[FFmpeg-trac] #3990(ffmpeg:new): Video duration increases when reducing frame rate

[FFmpeg]

#3990: Video duration increases when reducing frame rate
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             Reporter:  t.rapp      |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  ffmpeg
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by t.rapp):

 After some more trial-and-error testing I think I understand the "round"
 argument of {{{fps}}} a bit better. {{{fps=fps=1:round=zero}}} seems to do
 the same as {{{framestep=25}}} for PAL but should also work for NTSC.

 So the main problem is solved for me. Maybe the documentation of the
 "round" argument could be updated with some details/examples about which
 frame numbers are passed through.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3990#comment:3>
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