[Bug 731038] New: playbin downmixes 5.0 multichannel-audio to stereo

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=731038
  GStreamer | gst-plugins | 1.2.4

           Summary: playbin downmixes 5.0 multichannel-audio to stereo
    Classification: Platform
           Product: GStreamer
           Version: 1.2.4
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: mueller at netcologne.de
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


when playbin gets the uri of a file containing audio with 5.0 channels
(FRONT_LEFT,FRONT_RIGHT,FRONT_CENTER,REAR_LEFT,REAR_RIGHT) it gives following
warning:

**(python3:13745): WARNING **: Unpositioned audio channel position flag set but
channel positions present
and plays the file downmixed to stereo.

5.1 gives the same warning but plays properly
same behaviour using gst-play-1.0

the above did not happend using gstreamer 0.1 components
gst123 played properly

the handmade pipeline below plays properly to
gst-launch-1.0 -v filesrc location=testchannels50.flac ! flacparse ! flacdec !
audioconvert ! audio/x-raw, channels=6 ! alsasink

please restore the behaviour of the 0.1 version, because 5.0 is the MOST common
case in classical-music media (LFE is mostly unwanted here) .
Nearly all comercial classical concertvideos and buyable audio-files have the
above channellayout.
So it would be convenient for users of playbin, that the warning may remain,
but the most common channel-layout for 5.0 is set as default in the same manner
as you do it for 5.1

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