[Ardour-users] WAV files, xruns

[Jack O'Quin]

Anthony DiSante <orders at nodivisions.com> writes:

> So can I tell what latency I've achieved based on those numbers?  I've
> seen people on this list say, "I get X ms latency," etc.  Is there a
> formula?  I assume it's something divided by the sample rate (in kHz)
> in order to get a result in ms.

Right.  Check `man jackd'...

       -p, --period int
              Specify the number of frames between JACK process()
              calls.   The  default  is  1024.   If  you need low
              latency, set -p as low as you can go without seeing
              xruns.  A larger period size yields higher latency,
              but  makes  xruns  less  likely.   The  JACK  input
              latency in seconds is --period divided by --rate.

       -n, --nperiods int
              Specify the  number  of  periods  in  the  hardware
              buffer.   The  default  is 2.  The period size (-p)
              times --nperiods times four is the JACK buffer size
              in  bytes.   The  JACK output latency in seconds is
              --nperiods times --period divided by --rate.
-- 
  joq