Re: [FFADO-user] FFADO with Jackdmp

[Dominic S. <dom...@gm...>]

On Thursday 18 September 2008 02:24:47 Eric Shattow wrote:
> My command line is: jackd -v -R -d firewire -r 44100 -p 512 -n 2 -v6
>
> The latency depends on the samplerate, periodsize, and number of periods.
> In theory you can get down to about 4-5ms with IEEE1394 interface.
>
> Formula of latency (in ms) is:   (SampleRate * FramesPerPeriod * 1000) /
> NumPeriods
>
> The last experiment I did with this at 44100 sample rates, I was only
> able to start jackd with certain configurations.

I finally got "-r 48000 -p 128 -n 3" to work by running Jackdmp in 
synchronous mode (-S). Still no success in asynchronous mode.

Have you been able to run Jack or Jackdmp in any configuration with less 
than 128 frames per period?
I'm wondering why 48000/64/3 fails to start, although 96000/128/3 (which 
should give the same latency, right?) appears works without problems.


Dominic