2 things: - the "snd_pcm_open (output): Device or resource busy" issue is, as Iohannes said, due to the -nogui bug. Put a delay on your "dsp 1" message. I use 100 ms.
- the crackles are probably coming from dropouts due to pd not running in realtime. Try this and use alsa: http://puredata.info/docs/tutorials/HowToRunPDWithRealtimePriorityInUbuntu . I have not problem on a slow machine using alsa and -rt without Jack. On Jul 9, 2010, at 1:01 PM, Damian Stewart wrote: > hi all, > > i'm trying to get Pd to run on my BeagleBoard, and running into a couple of > problems. any help greatly appreciated. this is for an installation of this > work: http://ll.frey.co.nz which is due to go live in August at Kapelica > Gallery in Ljubljana, Slovenia. > > basically, the problem is that instead of sound output i'm getting these > crackles: > http://soundcloud.com/damian/pure-data-on-beagleboard-sound-issue > > 1. i tried Hans' Reware image ("BeagleBoard Pd, Python, Lua image" from here > http://dev.eyebeam.org/projects/reware/wiki/Releases ). i'm not sure what > version of Pd this is, but it's using OSS as sound device. this makes nasty > crackles, that are related to the volume of the sound output and also to the > content of the sound i'm trying to output. the crackles don't go away if i > increase the audio buffer to 500ms. they sound a bit like a pot full of > popping popcorn : > http://soundcloud.com/damian/pure-data-on-beagleboard-sound-issue > > 2a. (Ubuntu 10.04 installation) i tried apt-get install puredata (v. 0.42-5) > on my Ubuntu install, which produces the same kind of audio crackles as the > Reware image. > > 2b. (after sudo killall xdm) i tried running pd -nogui -alsa -noadc -open > my_test_patch.pd, which gives me no sound output at all, just a message that > "snd_pcm_open (output): Device or resource busy". > > i know Alsa is working on the Ubuntu install because i can use aplay and > mpg123 and get perfect sound output. i don't seem to have OSS available on > the Ubuntu image. > > i'm running a BeagleBoard C4, and i wonder if the Reware image was only > tested on an earlier revision board. > > again -- any help greatly appreciated! > > thanks > damian > > -- > damian stewart . @damiannz . [email protected] > frey . contemporary art . http://www.frey.co.nz > > > > -------- Dan Wilcox danomatika.com robotcowboy.com
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