[FFmpeg-user] slow motion by changing frame rate from 60 to 30

Michael Koch astroelectronic at t-online.de
Thu Oct 1 18:01:51 EEST 2020

Am 01.10.2020 um 16:57 schrieb Cristian Secară:
> I want to make a short .mp4 clip filmed in 1080p/60 format, then change somehow the playing fame rate to 30Hz so that the playing speed becomes twice slower. Audio is not important (may be dropped completely).
> As far as I know (?), a "simple" frame rate change will try to preserve the playing speed, so when changing from 60Hz to 30Hz, it will drop half of the movie.
> At the same time, a "simple" slow motion processing will try to keep the original frame rate, so in this case it will interpolate the transitions or something, while keeping the frame rate still at 60Hz.
> What options are available for preserving all frames "as is" and just slowing down the playing speed ?

It's described here:


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