[FFmpeg-trac] #10763(documentation:new): Improve documentation for random() expression

[FFmpeg]

#10763: Improve documentation for random() expression
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             Reporter:  Michael      |                     Type:
  Koch                               |  enhancement
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  documentation                      |  master
             Keywords:  seed         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Please add this to the documentation of the random() expression:

 random(0) uses the variable 0 as a seed value. The memory of variable 0 is
 a union of int and double. When used by the expressions ld() and st(),
 it's double. When used by random(), then it's int. Important thing to
 remember: If you want to set the random generator to a seed value much
 different from 0, then you have to use rather big numbers, for example
 st(0, 2^41).
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Ticket URL: <https://trac.ffmpeg.org/ticket/10763>
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