[LAU] using Jack an interface to ecasound

Tweed tweed at lollipopfactory.com
Tue Jan 17 11:17:26 UTC 2017

On 01/17/2017 04:35 AM, john gibby wrote:
> Sound is via ALC 1150 chipset; I don't think that's the problem.  When 
> I go directly from pianoteq to alsa there's no problem; can use even a 
> 64 sample buffer.  Maybe I need a little help in killing the default 
> jack server and starting it back (with dummy back end ) using direct 
> jackd command line instead of using qjackctl?  Then I think it may 
> keep my specified buffer size.  Am Linux newby, takes a little work! :)
> On Jan 17, 2017 4:23 AM, "Jeanette C." <julien at mail.upb.de 
> <mailto:julien at mail.upb.de>> wrote:
>     Jan 17 2017, john gibby has written:
>     ...
>             When qjackctl brings up
>             the jack server, the buffer size gets overridden to 1024;
>             I see the message
>             in the log. What am I doing wrong?  Is Jack the wrong
>             approach, when it is
>             ecasound, not jack, that writes to alsa?
>     Hi John,
>     it appears that your soundcard is the problem. I've only started
>     JACK on
>     the commandline or through a dedicated start script, not using
>     qjackctl
>     or other JACK-supplied tools. But if you give a buffersize to JACK it
>     will honour that buffersize, if the soundcard can stand it. I haven't
>     seen an application before that couldn't honour JACK's buffersize,
>     whatever it is. Especially Ecasound can certainly go down to 64
>     samples.
>     What soundcard do you have? Have you tried starting JACK for your
>     soundcard on the commandline and see what happens?
>     jackd --timeout 4500 -R -d alsa -d hw:0 -p 128
>     Assuming that your soundcard is the first one (hw:0).
>     I have no experience with Pianoteq, but since it is meant as a
>     realtime
>     app, it should make sure that its sounds are played back without delay
>     or with minimal delay. 128 and even 64 samples aren't that uncommon.
>     ...
>     Best wishes,
>     Jeanette
>     --------
>     When you need someone, you just turn around and I will be there <3
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> Linux-audio-user at lists.linuxaudio.org
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maybe a jackdbus thing?  if you're using jack2, what does "jack_control 
status" show?

if it says "started",  do "jack_control stop" then try your jack 


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