[FFmpeg-user] Manually specifying output codec timebase (to match existing output)

[Carl Eugen Hoyos]

Rob Hallam <robert <at> roberthallam.com> writes:

> | time_base rational number
> | Set codec time base.

This is an option for FFmpeg-internal encoders 
that you try to use for an external encoder 
(x264).

[...]

>  However, for aesthetics I would like to include 
> short transitions between these parts. This would 
> normally incur a long re-encode of the entire set 
> of clips which I would like to avoid to save time 
> and transcoding something already in a lossy 
> format.

I don't think this is possible.

Carl Eugen