linuxaudio.org

On Mon, Mar 04, 2013 at 10:53:30PM +0100, Chris Bungue wrote:
> I work with KXstudio and Unbuntu 12.04. Normally I think is on

quoted text
> KXstudio cadence the main tool for start and stop jack, but I like

> qjackct. Most of the time I use both tools. Now I have seen that

> cadence and qjackct shows different latency. Although both have the

> same settings. Cadence always shows exactly the half of the value than

> qjackct.

>

> Which latency value of both is right?

Depending on how you define latency both could be right.
Qjackctl shows the sum of input and output latency - the time a

signal takes from an input of your soundcard to an output if

you connect the corrsponding Jack ports [1].
I don't know Cadence but apparently it shows just the input

and/or output latency separately, or it gets it wrong.

If you use -n 2 (2 periods) then input and output latency

are equal. If n > 2 then they are not, and Cadence *should*

show two different values, and the sum of those should be the

value shown by Qjackctl.
So try -n 3 and see what Cadence tells you...
[1] ignoring any additional HW delays that ALSA/Jack/Qjackctl

don't know about. You can measure the real delay using jack_delay.
Ciao,
--

FA
A world of exhaustive, reliable metadata would be an utopia.

It's also a pipe-dream, founded on self-delusion, nerd hubris

and hysterically inflated market opportunities. (Cory Doctorow)
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