[Jack-Devel] audioadapter: quality setting important when not changing sampling frequency?

David Kastrup dak at gnu.org
Sat Sep 29 10:29:08 CEST 2018

Holger Marzen <holger at marzen.de> writes:

> On Fri, 28 Sep 2018, Holger Marzen wrote:
>> On Fri, 28 Sep 2018, Holger Marzen wrote:
>> > q2 (SRC_SINC_FASTEST) showed the desired flat envelope and seems to be
>> > the best compromise between CPU load and quality.
>> > 
>> > -> That's the setting I'll use from now on.
>> Unfortunately this leads to errors once in a while (although my Core i7
>> has no big CPU load), the ringbuffer increases up to 64k. So it's no
>> stable solution for me.
> It seems that playing with jackd's priority can cure the problem. I'll
> play around with the parms but this seems to be a good start. Maybe
> squeezelite, an audioplayer, was the cause because it was running at a
> higher priority than jackd.

Wouldn't jackd be running at realtime priority usually?

> jackdmp 1.9.11
> Copyright 2001-2005 Paul Davis and others.
> Copyright 2004-2014 Grame.
> jackdmp comes with ABSOLUTELY NO WARRANTY
> This is free software, and you are welcome to redistribute it
> under certain conditions; see the file COPYING for details
> JACK server starting in realtime mode with priority

Yup.  Is squeezelite also running with realtime priority?  That would
seem weird.  I mean, running an audioplayer while in a recording session
seems weird anyway.

David Kastrup

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