[gstreamer-bugs] [Bug 632691] New: [ffenc_ac3] does not support changing the number of channels on the fly

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=632691
  GStreamer | gst-ffmpeg | git

           Summary: [ffenc_ac3] does not support changing the number of
                    channels on the fly
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-ffmpeg
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: julien.isorce at gmail.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Created an attachment (id=172842)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=172842)
aac file that contains 2 audio channels then 6 then 2 then 6 (recorded with
faac outputformat=1)

** steps to reproduce:

gst-launch-0.10 filesrc location=res.aac ! aacparse ! faad ! ffenc_ac3 !
filesink location=res.ac3

** Actual result:

Lot of errors when switching to 6 audio channels:

0:00:09.248382223 20569  0x8725130 ERROR                 ffmpeg
gstffmpegcodecmap.c:122:gst_ff_channel_layout_to_gst: Number of channels is
different (2 != 6)
0:00:09.250532238 20569  0x8725130 ERROR                 ffmpeg :0:: Bit
allocation failed. Try increasing the bitrate.

But the recording pipeline does not stop.

Playing it with:

gst-launch-0.10 -v filesrc location=res.ac3 ! ac3parse ! a52dec ! audioconvert
! alsasink

You can hear the beginning of res.ac3 but you cannot hear when switching to 6
audio channels. 
But at least it seems to be detected (when switching from 2 to 6 channels:
ac3parse0.GstPad:src: caps = audio/x-ac3, framed=(boolean)true,
rate=(int)48000, channels=(int)6)

** Expected result:

You should be able to hear the whole audio stream from res.ac3

** Other infos:

- You can hear with aacparse: gst-launch-0.10 filesrc location=res.aac !
aacparse ! faad ! alsasink

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