[FFmpeg-trac] #1949(avfilter:closed): Display frame number on each frame

[FFmpeg]

#1949: Display frame number on each frame
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             Reporter:  igorg        |                    Owner:
                 Type:  enhancement  |                   Status:  closed
             Priority:  wish         |                Component:  avfilter
              Version:  git-master   |               Resolution:  fixed
             Keywords:  drawtext     |               Blocked By:
             Blocking:               |  Reproduced by developer:  1
Analyzed by developer:  1            |
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Comment (by Charlie):

 also, is it possible to use a variable in this expansion function ?
 I need to display a frame number with an integer offset I calculate
 before:
 {{{
 text=%{expr\\\\\:n-' + offset + '}
 'text=%{expr\\\\\:n-%d}' % offset
 }}}
 Both lines above display the plain expression 'n-offset', but don't
 calculate it.
 Thanks in advance

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1949#comment:17>
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