[FFmpeg-trac] #5016(ffmpeg:new): generating thumbs, repeating frames not working correctly for last frame

[FFmpeg]

#5016: generating thumbs, repeating frames not working correctly for last frame
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             Reporter:  sannies  |                     Type:  defect
               Status:  new      |                 Priority:  normal
            Component:  ffmpeg   |                  Version:  git-master
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
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 Summary of the bug:
 How to reproduce:
 The input is a low framerate 6 frame video displaying 1,2,3,4,5,6 each for
 600ms with 3.6s in total

 {{{
 ffmpeg -v 9 -loglevel 99 -y -i 1to6.mp4 -filter_complex fps=fps=50/3.6
 out%d.jpg -report
 }}}
 report is attached as 'onefileperframe.txt'
 The output are 15 images with '1', 9 with '2', 8 with '3', 8 with '4', 9
 with '5' and 1 with '6'.
 I would have expected all frames repeated 8 to 9 times!

 The behavior changes when using the tile filter:

 {{{
 ffmpeg -v 9 -loglevel 99 -y -i 1to6.mp4 -filter_complex
 fps=fps=50/3.6,tile=50x1 out%d.jpg -report
 }}}
 report is attached as 'withtilefilter.log'
 The single output jpg shows only 43 frames. 8 times '1', 9 times '2', 8
 times '3', 8 times '4', 9 times '5', and 1 time '6'.

 Both variants don't fully work for me here. The first one at least outputs
 50 frames but overemphasizes the first frame. The second command doesn't
 repeat the last frame and doesn't output 50 frames.

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Ticket URL: <https://trac.ffmpeg.org/ticket/5016>
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