[PD] : pd + sc with jackd

[miquel parera]

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 <pedro.lopes at ist.utl.pt>

> 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 <noishx at gmail.com> 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
>>
>> _______________________________________________
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>>
>
>
> --
> Pedro Lopes (MSc)
> contact: pedro.lopes at ist.utl.pt
> website: http://web.ist.utl.pt/Pedro.Lopes
>



-- 
Creative Commons & Open Source experimental electronic & computer sounds.

http://musicnumbers.wordpress.com/
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