[FFmpeg-trac] #4836(documentation:new): doc/filters: fix localtime drawtext example.

[FFmpeg]

#4836: doc/filters: fix localtime drawtext example.
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             Reporter:  Nikita       |                     Type:  defect
               Status:  new          |                 Priority:  minor
            Component:               |                  Version:
  documentation                      |  unspecified
             Keywords:               |               Blocked By:
  documentation                      |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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 Need to fix drawtext text expansion example in documentation:
 http://ffmpeg.org/ffmpeg-filters.html#Examples-37
 From:
 drawtext='fontfile=FreeSans.ttf:text=%{localtime\:%a %b %d %Y}'
 To:
 drawtext='fontfile=FreeSans.ttf:text=%{localtime\\:%a %b %d %Y}'
 Description of why to use the double backslash:
 https://trac.ffmpeg.org/ticket/3253
 Related old fix:
 https://ffmpeg.org/pipermail/ffmpeg-devel/2014-September/162729.html

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Ticket URL: <https://trac.ffmpeg.org/ticket/4836>
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