[FFmpeg-trac] #3699(avfilter:new): Ability to use expressions using Drawtext to offset frame number without returning double

[FFmpeg]

#3699: Ability to use expressions using Drawtext to offset frame number without
returning double
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             Reporter:  synth        |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  drawtext     |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by cehoyos):

 Replying to [ticket:3699 synth]:
 > Currently the only way I've seen for offsetting the drawtext is to do:
 >
 > text='%{expr\:n+OFFSET}'
 >
 > where OFFSET is the number used for -start_frame. Unfortunately this
 won't work for us because the return value from expr is a double like
 1001.000000 and it doesn't seem there's a way to convert that to int or
 convert it to a value like %04d.

 Did you consider providing a command line (including complete, uncut
 console output) that allows to reproduce this?

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Ticket URL: <https://trac.ffmpeg.org/ticket/3699#comment:1>
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