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

FFmpeg trac at avcodec.org
Tue Mar 5 03:07:14 CET 2013


#2325: MP4 AAC Audio is delayed by 2ms when converted to PCM
-------------------------------------+-------------------------------------
             Reporter:  brchapman    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  aac, mp4,    |               Blocked By:
  pcm                                |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 When using ffmpeg to convert an aac audio stream from an mp4 to pcm, the
 result is out of sync by about 2ms.  By adding -ss 00:00:00.02 after the
 input, then output is correctly aligned.

 How to reproduce:
 {{{
 % ffmpeg -i test100.mp4 -c:a pcm_s16le test100_audio.wav
 ffmpeg version 1.1.git
 git revision: faa0068
 built on Mar  4 2013 11:40:27
 }}}

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