[FFmpeg-user] Can we merge slices of two videos ?

[Roger Pack]

> So ultimately I want to merge two live videos which are taken as two input and I am expecting merged single video as an output.
> (I dont want fixed size videos as an inputs).

So creating an "interleaved" new video?  I'm unaware of a filter that
does that, but you could probably write one (and if you do, submit it
for inclusion)...if that's what you want anyway :)
-r