[gstreamer-bugs] [Bug 564019] New: Downmixing 5.1 -> stereo does not anymore include LFE channel information

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | don't know | Ver: 0.10.21
           Summary: Downmixing 5.1 -> stereo does not anymore include LFE
                    channel information
           Product: GStreamer
           Version: 0.10.21
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: don't know
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: timo.jyrinki at hut.fi
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


As per http://lwn.net/Articles/310346/, filing a bug about a regression I have
noticed, ie. that GStreamer does not anymore (at least automatically) include
LFE channel when downmixing from 5.1.

Easiest way to see this to fetch a file called Test AC3 v2.0.avi from Internet
(unfortunately probably non-free file as such), ie.
http://www.google.com/search?q="test+ac3+v2.0"

Try it out, and observe that during LFE playback you don't here anything using
stereo output. For that matter, those of you with true 5.1 equipments would
probably want to test it out anyway - with a quick test I was seemingly not
really able to get the LFE information to my amplifier even in multi-channel
output when using totem-gstreamer (5.1 setting, and there is another bug with
totem filed that the pass-through cannot be selected when using gstreamer
backend).

Using GStreamer packages from ubuntu's development version (9.04). I think it
worked during 8.04 LTS times (gstreamer 0.10.18), and at least during 7.10
(gstreamer 0.10.14).

I'm not really sure if this problem is in the AC3 decoder or somewhere higher
in the channel mapping code.

If anyone has information about a similar libre test clip that could be
included in the test suite, please tell.


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