[LAU] xrun problems. (Was Re: Introduction to Ardour 3.0 MIDI)

[Bernardo Barros]

No, with frame/period of 2 it also *seems* to work.
I tried jack_delay, it returns me this whatever frames/period I try.
What that means?

capture latency  = 1024
playback_latency = 1024
Signal below threshold...
Signal below threshold...
Signal below threshold...
Signal below threshold...
Signal below threshold...
Signal below threshold...


2011/4/2, Robin Gareus <robin at gareus.org>:
> On 04/03/2011 12:52 AM, Bernardo Barros wrote:
>> I would be very embarrassed if I'm fooling myself, but from what I
>> read the information provided by qjackctl, is this really the latency
>> of the audio system as low as 0.08ms with frames/period of 2! :S
>
> must be a typo:  2*16/ 44100Hz = 0.725ms = ~0.8ms
>
> Measure it with 'jack_delay' [1]. The number given in qjackctl's setup
> dialog is the nominal latency; and the time between two jack cycles.
>
> Usually there's additional latency due to [PCI|USB] bus overhead,
> sound-card & ALSA buffering, DAC/ADCs, etc. - around 1 ms round-trip for
> PCI devices.
> http://wiki.linuxaudio.org/wiki/jack_latency_tests
>
> have fun,
> robin
>
>
> [1] http://kokkinizita.linuxaudio.org/linuxaudio/index.html
>