Luis de Bethencourt
luisbg at ubuntu.com
Fri May 2 14:23:12 BST 2008
On Fri, May 2, 2008 at 2:01 PM, ttoine at ttoine.net <ttoine at ttoine.net> wrote:
> It is not so easy. First of all, depending of the sound card chipset,
> some will start with a period at 2, some at 3. As there is no database
> about that point (I can't find one), anyone will have to test. It is a
> good idea imho to create a wiki page with the tested setting of the user
> community, but I don't know if it is easy to motivate people to fill that.
> Second point, it is not compulsory to have a real time kernell in order
> to start Jack. If well set up with a long latency (more than 60ms), it
> can starts and works very well too.
> Third point, the frames is the latest point to configure. I mean that
> first, one has to set up the sample frequency he wants to work with
> (44,1, 48, ...), then, try different period values (most of the time 2
> or 3). And then, when RT is activated, it is possible to decrease the
> frame value, so it will decrease the latency time. Basic sound cards
> (like integrated chipsets) will not work well at latency below 20ms. And
> some more professional sound chipset (M-Audio envy24, RME hdsp, etc...)
> will start without matter at a period of 32 or 64, giving very low
> latency around 2 or 3 ms at 48khz.
> Depending the use, the latency has to be different. For example, if the
> aim of the session is only to record a live performance, one can work
> with a latency around 60ms to be sure of the quality of the result. If
> the aim is to work on multi audio tracks with re-recording of musicians,
> the lowest the latency is, the better it is for the musicians. And if
> one wants to use midi, he will have to work around 8 ms or 10 ms to
> avoid midi synchro problems.
> So it means that people will have to test a bit, and configure depending
> their sound card, and their need. And once it is well set up, it is
> possible to save profiles for several uses and sound cards. Then, using
> Patchage is not very difficult to explain.
> A few month ago, I tried to write something on the ubuntu help wiki. The
> problem is how to include on a ubuntu wiki page some screen capture ?
> IMHO, it will be hard to write a good stuff for beginners on Qjackctl
> without any screen capture. If you know how to do that, I would be glad
> to help you.
> hollunder at gmx.at a écrit :
> > Is the leader of the documentation team Murat Güneş? And if so, is he
> > still not available?
> > I feel the need to write a quick jack starter guide for new users,
> > which covers the absolute basics to work with jack. But I need some
> > advice, mainly because there are at least 3 articles that are similar,
> > but don't really do the trick. Additionally, I never edited a wiki
> > before.
> > The guide, as I imagine it, in short words:
> > 1. Make sure you have the rt-kernel
> > 2. Make the appropriate settings in ubuntu studio controls
> > 3. Make the necessary, stable settings in qjackctl, something like:
> > frames 1024, periods3, rt
> > 4. How to make basic connections using qjackctl, patchage
> > Similar Articles:
> > https://help.ubuntu.com/community/UbuntuStudio/GettingStarted
> > https://help.ubuntu.com/community/HowToJACKConfiguration
> > https://help.ubuntu.com/community/HowToQjackCtlConnections
> > Advice appreciated.
> > Best Regards,
> > Philipp
I also offer all of my help since this type of documentation is very needed.
Luis de Bethencourt
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Luis de Bethencourt Guimerá
<luisbg at ubuntu.com>
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