[FFmpeg-trac] #5340(undetermined:new): ffmpeg with WMV input renders incorrect audio length (with some codecs)

FFmpeg trac at avcodec.org
Tue Mar 15 17:25:28 CET 2016


#5340: ffmpeg with WMV input renders incorrect audio length (with some codecs)
-------------------------------------+-------------------------------------
             Reporter:  veganaiZe    |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  wmv sync     |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:

 When converting a (20 FPS) WMV video to another video/container format
 with particular audio (output) codecs, including "-acodec copy", the
 resulting audio length is incorrect (It's supposed to be 9m:51s, but it's
 10m:18s).

 How to reproduce:
 Download the sample WMV video...
 {{{
 % ffmpeg -i <infile>.wmv -map 0:v -vcodec libx264 video.avi -map 0:a
 -acodec aac audio.aac
 }}}

 However, if I use ".m4a" as the extension, instead of ".aac" everything
 seems fine (when played with MPC-HC x64 v1.7.10)

 The following command also exhibits similar issues...
 {{{
 % ffmpeg -i <infile>.wmv -vcodec libx264 -acodec copy outfile.avi
 }}}

--
Ticket URL: <https://trac.ffmpeg.org/ticket/5340>
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