Public bug reported:

Binary package hint: faad

faad does not decode the audio codec config corrctly for aac files. The
number of channels is in the 2nd byte shifted right by 3 positions.

[EMAIL PROTECTED]:~/audio$ GST_DEBUG="*:2,faad*:4" gst-play 2>&1 audio_mono.mp4 
| grep codec
0:00:00.267836103 11965  0x8214f28 DEBUG                 faad 
gstfaad.c:320:gst_faad_setcaps: codec_data: 0x12 0x8
0:00:00.267994513 11965  0x8214f28 INFO                  faad 
gstfaad.c:328:gst_faad_setcaps:<faad0> codec_data init: channels=2, rate=44100

[EMAIL PROTECTED]:~/audio$ GST_DEBUG="*:2,faad*:4" gst-play 2>&1 
audio_stereo.mp4 | grep codec
0:00:00.148715154 11979  0x8213b88 DEBUG                 faad 
gstfaad.c:320:gst_faad_setcaps: codec_data: 0x12 0x10
0:00:00.148873563 11979  0x8213b88 INFO                  faad 
gstfaad.c:328:gst_faad_setcaps:<faad0> codec_data init: channels=2, rate=44100

** Affects: faad2 (Ubuntu)
     Importance: Undecided
         Status: New

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faad_2.6.1-2_i386.deb does not handle mono audio
https://bugs.launchpad.net/bugs/290259
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