[Jack-Devel] Usage feasibility Q

[Hanspeter Portner]

On 28.01.2018 10:31, Robert Bielik wrote:
>> Now I'll just have to get jack to work at all on my platform (RPi3 +
>> Audioinjector Octocard), having trouble with dbus/X11 as I run Raspbian
>> Stretch headless...
> 
> Ok, speaking of which, apparently I need to use jackd2 (http://forum.audioinjector.net/viewtopic.php?f=5&t=16), but I have no X11 installed, which seems to be needed ?:

It's dbus that's needed, not X.

> pi at AccordPi:~ $ sudo jackd -d alsa
> 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 10
> self-connect-mode is "Don't restrict self connect requests"
> Failed to connect to session bus for device reservation /usr/bin/dbus-launch terminated abnormally with the following error: Autolaunch error: X11 initialization failed.
> 
> Audio device hw:0 cannot be acquired...
> Cannot initialize driver
> JackServer::Open failed with -1
> Failed to open server
> 
> Is there a way to get around this ?

There are many, here an incomplete selection:

1. use jack1
2. recompile jack2 without dbus support
3. hack around it [1]
4. use a dummy virtual X

[1] https://linuxmusicians.com/viewtopic.php?t=12821