[FFmpeg-trac] #2325(undetermined:new): MP4 AAC Audio is delayed by 2ms when converted to PCM

[FFmpeg]

#2325: MP4 AAC Audio is delayed by 2ms when converted to PCM
-------------------------------------+-------------------------------------
             Reporter:  brchapman    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  aac mov      |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by brchapman):

 The command doesn't fail, but here's the output
 {{{
 % ffmpeg -i test100.mp4 -c:a pcm_s16le test100_audio.wav
 ffmpeg version 1.1.git Copyright (c) 2000-2013 the FFmpeg developers
 built on Mar  4 2013 11:40:27 with Apple clang version 4.1
 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
   configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD --enable-shared
 --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree
 --enable-hardcoded-tables --enable-avresample --cc=cc --host-cflags=
 --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame
 --enable-libxvid --enable-libfreetype --enable-ffplay
   libavutil      52. 17.103 / 52. 17.103
   libavcodec     54. 92.100 / 54. 92.100
   libavformat    54. 63.102 / 54. 63.102
   libavdevice    54.  3.103 / 54.  3.103
   libavfilter     3. 41.100 /  3. 41.100
   libswscale      2.  2.100 /  2.  2.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  2.100 / 52.  2.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test100.mp4':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: mp42mp41
     creation_time   : 2013-03-04 21:40:01
   Duration: 00:00:12.50, start: 0.000000, bitrate: 283 kb/s
     Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p,
 1280x720 [SAR 1:1 DAR 16:9], 85 kb/s, 24 fps, 24 tbr, 24k tbn, 48 tbc
     Metadata:
       creation_time   : 2013-03-04 21:40:01
       handler_name    : Mainconcept MP4 Video Media Handler
     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo,
 fltp, 189 kb/s
     Metadata:
       creation_time   : 2013-03-04 21:40:01
       handler_name    : Mainconcept MP4 Sound Media Handler
 File 'test100_audio.wav' already exists. Overwrite ? [y/N] y
 Output #0, wav, to 'test100_audio.wav':
   Metadata:
     major_brand     : mp42
     minor_version   : 0
     compatible_brands: mp42mp41
     ISFT            : Lavf54.63.102
     Stream #0:0(eng): Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz,
 stereo, s16, 1536 kb/s
     Metadata:
       creation_time   : 2013-03-04 21:40:01
       handler_name    : Mainconcept MP4 Sound Media Handler
 Stream mapping:
   Stream #0:1 -> #0:0 (aac -> pcm_s16le)
 Press [q] to stop, [?] for help
 size=    2344kB time=00:00:12.50 bitrate=1536.1kbits/s
 video:0kB audio:2344kB subtitle:0 global headers:0kB muxing overhead
 0.003333%
 }}}

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2325#comment:3>
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