[FFmpeg-user] How to concatenate mp4 files using ffmpeg?

[Roger Pack]

> What I want to do is concatenate several mp4 files with the same fps,
> resolution and other characteristics into an output file whose length is
> the sum of the lengths of the input files (that is, it plays all input
> files one after the other). I should be something simple, but I only
> managed to do it with mencoder:

see concat:
http://ffmpeg.org/faq.html#How-can-I-join-video-files_003f