[FFmpeg-trac] #10017(documentation:new): Filter expression syntax is undocumented

[FFmpeg]

#10017: Filter expression syntax is undocumented
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             Reporter:  jason        |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  minor        |                Component:
                                     |  documentation
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Cigaes):

 https://ffmpeg.org/ffmpeg-all.html#Expression-Evaluation

 I grant you FFmpeg's documentation is lacking in the department of
 internal links, but you cannot say that expressions are not documented.
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Ticket URL: <https://trac.ffmpeg.org/ticket/10017#comment:2>
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