thanks pedro for the explanation: I agree it's a hardware problem, to find the exact configuration. mail lists are a great way to see the problem from another perspective, for example, I never thought to increase the rate to 48000, if a smaller number gave problems
a good solution to the difference between computers could be used in all the same audio card, but I think it is a utopia. Does anyone have experience in this regard? my solution is: with sudo without rt patch 1. jackd -R -P14 -dalsa -dhw:0 -r48000 -p2048 -n4 -P 2. emacs -sclang 3. pdextended -jack -channels 2 -r 48000 2010/12/30 Pedro Lopes <[email protected]> > I use both in Karmic (patched with rt) on a cheap Toshiba AMD Dual core and > Maverick (no patch yet) on a stronger dual core VAIO. > > Now some considerations: > - on Toshiba (weakest link)> > - with on board card, I set the qjackctl values such as the latency rises > a bit, but stays stable without DIO errors or xruns (as jack call's it). The > rate is set at 44.1k, but is not what drives latency the most. The buffer > size and period will determine the latency value (on the down-right corner > qjackctl predicts the latency). I use about 1024 or 2048 samples on the > buffer length and a 3 period. Yes I know its high, but its hyper stable. > - with a simple USB card (H4 recorder) I can really lower the latency a > lot, I can usually manage it down to 20ms and remain really stable without > DIO and xruns. > > - on VAIO (strongest link) > - the computer is so fast that even with onboard sound card and without > rt I can run jack + pd + sc with an acceptable latency. I just installed sc > to test both systems in parallel, runned a couple of sc140 code in parallel, > and some of my medium load pd patches, also started up moc player, all with > 30 ms of latency and without any DIO or xrun. So it all depends on a lot of > hardware capabilities and of course some fine tuning of your jack + > soundcard settings. Attached is an image of pd + sc on maverick in my VAIO. > > best regards > Pedro > p.s.: note on the image that although qjack is running with jack realtime > enabled but the kernel is not patched for rt. > > On Thu, Dec 30, 2010 at 1:04 PM, oskoff lovich <[email protected]> wrote: > >> Hi Miquel and all, >> sometimes i used sc and puredata with jackd >> >> and they work very good,, >> >> with ubuntu karmic koala 9.10 in a cheap acer laptop >> >> i usually open first jack at 48000 sample rate, >> then supercollider and after pd -jack >> >> maybe is a problem with diferent sample rate options >> or try with diferents settings of jack ( on/off realtime ect) >> >> salut! >> >> >> >> >> zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz >> >> Hello. >> >> I use pd plus sc in puredyne and maverick. The OSC communication is fine and >> fast, but the audio in puredata is plenty of dio errors. >> >> I have tried many combinations of command line options, with jackd and with >> pd. >> >> I have compiled and jackd and puredata. >> >> Someone is using these two environments, whitou audio problems? How? In what >> operating system? With that computer? >> >> Thanks. >> >> >> >> >> >> -- >> >>>http://noconventions.mobi/noish >> >> _______________________________________________ >> [email protected] mailing list >> UNSUBSCRIBE and account-management -> >> http://lists.puredata.info/listinfo/pd-list >> >> > > > -- > Pedro Lopes (MSc) > contact: [email protected] > website: http://web.ist.utl.pt/Pedro.Lopes > -- Creative Commons & Open Source experimental electronic & computer sounds. http://musicnumbers.wordpress.com/
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