[FFmpeg-user] filter for changing frame rate

[Jon bae]

Am Mo., 13. Mai 2019 um 15:29 Uhr schrieb Carl Eugen Hoyos <
ceffmpeg at gmail.com>:

> Am Mo., 13. Mai 2019 um 15:05 Uhr schrieb Jon bae <jonbae77 at gmail.com>:
> >
> > Am Mo., 13. Mai 2019 um 14:34 Uhr schrieb Carl Eugen Hoyos <
> > ceffmpeg at gmail.com>:
> >
> > > Am Mo., 13. Mai 2019 um 14:31 Uhr schrieb Michael Koch
> > > <astroelectronic at t-online.de>:
> > >
> > > > > Or the fps filter.
> > > > > This filter and the r option have different algorithms that have
> > > > > advantages (and disadvantages) in different situations.
> > > >
> > > > Are the differences explained somewhere in the documentation?
> > >
> > > Not to my knowledge, them main difference is that the filter is
> > > more greedy.
> > >
> > > Carl Eugen
> > >
> > >
> > Sorry Carl Eugen - you are right. I did a test, and when I apply the fps
> > filter after setpts it not duplicate any frames.
>
> Sure?
>
> I mean: It may or may not duplicate frames but contrary to "-r"
> the console output will not tell you.
>
> As Moritz wrote: If your input is cfr, you only need setpts,
> fps is needed just in case an initial or final frame is missing.
> If your input is not cfr, setpts may or may not work
> correctly but you need fps (or -r) to create cfr video
> which the mp4 muxer expects.
>
> At least by my test file the fps filter has not duplicate frames, when I
add it after setpts. In my tests I have to use fps filter or the -r option,
when I don't use them I get no 25 fps in my output file.
I think we mostly deal with crf files.