[FFmpeg-trac] #4848(undetermined:new): Tagging of webm files is incomplete

[FFmpeg]

#4848: Tagging of webm files is incomplete
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             Reporter:  nexus07      |                     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:
 After conversion of an avi file published in the internet under CC-BY-NC-
 ND license into webm format (file: tr3d.webm), I tried to add the original
 avi tags from the video to the converted one. (This is necessary due to BY
 and ND restrictions of the license, the video is not edited anywhere, only
 converted to make it displayable as HTML5 video).

 But it seems not to work. The result file tr3d_tagged.webm does not show
 the media information. When I select tr3d_tagged.mkv as output file, it
 works. I used VP80 codec, which is allowed in webm container as subset of
 mkv codecs.

 How to reproduce:
 {{{
 % ffmpeg -i D:\tr3d.webm -c copy -metadata title="A roundtrip with the
 Transrapid TR09 maglev" -metadata license="CC-BY-NC-ND" -metadata
 description="Eine Fahrt im TR09" -metadata copyright="Michael Dittmer"
 -metadata genre="Documentation" -metadata date_released="2014" -metadata
 url="http://www.pro-transrapid.org" -metadata artist="GFM-eV" -metadata
 publisher="Pro-Transrapid" -metadata:s:v:0 stereo_mode="left_right"
 D:\tr3d_tagged.webm
 ffmpeg version N-74131-g9ec17e4
 built with gcc 4.9.2 (GCC)
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/4848>
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