[libav-bugs] [Bug 294] New: HE-AAC v2 illegally signalled as chan_config 2 fails to play PS layer

bugzilla-daemon at aruru.libav.org bugzilla-daemon at aruru.libav.org
Tue May 22 23:03:20 CEST 2012


http://bugzilla.libav.org/show_bug.cgi?id=294

           Summary: HE-AAC v2 illegally signalled as chan_config 2 fails
                    to play PS layer
           Product: Libav
           Version: git HEAD
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: libavcodec
        AssignedTo: bugzilla at libav.org
        ReportedBy: alex.converse at gmail.com


Created attachment 318
  --> http://bugzilla.libav.org/attachment.cgi?id=318
Nero HE-AAC v2 with chan_config = 2

$ avconv -i  ~/Downloads/Nero\ 032\ kbps\ CBR-HE.mp4 out.wav
avconv version v0.8-1650-gfa8fc3b, Copyright (c) 2000-2012 the Libav developers
  built on May  7 2012 11:41:38 with gcc 4.6.3
[aac @ 0x15b12a0] Parametric Stereo signaled to be not-present but was found in
the bitstream.
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x15ae760] Could not find codec parameters (Data:
mp4s / 0x7334706D, 0 kb/s)
    Last message repeated 1 times
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'/usr/local/google/home/aconverse/Downloads/Nero 032 kbps CBR-HE.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isom
    creation_time   : 2006-03-23 15:10:30
    artist          : WAV
    encoder         : Nero AAC Codec 4.2.4.8
  Duration: 00:00:24.44, start: 0.000000, bitrate: 33 kb/s
    Stream #0.0(eng): Audio: aac, 44100 Hz, mono, s16, 32 kb/s
    Metadata:
      creation_time   : 2006-03-23 15:10:30
    Stream #0.1(eng): Data: mp4s / 0x7334706D, 0 kb/s
    Metadata:
      creation_time   : 2006-03-23 15:10:31
    Stream #0.2(eng): Data: mp4s / 0x7334706D, 0 kb/s
    Metadata:
      creation_time   : 2006-03-23 15:10:31
Output #0, wav, to 'out.wav':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isom
    creation_time   : 2006-03-23 15:10:30
    artist          : WAV
    encoder         : Lavf54.3.0
    Stream #0.0(eng): Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
    Metadata:
      creation_time   : 2006-03-23 15:10:30
Stream mapping:
  Stream #0:0 -> #0:0 (aac -> pcm_s16le)
Press ctrl-c to stop encoding
[aac @ 0x15b12a0] Parametric Stereo signaled to be not-present but was found in
the bitstream.
    Last message repeated 524 times
size=    2100kB time=24.38 bitrate= 705.6kbits/s    
video:0kB audio:2100kB global headers:0kB muxing overhead 0.002139%


With debug:

[aac @ 0x2e6c2a0] extradata size 5
[aac @ 0x2e6c2a0] 13 90 56 e5 a0 
chan_config 2

This should be an easy fix with the new mono/stereo workarounds.

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