[FFmpeg-trac] #523(swresample:new): Assertion "channel_count == channel_count(channel_layout)" fails

[FFmpeg]

#523: Assertion "channel_count == channel_count(channel_layout)" fails
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               Reporter:  cehoyos     |                  Owner:  michael
                   Type:  defect      |                 Status:  new
               Priority:  important   |              Component:  swresample
                Version:  git-master  |               Keywords:
             Blocked By:              |               Blocking:
Reproduced by developer:  0           |  Analyzed by developer:  0
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 Some AAC samples are detected as "2 channels (FC)", leading to an assert
 when converting to ac3.
 {{{
 $ ffmpeg -i out.loas out.ac3
 ffmpeg version N-33192-gfe70c1f, Copyright (c) 2000-2011 the FFmpeg
 developers
   built on Oct  1 2011 12:36:37 with gcc 4.3.2 [gcc-4_3-branch revision
 141291]
   configuration: --enable-libopenjpeg
   libavutil    51. 18. 0 / 51. 18. 0
   libavcodec   53. 19. 0 / 53. 19. 0
   libavformat  53. 13. 0 / 53. 13. 0
   libavdevice  53.  4. 0 / 53.  4. 0
   libavfilter   2. 43. 6 /  2. 43. 6
   libswscale    2.  1. 0 /  2.  1. 0
 [loas @ 0x8d3faa0] max_analyze_duration 5000000 reached at 5034667
 [loas @ 0x8d3faa0] Estimating duration from bitrate, this may be
 inaccurate
 Input #0, loas, from 'out.loas':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Audio: aac_latm, 48000 Hz, 2 channels (FC), s16
 Incompatible sample format 's16' for codec 'ac3', auto-selecting format
 'flt'
 [ac3 @ 0x8d46940] channel_layout not specified
 [ac3 @ 0x8d46940] No channel layout specified. The encoder will guess the
 layout, but it might be incorrect.
 Output #0, ac3, to 'out.ac3':
   Metadata:
     encoder         : Lavf53.13.0
     Stream #0:0: Audio: ac3, 48000 Hz, stereo, flt, 128 kb/s
 Stream mapping:
   Stream #0.0 -> #0.0 (aac_latm -> ac3)
 Press [q] to stop, [?] for help
 0.707107
 0.707107
 Assertion in ->ch_count == av_get_channel_layout_nb_channels(s->
 in_ch_layout) failed at libswresample/rematrix.c:231
 Aborted
 }}}

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Ticket URL: <http://www.avcodec.org/trac/ffmpeg/ticket/523>
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