[FFmpeg-trac] #5879(undetermined:new): Remove all metadata does not work with MKV files

[FFmpeg]

#5879: Remove all metadata does not work with MKV files
-------------------------------------+-------------------------------------
             Reporter:  Kdmeizk      |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug: Remove all metadata does not work with MKV files,
 '''DURATION''' metadata is still here.
 How to reproduce:
 {{{
 % ffmpeg -i input -map_metadata -1 ... output.mkv
 ffmpeg version N-81872-gbe1d324
 built gcc 5.4.0 (GCC) Windows 64 bits
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/5879>
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