[FFmpeg-trac] #7662(avfilter:new): When using video filter fps, provide an option to retain actual pts, and pts_time for frames

[FFmpeg]

#7662: When using video filter fps, provide an option to retain actual pts, and
pts_time for frames
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             Reporter:  vishal733   |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:  fps         |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by vishal733):

 I understand your point now, and got the rationale behind fps filter
 changing the pts values.

 Btw, just to correct this statement:
 >  Preserving the PTS means preserving the initial frame rate.
 Not really. If you don't change the pts, it will just be a vfr(variable
 frame rate) output, at the desired output fps. Isn't it?
 Whereas, by changing pts values, we get a cfr(constant frame rate) at the
 desired output fps.

 I guess my request here could be better worded as "Ability to get vfr at
 desired fps from fps filter".

 Actually my usecase is, I want to allow frames to pass through at 2fps
 without altering their pts. And then apply more video filters on top of
 it.
 I guess -r option could have worked for me, if it was possible to apply
 filters after doing -r.

 I hope I am making sense?

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Ticket URL: <https://trac.ffmpeg.org/ticket/7662#comment:4>
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