[FFmpeg-trac] #7916(ffmpeg:new): Incorrect seeking for modplug formats

[FFmpeg]

#7916: Incorrect seeking for modplug formats
-------------------------------------+-------------------------------------
             Reporter:  _abjd_       |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  ffmpeg       |                  Version:  git-
             Keywords:  modplug,     |  master
  seeking                            |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 ffmpeg -ss 00:01:25.00 -i BUTTERFL.XM render.mp3
 }}}

 Output:
 {{{
 Input #0, libopenmpt, from 'BUTTERFL.XM':
   Metadata:
     title           : Butterfly Flew Away
     encoder         : FastTracker 2 or compatible
   Duration: 00:02:53.19, bitrate: 15 kb/s
     Stream #0:0: Audio: pcm_f32le, 48000 Hz, stereo, flt, 3072 kb/s

 Stream mapping:
   Stream #0:0 -> #0:0 (pcm_f32le (native) -> mp3 (libmp3lame))

 Press [q] to stop, [?] for help
 Output #0, mp3, to 'render.mp3':
   Metadata:
     TIT2            : Butterfly Flew Away
     TSSE            : Lavf58.26.101
     Stream #0:0: Audio: mp3 (libmp3lame), 48000 Hz, stereo, fltp
     Metadata:
       encoder         : Lavc58.47.102 libmp3lame
 size=      55kB time=00:00:03.40 bitrate= 131.5kbits/s speed=7.29x
 }}}

 Seeking to 1:25 in a 2:53 length file results in a 3.4 second output. This
 has happened with every modplug format I've tried so far.

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7916>
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