[Bug 784872] New: Audio does fails to upmix mono channel to stereo

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784872

            Bug ID: 784872
           Summary: Audio does fails to upmix mono channel to stereo
    Classification: Platform
           Product: GStreamer
           Version: 1.12.1
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: jacob.adamson at k3integrations.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

When completing one of the tutorials for gstreamer, [Basic Tutorial
8](https://gstreamer.freedesktop.org/documentation/tutorials/basic/short-cutting-the-pipeline.html),
the pipeline failed to play content with a not-negotiated message.

After a bit of debugging, it turns out the reason was because the appsrc was
being configured as a single channel source, and the audiosink only supported 2
channel playback. Changing the caps on the appsrc to 2 channels worked around
the problem, but I would have expected the single channel source to be upmixed
to 2 channels.

[log](https://pastebin.com/mAHtLsQh)

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