[FFmpeg-trac] #10156(avfilter:new): The "framerate" video filter badworking with duplicates frames in slideshow

[FFmpeg]

#10156: The "framerate" video filter badworking with duplicates frames in slideshow
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             Reporter:  Alex         |                     Type:  defect
  Natalsson                          |
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:
                                     |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 I am making a slideshow.
 I connecting the photos to video with:
 $ffmpeg -r 1 -pattern_type glob -i '/tmp/temp/*.jpg' 1047.JPG_slide.mp4

 For smoothing change photos I try to use video filter "framerate":
 $ffmpeg -threads 1 -i 1047.JPG_slide.mp4 -vf framerate='fps=30'
 1047.JPG_slide_framerate.mp4

 And this working almost fine.
 But when I creates for increasing duration duplicate photos the smoothing
 translation don't working and appears sometimes only.
 $ffmpeg -r 1 -pattern_type glob -i '/tmp/temp/*.jpg'
 1047.JPG_with_duplicates_slide.mp4
 $ffmpeg -threads 1 -i 1047.JPG_with_duplicates_slide.mp4 -vf
 framerate='fps=30'  1047.JPG_with_duplicates_slide_framerate.mp4

 May be this is a bug?
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Ticket URL: <https://trac.ffmpeg.org/ticket/10156>
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