[FFmpeg-trac] #3776(undetermined:open): Decoding bug when playing some MPEG-4 ALS streams

[FFmpeg]

#3776: Decoding bug when playing some MPEG-4 ALS streams
-------------------------------------+-------------------------------------
             Reporter:  olderz       |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  als          |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  1
-------------------------------------+-------------------------------------
Changes (by cehoyos):

 * keywords:   => als
 * status:  new => open
 * component:  ffplay => undetermined
 * reproduced:  0 => 1


Comment:

 Samples uploaded to http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket3776/
 For future tickets: Please read https://ffmpeg.org/bugreports.html
 (neither 7z nor mediafire are appreciated) and please always provide
 command line and console output.
 {{{
 $ ffplay Starbeam\ Antarctica.mp4 -autoexit
 ffplay version N-64723-g88f038a Copyright (c) 2003-2014 the FFmpeg
 developers
   built on Jul 17 2014 16:04:34 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 92.101 / 52. 92.101
   libavcodec     55. 69.100 / 55. 69.100
   libavformat    55. 48.101 / 55. 48.101
   libavdevice    55. 13.102 / 55. 13.102
   libavfilter     4. 11.102 /  4. 11.102
   libswscale      2.  6.100 /  2.  6.100
   libswresample   0. 19.100 /  0. 19.100
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Starbeam Antarctica.mp4':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: mp42isom
     creation_time   : 2014-07-17 08:16:13
   Duration: 00:03:53.91, start: 0.000000, bitrate: 1121 kb/s
     Stream #0:0(und): Audio: mp4als (mp4a / 0x6134706D), 44100 Hz, 2
 channels, s16, 1121 kb/s (default)
     Metadata:
       creation_time   : 2014-07-17 08:16:13
 [als @ 0x7f9384001fa0] Damaged channel data.  0KB sq=    0B f=0/0
 [als @ 0x7f9384001fa0] Reading frame data failed. Skipping RA unit.
  234.03 M-A:  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0
 }}}
 {{{
 $ ffmpeg -i Starbeam\ Antarctica.mp4 out.wav
 ffmpeg version N-64723-g88f038a Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Jul 17 2014 16:04:34 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 92.101 / 52. 92.101
   libavcodec     55. 69.100 / 55. 69.100
   libavformat    55. 48.101 / 55. 48.101
   libavdevice    55. 13.102 / 55. 13.102
   libavfilter     4. 11.102 /  4. 11.102
   libswscale      2.  6.100 /  2.  6.100
   libswresample   0. 19.100 /  0. 19.100
   libpostproc    52.  3.100 / 52.  3.100
 Guessed Channel Layout for  Input Stream #0.0 : stereo
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Starbeam Antarctica.mp4':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: mp42isom
     creation_time   : 2014-07-17 08:16:13
   Duration: 00:03:53.91, start: 0.000000, bitrate: 1121 kb/s
     Stream #0:0(und): Audio: mp4als (mp4a / 0x6134706D), 44100 Hz, 2
 channels, s16, 1121 kb/s (default)
     Metadata:
       creation_time   : 2014-07-17 08:16:13
 Output #0, wav, to 'out.wav':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: mp42isom
     ISFT            : Lavf55.48.101
     Stream #0:0(und): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz,
 stereo, s16, 1411 kb/s (default)
     Metadata:
       creation_time   : 2014-07-17 08:16:13
       encoder         : Lavc55.69.100 pcm_s16le
 Stream mapping:
   Stream #0:0 -> #0:0 (mp4als (als) -> pcm_s16le (native))
 Press [q] to stop, [?] for help
 size=   40294kB time=00:03:53.90 bitrate=1411.2kbits/s
 video:0kB audio:40294kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: 0.000189%
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/3776#comment:4>
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