[FFmpeg-user] join two video files portions

[Carl Eugen Hoyos]

frank10 <aruForum10 <at> deveritate.net> writes:

> I have two avi videos and I want to make a third one merged like this:
> videoC = the latest 5 sec of videoA + all the videoB

There is a concat demuxer that should allow this 
combined with -ss

> Also, the videoA could be opened and recording from a webcam, 
> so I could not know which is its length.

I don't think this is possible (in one step).

Carl Eugen