[FFmpeg-user] generating a video from slides, sound and transition times

[Carl Eugen Hoyos]

Pablo Rodríguez <oinos <at> web.de> writes:

> I want the generated video with a variable frame rate (I think 
> a fixed frame rate makes no sense in this case).
> 
> How can I do this with output video in Matroska, VP8/9 and Opus?

I am not sure I understand:
If you have a vfr video as input, ffmpeg should be able to 
produce a vfr video as output (at least under some constraints) 
but there is no option "use the following timestamps for static 
images".
Your question implies that you believe your use case would lead 
to larger files with cfr, I don't think this is always the case, 
at least the savings would not be as big as you may expect.

Carl Eugen