[FFmpeg-trac] #3537(undetermined:new): Wrong duration of some WMV to MP4 file or wrong meta data with ffmpeg 2.1 and 2.2, but ok with 1.2 and old

[FFmpeg]

#3537: Wrong duration of some WMV to MP4 file or wrong meta data with ffmpeg 2.1
and 2.2, but ok with 1.2 and old
-------------------------------------+-------------------------------------
             Reporter:  vikigns      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  important    |                Component:
              Version:  unspecified  |  undetermined
             Keywords:               |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------

Comment (by cehoyos):

 I tested the following command line:
 {{{
 $ ffmpeg -ss 10 -i 1280.wmv -vcodec mpeg4 -strict -2 -acodec aac -t 29
 -qscale 2 -s 640:360 out.mp4
 }}}
 FFmpeg, MPlayer and vlc all report the length of the output file as 29
 seconds. How can I reproduce the problem?
 {{{
 $ ffmpeg -i out.mp4
 ffmpeg version N-62246-g02497a5 Copyright (c) 2000-2014 the FFmpeg
 developers
   built on Apr  7 2014 12:19:24 with gcc 4.7 (SUSE Linux)
   configuration: --enable-gpl
   libavutil      52. 74.100 / 52. 74.100
   libavcodec     55. 58.102 / 55. 58.102
   libavformat    55. 36.102 / 55. 36.102
   libavdevice    55. 11.100 / 55. 11.100
   libavfilter     4.  3.100 /  4.  3.100
   libswscale      2.  6.100 /  2.  6.100
   libswresample   0. 18.100 /  0. 18.100
   libpostproc    52.  3.100 / 52.  3.100
 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
   Metadata:
     major_brand     : isom
     minor_version   : 512
     compatible_brands: isomiso2mp41
     encoder         : Lavf55.36.102
   Duration: 00:00:29.02, start: 0.023220, bitrate: 2954 kb/s
     Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D),
 yuv420p, 640x360 [SAR 1:1 DAR 16:9], 2821 kb/s, 30 fps, 30 tbr, 15360 tbn,
 30 tbc (default)
     Metadata:
       handler_name    : VideoHandler
     Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo,
 fltp, 128 kb/s (default)
     Metadata:
       handler_name    : SoundHandler
 At least one output file must be specified
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/3537#comment:10>
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