[LAU] make a VU meter listen to jack output ports

[Peter P.]

* Peter P. <peterparker at fastmail.com> [2015-06-14 13:00]:
> * Kjetil Matheussen <k.s.matheussen at gmail.com> [2015-06-14 09:03]:
> > Peter P:
> > 
> > > Hi list,
> > >
> > > I am wondering how I could make a VU meter automatically receive all
> > > audio that is sent to specific jack output ports by various
> > > applications, also from those that I will start later on a given day.
> > >
> > > thank you for all ideas!
> > >
> > 
> > Hi,
> > 
> > jack_capture is able to do exactly what you ask for.
> > jack_capture is mainly made for recording audio,
> > but to avoid recording anything, just run it in "timemachine"
> > mode:
> > 
> > $ jack_capture --meterbridge --timemachine --port system:playback_1 --port
> > system:playback_2
> > 
> > (make sure "meterbridge" is installed)
> 
> Thanks Kjetil,
> 
> I found out that meterbridge can connect to the system:playback_N ports
> itself, but running it via jack_capture gives me persistent connections.
> Thanks, this is great and works fine for me as 
> 
> jack_capture --meterbridge --meterbridge-type dpm --timemachine --port system:playback_1 --port system:playback_2 /dev/null

Strangely this does not work when I start it from fluxbox' menu, ie.
without a visible (x)terminal. The application (and hence the
meterbridge) close immediately. Do you have an idea why this could
happen?

Thanks Kjetil,
P