[FFmpeg-trac] #11096(undetermined:new): Chaotic escaping rules

[FFmpeg]

#11096: Chaotic escaping rules
-------------------------------------+-------------------------------------
             Reporter:  ManDay       |                     Type:
                                     |  enhancement
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
  filter_complex expression          |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Consider a filter which draws the text "early", if the time is less than
 5.0 seconds and "late", otherwise. The only reasonable syntax for a
 filter-chain to achieve this, with using only a single type of quotes,
 would be the following:
 {{{
 drawtext=text='%{e:if(lt(t,5),\'early\',\'late\'}'
 }}}
 At the different levels of parsing, we have

 ...the filter complex: `drawtext=text='...'`
 ...the `text` argument: `%{...}`
 ...the expansion: `e:....`
 ...the `expr` parser: `if(lt(t,5),'early','late')`

 Where the ellipses `...` are syntactically opaque to the respective
 receiver by their notion of quotes/scoping. There is logically no need for
 further escaping. In the current state of affairs, the above does not work
 and requires complicated and lengthy escaping to the point where I could
 not even figure out a working combination.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11096>
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