On Tue, Aug 23, 2016 at 11:04 AM, Neil C Smith <neil@neilcsmith.net> wrote:

On 23 August 2016 at 15:52, Mac <ussndmac@charter.net> wrote:
> I think, in the past (ubuntu pre-16.04) there were settings musicaudiosink
> and audiosink that could specify which JACK sink was to be used by
> gstreamer.
>
> This changed the default behavior of gstreamer which was to connect to the
> first 2 sinks in JACK.
>
> I think, this was the way it was in 0.1 gstreamer.
>
> I've been able to find nothing discussing this for gstreamer 1 or for ubuntu
> 16.04.

Are you sure that wasn't using JACK via PulseAudio?  What are you
using GStreamer from?

AFAIK, settings in GStreamer for defining the ports that the
JackAudioSink connects to are new - you can set the port-pattern
property.

https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-good-plugins/html/gst-plugins-good-plugins-jackaudiosink.html

Best wishes,

Neil

From the JACK audio web page ( www.jackaudio.org/faq/gstreamer_via_jack.html ) :

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1. You need the GStreamer JACK audio plugin, which is currently (Fall 2009) part of the “bad” plugins collection. Most Linux distributions make this available through their normal software install/update systems. The name of the package containing this plugin will vary from distribution to distribution: on Fedora its called “gstreamer-plugins-bad-free-extra”, on Ubuntu its called “gst-plugins-bad”, etc. etc.

2. Next, you need to configure GStreamer to tell it to use this plugin for audio output. There are 3 methods available:
   • Through the command line using gconf2 (you may need to install this first)
   • Install/run gconf-editor, which is a general purpose utility for configuring many GNOME-centric applications.
   • Some systems may have the gstreamer-properties command available, which offers a graphical tool for configuring gstreamer.
3. Your goal is set the value of:
   • /system/gstreamer/0.10/audio/default/musicaudiosink
   • /system/gstreamer/0.10/audio/default/audiosink

to this value: jackaudiosink buffer-time=2000000. The exact value of buffer-time doesn’t matter too much, but higher values reduce the chance of glitches/drop-outs in the audio stream. You might also choose to set /system/gstreamer/0.10/audio/default/chataudiosink to the same value, but its less likely to be useful to you.

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It appears neither gconf nor /system/gstreamer/0.10/audio/default/ are resident in 16.04. (I'd guess the later path .../0.10/... would not be there since 16.04 is using gstreamer 1 not 0.10, correct?