[FFmpeg-trac] #3253(avfilter:new): drawtext filter: problems with text expansions

[FFmpeg]

#3253: drawtext filter: problems with text expansions
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             Reporter:  Krieger      |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  0            |
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Changes (by beastd):

 * reproduced:  0 => 1


Comment:

 Replying to [comment:3 Krieger]:
 > Replying to [comment:2 Cigaes]:
 > > You probably need to escape the {{{:}}} used in the expansion, to
 prevent it from delimiting options. Not getting an error is strange
 though.
 >
 > text=%{expr\:t} works same way and prints "t}".

 I cannot exactly explain how all this works together, but it seems that
 you need to deal with another layer of escaping or in other words add
 another \ . Then it works as expected here.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3253#comment:4>
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