[FFmpeg-trac] #5035(undetermined:new): fps filter does not duplicate input frame #0

[FFmpeg]

#5035: fps filter does not duplicate input frame #0
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             Reporter:               |                     Type:  defect
  ryanwilliams                       |                 Priority:  normal
               Status:  new          |                  Version:
            Component:               |  unspecified
  undetermined                       |               Blocked By:
             Keywords:               |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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 Summary of the bug:
 fps filter only outputs desired the frame rate after the second input
 frame is encountered. In the following example the output video does not
 achieve the desired frame rate until 00:05.

 ffmpeg -threads 0 -y -i Slideshow.MOV -filter_complex "[0:v] fps='fps=25',
 drawtext='fontfile=calibri.ttf:fontsize=32:text=%{n}:x=20:y=20:fontcolor=white:box=1:boxcolor=0x00000099'"
 -an -r 25 Slideshow.mp4

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Ticket URL: <https://trac.ffmpeg.org/ticket/5035>
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