Pd-list July 2004

pd-list@lists.iem.at

129 participants
204 discussions

image flashing
by amalia.dg＠tiscali.it 29 Jul '04

29 Jul '04

Dear all, I have some problems with my video tracking patch: the image that I can capture with my webcam have some periodic flash that maybe are depending from the frame rate. When the image flash there are obviously some problems with the data collected by the tracking patch. Do you know what can I do in order to solve this problem? thanks in advance, amalia

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puredata.org
by Eric Skogen 29 Jul '04

29 Jul '04

Hi Kids, I noticed puredata.org has been registered, evidently by someone at IEM? Could we get puredata.org switched over to point to the plone site? I think it's a catchy domain name. The kind you put on t-shirts and sweater vests and pocket protectors. e

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Re: Buffer Type Question
by Stefan Turner 29 Jul '04

29 Jul '04

And what if you misunderstood? :) I apologise for not explaining it very well first time. In an unfrozen delay line (always, currently) the most recent point (delay=0) is always 'now'. If you could 'freeze' that delay line at a certain point in time, call it t, then from then on the delay line will _always_ have that point t as the most recent (delay=0). Data between t and 'now' would not be stored in the line. The data stored in the line would not be changed until 'unfrozen', when it would go back to normal operation. You are talking about freezing the reading, and as you say this is quite easy. I am talking about freezing the _writing_. As for why you would want to do this, one example I would like to use it for is granular sampling. At the moment you need to kludge it with a buffer: freezable delay lines would be much nicer, I think. Sorry for the long reply, I hope this makes more sense. Stefan Message: 9 Date: Sat, 24 Jul 2004 18:31:36 +0200 From: IOhannes m zmoelnig <zmoelnig(a)iem.at> To: Stefan Turner <stefan_turner(a)yahoo.co.uk> CC: pd-list(a)iem.at Subject: Re: [PD] Buffer Type Question Stefan Turner wrote: > Hi > I think what Chris meant (correct me if wrong) was > freezing a delay line so that the read and write > pointers stay as they are and nothing new is written: > then for example a vd~ on a frozen delay line with > delay going from 1sec to 0sec over 1sec would have the > same effect as delread~ on unfrozen delay line with > delay of 1sec. This can sort of be done using a normal > buffer instead, but it would be nice to just be able > to send a 'freeze' (or whatever) message to a > delwrite~ instead. if i read the question correctly then: how do you create your delay going from 1s to 0s in 1000ms ? most probably you will use [line~] to control [vd~] and what if you could send a [stop( message to [line~] to freeze the delay-amount ? and what if this has been implemented into [line~] since i know it (which is probably *very* long) mfg.a.sdr IOhannes ___________________________________________________________ALL-NEW Yahoo! Messenger - all new features - even more fun! http://uk.messenger.yahoo.com

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lost messages (toxy vs. pd ???)
by Tim Blechmann 29 Jul '04

29 Jul '04

hi all, today i experienced one of the weirdes things i ever did when working with pd ... i've got the following setup: |inlet| | |value xyz| | both the inlet and the value are connected to a print object. when i send a bang message (from a gui object), it prints only print: bang on the console... when i'm using a normal bang, it prints both the bang and the value ... i don't want to blame toxy (i'm using tow to read a popup menu, but i'm not sure, what could cause such a behaviour at all... if it might be helpful to track this down, i could send my patch ... cheers... tim -- +++ GMX DSL-Tarife 3 Monate gratis* +++ Nur bis 25.7.2004 +++ Bis 24.000 MB oder 300 Freistunden inkl. http://www.gmx.net/de/go/dsl

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py/pyext
by Andrea Valle 29 Jul '04

29 Jul '04

Hi to all, I was trying to install py/pyext by Thomas Grill but I didn't succeed. I have osx10.2.8, Exactly, what have I to do? I use MacPython, but Thomas (who invited me posting to the list) suspected it is not the right choice. Also, what developer toolkit have I to install in order to compile (it seems I have none)? I must admit that I'm not skilled in compiling stuff, and I am a PD newbie, as I was attracted especially by the possibility of linking PD real time and GUI capabilities with algos composing by python (which I use in non real time mode audio manipulation). Anycase, I tried to decipher instructions. Could anyone give some hints? (or maybe some link. Maybe it has already been convered elsewhere?). Thanks a lot Best -a-

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pdp and webcams (was: Re: Still trying to get pdp to run)
by Tom Schouten 28 Jul '04

28 Jul '04

hi jim, try to send a 'captureformat RGB24' or 'captureformat RGB32' the the pdp_v4l object. if that doesn't help, it means your camera is either too new (and has only a video4linux2 driver), or it doesn't support double buffered capturing, which is implicitly assumed in pdp_v4l, or has a broken driver. if it's the double buffering, it means you're stuck. maybe i will support it later, but that's no priority for me now. consider buying a camera with a philips chipset. they are a little more expensive, but it's worth it. it's decent hardware, but more importantly, there's a good driver that supports its special features. this driver is explicitly supported in pdp. the driver is called 'pwc' and is in the kernel. the proprietary codec is supported in the 'pwcx' module. they have built-in compression which makes it possible to have a relatively high framerate for a webcam: 27fps at 320x240 compared to 10 for the cheap ones. i don't know if there are any other driver/camera combinations that can do this. and no, i'm not payed by philips, but as far as i can see, it's the only thing that really works well, despite the fact that there's non-open source part that makes it go that extra mile.. see http://www.smcc.demon.nl/webcam/ for a list of cameras supported by the pwc/pwcx driver. cheers, tom On Sun, 25 Jul 2004, jim ruxton wrote: > I'm still trying to figure out why nothing is in the video window. Any > thoughts where I should start to look. > Jim > > I thought I had succeeded but when I try to look for an image in an > example patch (input_output.pd) I don't see it. Below is what I get in > the terminal window after creating a window opening pdp_v4l and banging > it once. I tried pdp_xv and pdp_glx with no luck. I can see the video > with Gem and xawtv so I think video4linux is ok. Any thought where I > should start to look for problems. I'm using a logitech usb based > webcam. > Jim > Sample width set to 2 bytes > PDP: pure data packet > PDP: version 0.12.3 > pdp_xvideo: grabbed port 61 on adaptor 0 > pdp_v4l: opening /dev/video0 > pdp_v4l: cap: name Logitech USB Camera type 513 channels 1 maxw 352 maxh > 292 minw 32 minh 32 > pdp_v4l: picture: brightness 32767 depth 24 palette 4 > pdp_v4l: channel 0 name Camera type 2 flags 0 > pdp_v4l: switched to channel 0 > pdp_v4l: set norm to 0 > pdp_v4l: buffer size 426240, frames 1, offset 0 0 > pdp_v4l: using VIDEO_PALETTE_YUV422 > pdp_v4l: frame 0 0, format 7, width 320, height 240 > pdp_v4l: Opened video connection (320x240) > pdp_v4l: VIDIOCMCAPTURE: Invalid argument > pdp_v4l: VIDIOCMCAPTURE2: Invalid argument > pdp_v4l: frame 1 1, format 7, width 320, height 240 > pdp_v4l: VIDIOCSYNC: Bad file descriptor > pdp_v4l: no device opened > pdp_v4l: attempting auto open > pdp_v4l: opening /dev/video0 > pdp_v4l: cap: name Logitech USB Camera type 513 channels 1 maxw 352 maxh > 292 minw 32 minh 32 > pdp_v4l: picture: brightness 32767 depth 24 palette 4 > pdp_v4l: channel 0 name Camera type 2 flags 0 > pdp_v4l: switched to channel 0 > pdp_v4l: set norm to 0 > pdp_v4l: buffer size 426240, frames 1, offset 0 0 > pdp_v4l: using VIDEO_PALETTE_YUV422 > pdp_v4l: frame 0 0, format 7, width 320, height 240 > pdp_v4l: Opened video connection (320x240) > pdp_v4l: VIDIOCMCAPTURE: Invalid argument > pdp_v4l: VIDIOCMCAPTURE2: Invalid argument > pdp_v4l: frame 1 1, format 7, width 320, height 240 > pdp_v4l: VIDIOCSYNC: Bad file descriptor > pdp_v4l: auto open failed >

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uPDated
by martin pichlmair 27 Jul '04

27 Jul '04

hi, i am having a strange bug with pd (in the uPDated version) on os x. some abstractions do not display. i can open them (via context menu) and even connect patch chords to them. yet the object is not drawn. it only happens with abstractions as far as i've experienced this bug. and it is reproducible. it does not happen with all abstractions. anyone else seen this? martin attacksyour.net/pi

2 1

Dynamic population of a large array
by acabrera＠teleset.com.co 27 Jul '04

27 Jul '04

Hi all, I'm trying to build a "spectral delay" and to separate the fft analysis into "bands" I'm planning on multyplying the output of rfft by arrays (read with tableread~). These arrays contain as many points as there are fft bins. So my question is: Is there a quick way to populate arrays (1024 points in size) so that between x-value 'a' and x-value 'b' I have a y-value of 1, while the rest of the array is set to 0? I also want to be able control the values of a and b, so the band can be changed dynamically. Any help is very appreciated, as I cannot think of a simple straigthforward way. Thanks, Andres

3 2

OS X performance
by cr 27 Jul '04

27 Jul '04

>?Yesterday I tried pd 0.37-1 from Miller's site in a >?Powerbook G4 (1GHz). I compared the cpu usage with patch 08.convobros.pd >?.and I saw a big difference. In the Linux system it uses about 0.1% and >?in the G4 1 ghz about 20%. Why this big difference ? Should I use a G4 >?optimized pd or should I tweak the OSX system ? convobros uses 12-15% cpu on 262mhz g3 , debian, gcc 3.3.3 -funroll-loops. re g4: there are some SIMD optimizations from Thomas Grill available from the sourceforge CVS pd -r devel_0_37 you may want to try, which will work w/ Altivec on the G4. haven't tried them, perhaps someone who has has some numbers..., i think linux + SIMD/Altivec stuff enabled would put your performance in line with the PC.

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pd os x loading externals failure
by Christian Klotz 27 Jul '04

27 Jul '04

hi, I was wondering why pd isnt loading all the externals Hans-Christoph Steiner includes in his os x installer. using der -verbose flag pd gives a really long message of trying to load the externals like this tried /usr/local/lib/pd/extra/vpicture.pd and failed tried vst~.pd and failed tried /usr/local/lib/pd/extra/vst~.pd and failed tried /usr/local/lib/pd/extra/vst~.pd and failed tried waveform~.pd and failed tried /usr/local/lib/pd/extra/waveform~.pd and failed tried /usr/local/lib/pd/extra/waveform~.pd and failed does anybody know how to solve the problem, getting pd to load the externals. cheers, christian klotz

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Pd-list July 2004