[LAU] Getting Rhythmbox to Appear in qjackctl

Stuart Longland stuartl at longlandclan.id.au
Sun May 24 01:32:49 CEST 2020

On 24/5/20 8:21 am, Paul Davis wrote:
> I've already tried to point out the basics but I guess my hints weren't
> taken:
> * RB uses gstreamer for audio I/O
> * gstreamer has a native JACK module
> * you need to configure gstreamer's JACK module (the buffer sizes in
> particular need attention)

Don't disagree on those points, you're 100% correct on the existence of
a JACK plug-in for GStreamer and GStreamer's role in audio transport for

> * you need to tell RB to use the module (or tell gstreamer to do that all
> the time)

This is where we have a sticking point.  If there's a way to configure
that in RhythmBox, it is *well* hidden.  Fur sure, if you can get into
GStreamer's code and change the flow graph so it terminates with JACK,
then yes, it definitely will stream to JACK directly.

I just had a look at the sources for RhythmBox… it uses autoaudiosink
(see backends/gstreamer/rb-player-gst.c 683-713), which in theory could
use the JACK sink plug-in, and might do so in some circumstances.

The sticking point is
provides no way to elect JACK as the preferred output.  It's not obvious
how the user directs the audio to their _preferred_ output channel.
Stuart Longland (aka Redhatter, VK4MSL)

I haven't lost my mind...
  ...it's backed up on a tape somewhere.

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