Pd-list February 2000

pd-list@lists.iem.at

28 participants
26 discussions

texturing video onto rectangular area
by James Rojsirivat 21 Feb '00

21 Feb '00

hello, i'm working on a project and need some advice. in the gem_movie.pd, the example has the movie file textured onto the <cube> object...in a version of the same project i'm working on, i used the <square> object onto which my file is textured. However, ideally, i'd like the movie to retain its shape. in the current version i'm working on, i have the <pix_movie> object connected to a <polygon> with an argument of <4>. the x y z coordinates are assigned so that z = 0. the problem is that when i render, i can't get anything to show up on the screen. what am i doing wrong? i'm including the video section of the program. any help is greatly appreciated. also, is there a way to create a CASE like statement in pd? i'm using <moses> at the moment, and it seems awfully clunky. james #N canvas 130 98 600 500 10; #X msg 322 41 bang; #X floatatom 110 127; #X msg 371 39 stop; #X obj 321 66 metro 1000; #X obj 110 100 random 255; #X floatatom 86 267; #X obj 86 241 + 1; #X msg 90 184 bang; #X obj 86 215 float; #X obj 110 153 moses 100; #X msg 128 268 0; #X msg 144 128 0; #X text 220 4 February 20 \, 2000::simulates sensors; #X floatatom 361 217; #X obj 361 191 + 1; #X msg 365 134 bang; #X obj 361 165 float; #X msg 403 218 0; #X obj 366 104 moses 200; #X floatatom 456 219; #X obj 456 193 + 1; #X msg 460 136 bang; #X obj 456 167 float; #X msg 498 220 0; #X obj 461 106 moses 255; #N canvas 213 32 608 494 video 0; #X msg 51 32 1; #X msg 59 68 0; #X msg 101 41 create; #X msg 102 87 destroy; #X obj 223 61 gemhead; #X floatatom 351 135; #X obj 351 104 counter 0 85; #X msg 351 27 1; #X msg 386 26 0; #X obj 351 67 metro 50; #X text 392 135 control which frame; #X msg 287 196 0 0 0; #X msg 305 294 600 400 0; #X msg 305 261 0 400 0; #X msg 298 228 600 0 0; #X msg 110 128 dimen 600 400; #X msg 11 121 border 0; #X obj 219 320 polygon 4; #X obj 223 167 pix_movie homer.avi; #X obj 42 157 gemwin; #X connect 0 0 19 0; #X connect 1 0 19 0; #X connect 2 0 19 0; #X connect 3 0 19 0; #X connect 4 0 18 0; #X connect 5 0 18 1; #X connect 6 0 5 0; #X connect 7 0 9 0; #X connect 8 0 9 0; #X connect 9 0 6 0; #X connect 11 0 17 1; #X connect 12 0 17 4; #X connect 13 0 17 3; #X connect 14 0 17 2; #X connect 15 0 19 0; #X connect 16 0 19 0; #X connect 18 0 17 0; #X restore 12 22 pd video; #N canvas 0 0 600 400 audio 0; #X restore 13 47 pd audio; #X obj 7 300 moses 20; #X obj 71 300 moses 40; #X obj 135 300 moses 60; #X obj 198 300 moses 80; #X obj 261 300 moses 100; #X obj 225 239 select 100; #X connect 0 0 3 0; #X connect 1 0 9 0; #X connect 2 0 3 0; #X connect 3 0 4 0; #X connect 4 0 1 0; #X connect 5 0 27 0; #X connect 6 0 5 0; #X connect 6 0 8 1; #X connect 6 0 32 0; #X connect 7 0 8 0; #X connect 8 0 6 0; #X connect 9 0 7 0; #X connect 9 1 18 0; #X connect 10 0 5 0; #X connect 11 0 1 0; #X connect 14 0 13 0; #X connect 14 0 16 1; #X connect 14 0 32 0; #X connect 15 0 16 0; #X connect 16 0 14 0; #X connect 17 0 13 0; #X connect 18 0 15 0; #X connect 18 1 24 0; #X connect 20 0 19 0; #X connect 20 0 22 1; #X connect 20 0 32 0; #X connect 21 0 22 0; #X connect 22 0 20 0; #X connect 23 0 19 0; #X connect 24 0 21 0; #X connect 27 1 28 0; #X connect 28 1 29 0; #X connect 29 1 30 0; #X connect 30 1 31 0; #X connect 32 0 2 0;

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RCA project
by andreas raptopoulos 18 Feb '00

18 Feb '00

Hi all, During the last 18 months, I have been working on a Royal College of Art project dealing with real-time noise transformations. The core idea of the project is to do with creating music real-time, using ambient Noise as the input and so far we have been using MAX/MSP to build the reactive algorithms. We are now setting up a team in London to take the project further and would like to cooperate with someone with good knowledge of singal processing techniques. We are trying to find someone that can become a member of our team and work with us here in London on a joint venture between the Royal College of Art and a U.S. company. The first phase of project development will be of 3-months duration starting 13 March. If anybody is interested, please e-mail me at araptopoulos(a)hotmail.com Thanks, Andreas Raptopoulos ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

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question: should toys be part of Pd distribution?
by Miller Puckette 17 Feb '00

17 Feb '00

Hi Pd-ers, would it be more convenient for you if I integrated "toys" (the pitch tracker, expr, and other really useful things) as part of the Pd distribution? It would make the distribution grow by 150K or so... I'm raising the question because I'm writing a phase object for sampling (which someone suggested here a year or so ago) and want to put something in "soundfile-tools" in the pd distribution which uses the new object... it seems as if that would be a good reason to put "toys" in the distribution of Pd... cheers Miller

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RE: gem_video
by Mark Danks 16 Feb '00

16 Feb '00

First off, I'm glad that you were able to get anything working at all. For most people it takes some fixes and hacks to get it going. There are massive problems getting pix_video to work under Windows. In a nut shell, the Windows system was never designed to get the actual pixel data from a video stream. It assumes that it is either going directly to the screen or to a hard drive...without the program ever modifing the actual data. GEM has to go through a number of hoops and jumps to get anything to work. My machine will often lock up when I use pix_video. I would welcome any suggestions on how to make it work better... Okay, now for the specific issues. > -----Original Message----- > From: umläute [mailto:zmoelnig@iem.mhsg.ac.at] > Subject: gem_video > > > hw-specs: > PII - 350MHz > guillemot 3d prophet geForce256 DDR-DVI (should be fast enough) Yep, a geForce is the best card you could use for GEM right now. > Trying pix_video i have a few problems concerning speed; > the very maximum i could do is 320 * 240 pixes (but this might be > because of the poor TV-card or because i haven't found the correct > software to change this)....should it be possible to change > the dimen of the captured video from within gem ? In the SGI version, the video driver will do the actual resizing. Under Windows, it doesn't seem to be the case. The max that pix_video supports is 320x240 because it has to set the size when the object is created. If you try to make it larger, pix_video should complain about "not enough pixels or something". I can look into this, such as detaching from the capture stream and recreating it at a different size. I have noticed that internally running at number other than 320x240 or 640x480 (NTSC resolution) makes the operating system unstable here in the States. I need to finish up the PAL support in the object though... <snip> > the frame-rate is something very weird, i already did 20-25 frames,and > it only used 80-83% of my cpu; but it wasn't really smooth, and > smoothiness did NOT CHANGE by doing a frame-rate of only 15. Neither > changed the cpu-load (witch was very ok, for everything reacted quite > fast) > > then SUDDENLY, the video came in *quite* smooth, and the cpu-load > exploded to 100%; again now real changes for various frame-sizes > (except, of course, that at 15frm/sec it wasn't smooth any longer, but > load stayed at 100% !). > I don't have any idea, why the behaviour changed; (by the way, > *yesterday* i had a constant cpu-load of 100%) Not certain what is going on here. Because GEM needs the actual pixel data, there always seems to be a high over head rate, but that is higher than I have seen before. <snip> > just adding one or two gem-objects) i would highly appreciate any > solution that will cost nothing (you know, watching TV on the pc isn't > very hard work for the cpu too), so is there any possibility to do a As mentioned above, Windows freaks out if you actually want the pixel data, as opposed to going directly to screen or disk. To say that the Windows media library is poorly designed and buggy is a massive understatement. I got spoiled working with SGI's video library, which worked really well and was extremely stable. > very simple pass-through, or where can I save calculations (p.e. do we > really have to copy the captured frame into an internal > rgbA-buffer; or is this less important ?) The copy is needed for a couple of reasons. One, the frame data is invalid after the callback is done. Two, the frame data is BGR, while the rest of GEM is always expecting RGBA or Greyscale. In theory, it would be possible to just blast it to a texture binding (there is an imageInPlace object which does this) One problem though, is that GEM never knows when the callback is occuring because the system triggers it. I have been meaning to go back and look at this. Sounds like it is about time. There may be some way to do this in DirectX3 or something (shudder)...I'll have to look. Let me know what other problems or sucesses you have. Later, Mark ============================ = mdanks(a)stormfront.com = http://www.danks.org/mark ============================

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gem_video
by unknown＠example.com 16 Feb '00

16 Feb '00

Hi ! Actually, i'm experimentig a little bit with gem + video; hw-specs: PII - 350MHz guillemot 3d prophet geForce256 DDR-DVI (should be fast enough) hauppauge WinTV primio (the cheapest one i could get with TV-IN) WinNT Trying pix_video i have a few problems concerning speed; the very maximum i could do is 320 * 240 pixes (but this might be because of the poor TV-card or because i haven't found the correct software to change this)....should it be possible to change the dimen of the captured video from within gem ? when loading the patch i get a "connected to video at 320 240" or something very similar; when i try to change the dimen and start rendering, i will get the permanent error "pix_video:: couldn't capture enough pixels" (or simile) the frame-rate is something very weird, i already did 20-25 frames,and it only used 80-83% of my cpu; but it wasn't really smooth, and smoothiness did NOT CHANGE by doing a frame-rate of only 15. Neither changed the cpu-load (witch was very ok, for everything reacted quite fast) then SUDDENLY, the video came in *quite* smooth, and the cpu-load exploded to 100%; again now real changes for various frame-sizes (except, of course, that at 15frm/sec it wasn't smooth any longer, but load stayed at 100% !). I don't have any idea, why the behaviour changed; (by the way, *yesterday* i had a constant cpu-load of 100%) since i only will pass through the video-signal (and do nothing with it, just adding one or two gem-objects) i would highly appreciate any solution that will cost nothing (you know, watching TV on the pc isn't very hard work for the cpu too), so is there any possibility to do a very simple pass-through, or where can I save calculations (p.e. do we really have to copy the captured frame into an internal rgbA-buffer; or is this less important ?) when i now try the whole patch (that is:: pass through the video signal; render a simple model; do very few calcs on audio), the video will freeze after some (or one (?)) frame.s, the rest will be VERY slow; mfg hannes of course i have removed all the float-guis

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Re: PPC Linux and PD
by Garry Kling 16 Feb '00

16 Feb '00

Getting PD to run on a PPC with Linux *should* be this simple: from Miller: Startup PD with the -frags 4 option and in s_linux.c, changing the format "AFMT_S16_LE" to "AFMT_S16_NE". What I meant by editing the makefile was just changing it so that it has the right pathname for the standard libraries. i.e. change all the occurences of .../redhat-i586-linux/... (or whatever it is) to .../yld-ppc-linux/... or wherever your libraries are located. The compiler will give you an error if you miss one, so the mistakes are easy to fine. I might add that this worked on my system, which is a powerbook G3 266 with YellowDog linux, with just the standard OSS sound driver. I have yet to tackle MIDI... If this is info isn't clear enough, pester me again. Good luck! Garry Kling klingg(a)cwu.edu

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Absolute time and readsf~ and a sequenser
by Jørgen Mortensen 14 Feb '00

14 Feb '00

Hi! For an installation I could use to know the absolute time - get it and at that spot play one or more soundfiles. Is there a way to get the absolute time, and is there a simple way to play soundfiles The readsf~ object does not seem to exist anymore, at least for Windows. And another thing I am a bit ashamed over - in MAX i often used the seqenser object to get some weird structures in a MIDI file and work on them for instrumental music. Could there be a little sequenser in pd too? Greetings from Joergen

2 2

tcl/tk to C
by Elliot Anderson 13 Feb '00

13 Feb '00

I am attempting to add to the serial object under NT a routine that reads the serial port. I have values coming into tcl/tk; how to get them into the C code so I can send out the serial object? I know that there's a command called PD that is added to tcl/tk, however, I don't understand the syntax. This is my first experience with tcl/tk. Also, I noticed that the C code uses sys_gui to send messages/strings to tcl/tk, but I can't figure out how to send strings from tcl/tk to the C serial code. I need to read and write to a multiport serial card that has sonar sensors attached to each port. I also need to read and write to a laser disc player based on the sonar information. I'm setting up and installation in two weeks and this is the sticking point. I have the serial stuff working under Linux, however, there isn't a Linux driver for my multiport card. Therefore, I'm stuck using NT. Thanks, Elliot Elliot Anderson Lecturer, Electronic Media University of California, Santa Cruz (831) 459-2955 ewanders(a)cats.ucsc.edu www.sirus.com/~ewanders

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Re: PPC and PD
by Garry Kling 13 Feb '00

13 Feb '00

I installed PD on a PB G3 this winter, although with YellowDog linux. All you have to do is some basic makefile editing and change the name of one of the constants and it should work fine. Look at the PD archives from late nov/early dec for the full info. Garry Kling klingg(a)cwu.edu //I remember some activity on the list a while ago //on this subject.

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PPC and PD
by Michael Thompson 12 Feb '00

12 Feb '00

Audio on LinuxPPC and pd? If so, where is the patch for the broken oss drivers on linuxPPC? or the code to make pd work on LinuxPPC? I remember some activity on the list a while ago on this subject. thanks, Michael

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Pd-list February 2000