[Bug 724509] playbin with appsink audio-sink doesn't handle caps well

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=724509
  GStreamer | gst-plugins-base | 1.2.2

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|HEAD                        |1.3.1

--- Comment #5 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2014-02-18 10:49:41 UTC ---
Thanks for the patch! Would be great if you could supply the patch in 'git
format-patch' format next time, that makes applying it easier for us.

I've also added a secondary sanity check/fix in audioconvert:

commit 6c6619a66922bac0c343c4a5623d5bdb322f0e92
Author: Tim-Philipp Müller <tim at centricular.com>
Date:   Tue Feb 18 10:42:04 2014 +0000

    audioconvert: never do mixing for 1->1 channel conversions

    MONO and NONE position are the same, for example, but in
    general there isn't much to do here for such a conversion.

    Fixes problem in audioconvert, which would end up using
    a mixmatrix when converting between different mono format
    because it thinks MONO positioning is different from
    unpositioned channels, which is not the case in this
    special case. The mixmatrix would end up being 0.0 so
    audioconvert would convert to silence samples.

    https://bugzilla.gnome.org/show_bug.cgi?id=724509

commit 5496d09eb42fa63d725f0a01ac6c7584126bc5da
Author: Rafał Mużyło <galtgendo at o2.pl>
Date:   Tue Feb 18 10:32:46 2014 +0000

    audio: map channels=1,channel-mask=0 to MONO instead of NONE

    Fixes problem in audioconvert, which would end up using
    a mixmatrix when converting between different mono format
    because it thinks MONO positioning is different from
    unpositioned channels, which is not the case in this
    special case. The mixmatrix would end up being 0.0 so
    audioconvert would convert to silence samples.

    https://bugzilla.gnome.org/show_bug.cgi?id=724509

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