[FFmpeg-user] Change fps from 50 to 25

[Reindl Harald]

Am 12.11.22 um 13:57 schrieb Cecil Westerhof via ffmpeg-user:
> Michael Koch <astroelectronic at t-online.de> writes:
> 
>> Am 12.11.2022 um 12:39 schrieb Cecil Westerhof via ffmpeg-user:
>>> I have a few videos that have a 50 fps. But the computer I am playing
>>> them on cannot handle that properly. Can I use ffmpeg to change the
>>> fps to 25? While still having the same length.
>>>
>>
>> sure, that's easy:
>> ffmpeg -i in.mp4 -r 25 out.mp4
> 
> That really is easy. :-D
> 
> I should add a '-preset veryfast'. That makes it go about three times
> as fast (on my system).
> 
> But that still takes a lot of time. Maybe I ask something stupid, but
> would it be possible to drop every other frame and copy the rest?

speed versus quality