Hans, thank you! We will try that. 2011/11/14 Hans-Christoph Steiner <h...@at.or.at>
> > from the cmd line: -rt hig priority, -nrt low. > > .hc > > On Nov 14, 2011, at 9:44 AM, Vilson Vieira wrote: > > How to set high priority for audio Pd instance and lower priority to the > other instance? > > All the best. > > 2011/11/14 Ricardo Fabbri <rfab...@gmail.com> > >> Thanks for the replies. >> >> problems solved by using 2 Pd instances, one for video, the other for >> audio, communicating via OSC on the same machine (or even different >> machines). The machine also had to have a better CPU as doing this on a >> slower dualcore laptop only fixed the audio, while the video got very slow. >> >> best, >> >> >> On Monday, November 14, 2011, Hans-Christoph Steiner <h...@at.or.at> >> wrote: >> > >> > I think generally, for gem + audio patches, people run two instances of >> Pd, one for Gem and the other for the audio. The audio instance has >> realtime priority, and the Gem one does not. >> > >> > .hc >> > >> > On Nov 13, 2011, at 10:17 PM, Ricardo Fabbri wrote: >> > >> >> Hi, >> >> >> >> I am building instalations/instruments which control sounds >> >> through the webcam, using a color detector that I submitted to this >> >> list a couple of days ago. Things work well, and I am just facing real >> >> time/delay issues now. >> >> When I try to generate sound with any pix >> >> processing, I am getting jumps in the sound (like on/off sounds at >> >> about 5-20Hz). Turning off any pix processing, the sound is then back >> >> to normal, even if I show the raw video from the camera on a gemwin. >> >> By pix processing I mean anything with even only 1 pass through the >> >> image on the CPU. I am using a ps3eye camera, which makes things >> >> better as it has a high framerate, but I still get interruptions in >> >> the sound. >> >> >> >> Why is this lag in the sound? The image with the output of the pix >> >> processing doesn't seem to be moving any slower with or without sound. >> >> >> >> What are your experiences in trying to get gem pix processing, video, >> >> and DSP to work in real time? My application is interactive, so that I >> >> really need the sound to be as smooth as possible. Here are some >> >> factors I will investigate, let me know if they make any sense to you: >> >> >> >> - It could be just too much data, even a single pass on each pixel >> >> could be causing delays/jumps. I could downsample the image prior to >> >> any pix processing >> >> - The kernel is too slow in processing the video stream; I tried '-rt' >> >> with no success >> >> - Perhaps there is a problem in Pd sound scheduling vs pix processing >> >> - Perhaps its just the CPU. In fact, I used OSC to do the video on one >> >> machine, send the parameters to a second machine which then processes >> >> the audio there. This effectively solved the problem. Question is, is >> >> this due to CPU or to another factor? >> >> >> >> I would really appreciate hearing ideas from you, as I am new to this. >> >> Best, >> >> Ricardo Fabbri >> >> -- >> >> Linux registered user #175401 >> >> www.lems.brown.edu/~rfabbri <http://www.lems.brown.edu/%7Erfabbri> >> >> labmacambira.sf.net >> >> >> >> _______________________________________________ >> >> GEM-dev mailing list >> >> gem-...@iem.at >> >> http://lists.puredata.info/listinfo/gem-dev >> > >> > >> > >> > >> ---------------------------------------------------------------------------- >> > >> > Computer science is no more related to the computer than astronomy is >> related to the telescope. -Edsger Dykstra >> > >> > >> > >> >> -- >> >> Ricardo Fabbri >> -- >> Linux registered user #175401 >> www.lems.brown.edu/~rfabbri <http://www.lems.brown.edu/%7Erfabbri> >> labmacambira.sf.net >> >> >> _______________________________________________ >> Pd-dev mailing list >> Pd-dev@iem.at >> http://lists.puredata.info/listinfo/pd-dev >> >> > > > -- > Vilson Vieira > > vil...@void.cc > > ((( http://automata.cc ))) > > ((( http://musa.cc ))) > > > > > > ---------------------------------------------------------------------------- > > Looking at things from a more basic level, you can come up with a more > direct solution... It may sound small in theory, but it in practice, it can > change entire economies. - Amy Smith > > > -- Vilson Vieira vil...@void.cc ((( http://automata.cc ))) ((( http://musa.cc )))
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