[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):

 OK, when using the {{{fps}}} filter the duration is increased only by 1sec
 to 21secs. It passes through input frames [0, 13, 38, 63, ...] instead of
 [0, **1**, 13, 38, 63, ...] as it does when using {{{-r}}}.

 Have right now stumbled over the {{{framestep}}} filter and noticed that
 this filter keeps the duration and passes through input frames [0, 25, 50,
 75, ...]. See attached files for details.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3990#comment:2>
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