[FFmpeg-user] join two video files portions

[frank10]

Il 02/02/2013 10:06, Carl Eugen Hoyos ha scritto:
> There is a concat demuxer that should allow this
> combined with -ss
I looked at the -ss option, but it seems to work with a start position 
while I need to count from the end of the video
and I don't know its duration.


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

It's ok also in more steps.
It could be:
1) determine actual duration of video file
2) subtract 5sec from it and use it as a start position for -ss

If needed I could use a c++ prog for it.

frank