Pd-list October 2008

pd-list@lists.iem.at

109 participants
170 discussions

PD, arduino and sharp range detectors
by Tim Boykett 30 Oct '08

30 Oct '08

Hi All, We are having trouble with a PD - Arduino - Sharp IR gp2d12 IR range sensor. everything works for a while, then the arduino just stops and sometimes takes PD down with it. once we had a warning from the OS that there was too much current being sucked on the USB port. we are using three such things, each uses typically 33 and up to 50 mA. This should (according to the Arduino and USB specs) not be too much, but perhaps these are wrong. Any other ideas? I have heard of people using smoothing capacitors on the sharp sensors. Hmm, puzzled in Linz, Tim

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Re: [PD] glitches when moving between sub patches
by forwind 30 Oct '08

30 Oct '08

Hi Derek, > Did you try running as sudo or root? Of course! Just tried this and yes no clicks!!! Before I was using qjack ctrl to control jackd. What is strange is that when I run jackd from command line without sudo privileges there are no clicks either !? So following from that discovery it seems sudo privileges are not necessary to avoid the clicks but avoid the use of or running of qjackctrl under normal privileges to run the jack daemon. I wonder why this is ? odd - maintaining jack connections between apps will be a headache without the GUI. I suppose I could also start the qjackctrl from command line with sudo privileges ... thanks Derek, Conor

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Fwd: midi_sync_out
by mrtoftrash 30 Oct '08

30 Oct '08

For Linux, midiout only works in the latest TEST version of PD from Miller. Thomas

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Re: [PD] pd tools for syncing to video
by mrtoftrash 30 Oct '08

30 Oct '08

The pdmtl abstractions have gems.movies~ to sync/play audio files with movies. You can also use gems.movies with a 0-1 signal snapshot~ed to the frame input (in relative mode). Both abstractions will loop movies and audio files simultaneously, meaning, that if the audio is shorter than the movie, it will be played faster. Thomas

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usb midi device
by cyrille henry 30 Oct '08

30 Oct '08

hello, i've got a usb / midi device with 2 in and 2 out (bcf2000 by example, but i've got the same problem with other hardware). With pd/linux (ubuntu), i can't use the 2nd in / out : just the 1st one is usable. does anyone know how to use device with multiple midi in / out? thanks Cyrille

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Timing and PD....
by B. Bogart 30 Oct '08

30 Oct '08

Hey all, I'm having more and more problems with sync in PD. By sync I mean that parts of my patches have processing delays that mess up timing. In general I've been using buffers and delays to keep things working. This approach is not very scalable. I find myself using the "timer" object all the time to see if there is a processing delay I have to worry about. That is in cases where there is a bang saying an operation is done. Two examples I'm working on now (in Gem): First there is a delay between sending a message and the pix_buffer to store, and then again for pix_buffer_read to read the pixels. The delay is long enough that trigger does not work, there needs to be a delay to make sure the image in the buffer is the right one. (sometimes as much as 200ms) A second example is that I'm using pix_share and and second PD instance to offload some CPU usage. Making sure the image sent to that PD instance and the image received later in the chain is difficult. I'm not writing for specific advice, hence the generalities, but wanted to start a discussion on the issue. What is the long-term solution for PD to solve these issues? Should all objects that introduce a delay send a bang when they are complete? (for example pix_buffer? Of course an additional delay occurs when when the pix_buffer is written to memory and when it gets to the gfx card for display. I'm banging my head over these issues a lot lately and wonder if there is a better approach. Back to attempting kludging a solution. .b.

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glitches when moving between sub patches
by forwind 30 Oct '08

30 Oct '08

Hi all, At the moment I am attempting to refactor a patch. Part of this involves moving alot of the exposed functionality down into sub patches. I have noticed however after doing the patch work I get glitches when I open and close the sub patches. The machine should have no problems being a 64bit 8 gig . The distribution is 64studio 2. Audio is handled by jack. The limits.conf has : @audio - rtprio 99 @audio - memlock 250000 @audio - nice -10 the xwrapper.conf has: allowed_users=console nice_value=19 And fstab has: shmfs /dev/shm shm defaults 0 0 none /tmp/jack tmpfs defaults 0 0 none /mnt/ramfs tmpfs defaults 0 0 The graphics card is a nvidia GEForce 8600 GT running under the nvidia driver version 169.07. I suspect this is what is causing the glitches but don't know how I can stop it from 'getting in the way'. A last gasp effort could involve raising the nice value even more which past 19 might be a bit extreme ? Any ideas. There didn't seem to be any settings to optimise the graphics card through the nvidia control panel. Best regards, Conor

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DL.1 Digital Light and pure data
by Erich Berger 30 Oct '08

30 Oct '08

hello, did anybody work on controlling a dl1 projector via pd ? it is dmx controllable. http://www.highend.com/products/digital_lighting/dl_1.asp thx + best erich --------------------- http://randomseed.org

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5-7 Nov EuCuE concert series - La primauté de l’oreille/ Primacy of the ear
by Eldad Tsabary 30 Oct '08

30 Oct '08

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warmest reverb?
by Hans-Christoph Steiner 30 Oct '08

30 Oct '08

Hey all, I am currently working furiously on a sound design project. I used freeverb since it is quick and easy. But now I want to replace it with the warmest reverb Pd can offer. Any suggestions? .hc ------------------------------------------------------------------------ ---- "It is convenient to imagine a power beyond us because that means we don't have to examine our own lives.", from "The Idols of Environmentalism", by Curtis White

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Pd-list October 2008