[FFmpeg-user] timelapse framerates

[Carl Eugen Hoyos]

Michael Koch <astroelectronic <at> t-online.de> writes:

> ffmpeg -framerate 25 -start_number 123 -i IMG_%4d.jpg 
> -codec:v mpeg4 output.mp4

Please understand that you are expected to always 
post your command line including the complete, 
uncut console output on this mailing list.

> 1. Is it possible to make a video with different input 
> and output framerates? 

> For example, using each input picture twice? I mean 
> without duplicating and renaming the the input pictures.

The concat muxer should allow this.

> 2. Is that also possible for arbitrary input and output 
> framerates? (i.e. output framerate is not an even 
> multiple of input framerate) ?

I may misunderstand but this sounds like a combination 
of 1. and 3. to me.

> 3. Is it also possible to make the output framerate 
> bigger than the input framerate, which means some of 
> the input pictures are skipped?

Of course, just specify the frame rate you want.
(Why not?)

Carl Eugen