[LAU] Jack max ports question

[Paul Davis]

the -p (port max) is an argument to the SERVER, not the backend. jack
command line syntax:

   jackd [ SERVER ARGUMENTS ] -d BACKEND [ BACKEND ARGUMENTS ]

the -p should come before the -d.

On Fri, Jul 31, 2015 at 6:59 PM, Peter P. <peterparker at fastmail.com> wrote:
> Hi list,
>
> today I got some time to play around with RME's Madiface (and its
> ExpressCard) under Linux/Jack. The card uses Thomas' old hdspmixer with
> correct display and routing abilities, it's simply awesome to have 64Ins
> and 64outs on a Linux laptop!
>
> However I didn't get beyond the following weird problem:
>
> Starting PureData outputting 64 channels via jack as
>         pd -jack -channels 64
> works and connects and outputs to the Madiface's hardware outs.
>
> If I try to start other audio software (mplayer, alsaplayer) asking them
> to output to the first two jack outputs (while Pd is also using them),
> I get in qjackctl's message window
>         no ports available!
>
> and in mplayer
>         cannot deliver port registration request
>         [JACK] not enough ports available
>         Failed to initialize audio driver 'jack'
>
> and in alsaplayer
>         cannot deliver port registration request
>         cannot deliver port registration request
>         Segmentation fault
>
> all followed by a massive xrun in qjackctls message window
>         **** alsa_pcm: xrun of at least 4995.700 msecs
>
> Now if I start Pd with less outputs, for examples
>         pd -jack -channels 32
> then mplayer is perfectly able to output on the the first two hardware
> channels in parallel with Pd.
>
> The weird thing: Jackd's 'max port' argument is set to 256, and the problem persists
> also with 512 ports.
>
> Am I missing something here?
>
> Background info:
> jackd version 0.124.1 tmpdir /dev/shm protocol 25
>
> is started via qjackctl as
>         jackd -P89 -t5000 -dalsa -r44100 -p256 -n2 -D -Chw:Default -Phw:Default -i64 -o64
>
> on kernel
>         3.14-2-rt-amd64 #1 SMP PREEMPT RT Debian 3.14.15-2 (2014-08-09) x86_64 GNU/Linux
>
> Thank you for any suggestions!
> Peter
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