it the constructor does not move ahead until pthread_create does not return a value (which in this case I am not bothering to read). Curiously, when not using usleep, a crash may occur right at creation time, at any point while the object exists, and even as late as during its destruction. Any ideas? P.S. I am also including the entire file for those interested in trying it out. Best wishes, Ico Relevant excerpts (in random order and incomplete to allow for greater legibility): //struct defining the object typedef struct _wiimote { t_object x_obj; // standard pd object (must be first in struct) ... //Creating separate threads for actions known to cause sample drop-outs pthread_t unsafe_t; pthread_mutex_t unsafe_mutex; pthread_cond_t unsafe_cond; t_float unsafe; ... t_float led; ... } t_wiimote; //constructor static void *pd_cwiid_new(t_symbol* s, int argc, t_atom *argv) { ... x->led = 0; // spawn threads for actions known to cause sample drop-outs threadedFunctionParams rPars; rPars.wiimote = x; pthread_mutex_init(&x->unsafe_mutex, NULL); pthread_cond_init(&x->unsafe_cond, NULL); pthread_create( &x->unsafe_t, NULL, (void *) &pd_cwiid_pthreadForAudioUnfriendlyOperations, (void *) &rPars); //WHY IS THIS NECESSARY? I thought that pthread_create call will first finish spawning thread before proceeding usleep(100); //allow thread to sync (is there a better way to do this?) ... } //destructor static void pd_cwiid_free(t_wiimote* x) { if (x->connected) { pd_cwiid_doDisconnect(x); //this one has nothing to do with thread but rather disconnects the wiimote } x->unsafe = -1; //to allow secondary thread to exit the while loop pthread_mutex_lock(&x->unsafe_mutex); pthread_cond_signal(&x->unsafe_cond); pthread_mutex_unlock(&x->unsafe_mutex); pthread_join(x->unsafe_t, NULL); pthread_mutex_destroy(&x->unsafe_mutex); ... } //worker thread void pd_cwiid_pthreadForAudioUnfriendlyOperations(void *ptr) { threadedFunctionParams *rPars = (threadedFunctionParams*)ptr; t_wiimote *x = rPars->wiimote; t_float local_led = 0; t_float local_rumble = 0; unsigned char local_rpt_mode = x->rpt_mode; while(x->unsafe > -1) { pthread_mutex_lock(&x->unsafe_mutex); if ((local_led == x->led) && (local_rumble == x->rumble) && (local_rpt_mode == x->rpt_mode)) { pthread_cond_wait(&x->unsafe_cond, &x->unsafe_mutex); } if (local_led != x->led) { local_led = x->led; //do something } } if (local_rumble != x->rumble) { local_rumble = x->rumble; //do something else } ... pthread_mutex_unlock(&x->unsafe_mutex); } pthread_exit(0); } //an example of how the thread is affected by the main thread void pd_cwiid_setLED(t_wiimote *x, t_floatarg f) { if (x->connected) { x->led = f; pthread_mutex_lock(&x->unsafe_mutex); pthread_cond_signal(&x->unsafe_cond); pthread_mutex_unlock(&x->unsafe_mutex); } }

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[ANN] Linux Audio Conference 2011
by Robin Gareus 01 Oct '10

01 Oct '10

sorry for x-posting. Dear Linux Audio developer, user, composer, musician, philosopher and anyone else interested, you are invited to the... Linux Audio Conference 2011 The Open Source Music and Audio Software Conference May 6-8 2011 Music Department, National University of Ireland, Maynooth Maynooth, Co.Kildare, Ireland http://music.nuim.ie As in previous years, we will have a full programme of talks, workshops and music. Two calls will be issued, a Call for Papers (see below) and Call for Music (soon to be announced). Further information will be found in the LAC2011 website (under construction). ================ CALL FOR PAPERS ================= Papers on the following categories (but not limited to them) are now invited for submission: * Ambisonics * Education * Live performance * Audio Hardware Support * Signal Processing * Music Composition * Audio Languages * Sound Synthesis * Audio Plugins * MIDI * Music Production * Linux Kernel * Physical Computing * Interface Design * Linux Distributions * Networked Audio * Video * Games * Media Art * Licensing We very much welcome practical papers resp. software demos ("how I use Linux Audio applications to create my music/media art"). Paper length: 4-8 pages, with abstract (50-100 words) and up to 5 keywords. Language: English. The copyright of the paper remains with the author, but we reserve the right to create printed proceedings from all submitted (and accepted) papers. IMPORTANT DATES: Submission deadline: 15/January 2011 Notification of acceptance: 7/March 2011 Camera-ready papers: 1/April 2011 Queries: Victor Lazzarini, NUI Maynnooth (victor.lazzarini(a)nuim.ie)

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pd extended randomly crashes when I save
by Matteo Sisti Sette 01 Oct '10

01 Oct '10

Hi, Often when I hit ctrl+s to save a patch, my Pd extended crashes; it closes itself without any message at all. Is there some place I can look at to find some log file or something that I can post, in order to provide further information? It's Pd version 0.42.5-extended-20100601 for Ubuntu By the way it crashes BEFORE it saves, so it's extremely critical thanks m.

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more dimensions for boids ?
by ronni montoya 01 Oct '10

01 Oct '10

Hello everybody , i was reading a paper that describe the software swarm music(Blackwell and Bentley 2002). This software uses 7 dimensional boids instead of 2 or 3 . I was wondering how can i implement this in pd? Is it possible to add more dimensions to the boids2d or boids3d external? how can i do that? how can i implement boids with more dimensions? If its not possible wouldnt be any difference if i use 2 boids3d objects to control 6 audio parameters? would it be the same having 2 boids3d objects controlling 6 parameters and having one boid of 6 six dimentions? thanks in advance. R.

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Re: [PD] pdpcap 0.0.4 network sniffer new version
by Jordi Sala 01 Oct '10

01 Oct '10

I was going to change the name to pdpcap, but it would be very confused to have the same name that the pcaplib, that use pcap.. so, the name could be pktcap? I will expect until next week if there is any suggestion ... On 30 September 2010 22:16, ALAN BROOKER <alan.brooker2010(a)gmail.com> wrote: > really like this patch :) > pcap is a pretty good name! > > On Thu, Sep 30, 2010 at 3:02 PM, Jordi Sala <poperbu(a)gmail.com> wrote: > >> Yes it can be renamed, I named pdpcap when I started the object >> (PD+PCAPlib)...,... pcap could be a good name....any suggestions? >> >> On 30 September 2010 13:45, Mathieu Bouchard <matju(a)artengine.ca> wrote: >> >>> On Wed, 29 Sep 2010, Jordi Sala wrote: >>> >>> PDPCAP 0.0.4 new features >>>> >>> >>> Could it be renamed so that it doesn't look like it's something to do >>> with PDP ? (or is it PDP's fault for using non-distinctive naming ?) >>> >>> _______________________________________________________________________ >>> | Mathieu Bouchard ------------------------------ Villeray, Montréal, QC >> >> >> >> >> -- >> Jordi Sala >> http://musa.poperbu.net >> >> _______________________________________________ >> Pd-list(a)iem.at mailing list >> UNSUBSCRIBE and account-management -> >> http://lists.puredata.info/listinfo/pd-list >> >> > -- Jordi Sala http://musa.poperbu.net

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Pd-list October 2010