Re: [LAU] [LAD] Document on using Jack Apps

On 1 August 2010 19:37, Arvind Venkatasubramanian <mdu.arvind@email-addr-hidden> wrote:

> Question on using QJACKctl:
> I was able to create some basic setting, load and read latency that gets
> printed on the terminal.  But what do the parameters on the setting tab of
> console pop up mean?  No soft mode, monitor, priority, time out etc and the
> options tab.  How do I use these options and tine tune them in order to set
> the minimum feasible latency for the application that I intend to develop?
>  Above all, if the drop down menu options does not allow me to choose lower
> sampling rates, what command do I use on the CLI to do the setting.  Or Do I
> need to edit QJACKctl's .conf file to set lower sampling rates manually.
> My Intel sound card supports sampling rates of 8kHz and 16 kHz.  I confirmed
> this by looking into Audacity device ID setting.  I know that I am asking
> some basic stuff but my problem is that I do not find the right
> documentation for solving my problems.

Typing in the console:

man jackd

will help you identify the nature of some of the command line options
for jack, as well as give you some clues for matching them to the tabs
within QjackCTL.

I'm no expert, and all I've ever tried for getting the best (lowest)
latency is by experimenting with seeing how low I can go with the
Frames/Period setting in QjackCTL which is the -p or --period setting
on the command line. If it works and no x-runs occur, then...
...it works :-)

A method of identifying which command line option to Jack relates to
which setting in QjackCTL is by changing a setting in qjackctl and
stop/starting Jack through qjackCTL while watching the messages log.

James.
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Received on Mon Aug 2 00:15:02 2010