[FFmpeg-trac] #1694(avcodec:open): Decoding a possibly damaged aac sample fails from a specific position on

[FFmpeg]

#1694: Decoding a possibly damaged aac sample fails from a specific position on
-------------------------------------+-------------------------------------
             Reporter:  cehoyos      |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  important    |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  aac          |               Blocked By:
  regression                         |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 A user reported a problem with the aac decoder that is also a regression
 since 1232723 / 9fb7e14:
 http://thread.gmane.org/gmane.comp.video.ffmpeg.libav.user/9641
 Sample attached.
 {{{
 $ ffmpeg -i only_decode_3rd_channel_large.aac out.wav
 ffmpeg version N-48693-g452f632 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jan 10 2013 12:00:56 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl --disable-indev=jack
   libavutil      52. 13.100 / 52. 13.100
   libavcodec     54. 86.100 / 54. 86.100
   libavformat    54. 59.107 / 54. 59.107
   libavdevice    54.  3.102 / 54.  3.102
   libavfilter     3. 32.100 /  3. 32.100
   libswscale      2.  1.103 /  2.  1.103
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
 [aac_latm @ 0x2781780] initializing latmctx
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 [loas @ 0x277b3c0] max_analyze_duration 5000000 reached at 5034667
 [loas @ 0x277b3c0] Estimating duration from bitrate, this may be
 inaccurate
 Input #0, loas, from 'only_decode_3rd_channel_large.aac':
   Duration: N/A, bitrate: N/A
     Stream #0:0: Audio: aac_latm, 48000 Hz, 5.1, fltp
 Output #0, wav, to 'out.wav':
   Metadata:
     ISFT            : Lavf54.59.107
     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, 5.1,
 s16, 4608 kb/s
 Stream mapping:
   Stream #0:0 -> #0:0 (aac_latm -> pcm_s16le)
 Press [q] to stop, [?] for help
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 [aac_latm @ 0x2781780] channel element 0.2 is not allocated
 Error while decoding stream #0:0: Operation not permitted
 Error while decoding stream #0:0: Invalid data found when processing input
 size=    9072kB time=00:00:17.57 bitrate=4227.8kbits/s
 video:0kB audio:9072kB subtitle:0 global headers:0kB muxing overhead
 0.001098%
 }}}
 out.wav starts as a 5.1 file with audio on several channels, after a
 second, only the center channel is not silent, also reproducible with
 ffplay -showmode 1

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1694#comment:4>
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