[FFmpeg-trac] #5457(undetermined:new): mp3 delay issue

[FFmpeg]

#5457: mp3 delay issue
-------------------------------------+-------------------------------------
             Reporter:  rhbc73       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 This issue is reproduced with
 {{{
 ffmpeg version N-79546-g13406b6 Copyright (c) 2000-2016 the FFmpeg
 developers
 }}}

 Description:
 Run below commands to generate a.wav and b.wav
 {{{
 ffmpeg.exe -i big50.mp4 -acodec libmp3lame a.mp3
 ffmpeg.exe -i a.mp3 a.wav
 }}}


 {{{
 ffmpeg.exe -i big50.mp4 -vcodec libx264 -acodec libmp3lame b.avi
 ffmpeg.exe -i b.avi b.wav
 }}}

 Open a.wav and b.wav in wav file editor you can see there's 50 ms delay in
 b.wav. (sample rate is 22050, so that 50 ms should be delay introduced by
 LAME that are don't properly handled by ffmpeg?)

 Source mp4 is here: https://dl.dropboxusercontent.com/u/89678527/big50.mp4
 and generated wav files:
 https://dl.dropboxusercontent.com/u/89678527/a.wav
 https://dl.dropboxusercontent.com/u/89678527/b.wav

 here's comparison of a.wav and b.wav
 [https://dl.dropboxusercontent.com/u/89678527/mp3.PNG]

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5457>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker