[FFmpeg-trac] #6557(undetermined:new): -metadata artist="string", (and title=) are repeated in .WMA files

[FFmpeg]

#6557: -metadata artist="string", (and title=) are repeated in .WMA files
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             Reporter:  PaulJayD     |                     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:
 Ffmpeg .WMA -metadata artist and title string repeats

 For .wma files the "artist" and "title" fields have the string repeated
 with some characters in between.

 I say "some characters", because in MP3Tag they display as "\\", but in
 FooBar2000 they display as both ", " and "; " depending on the view.

 So, for example, [-metadata title="abc"] appears as [abc, abc]

 How to reproduce:

 ffmpeg -i "validMetadata.wma" -metadata author="abc" -y "badMetadata.wma"

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Ticket URL: <https://trac.ffmpeg.org/ticket/6557>
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