[FFmpeg-user] Concatenating mp4s Quickly

[Jan Ehrhardt]

Paul Jungwirth in gmane.comp.video.ffmpeg.user (Wed, 10 Apr 2013
15:54:39 -0700):
>I'm trying to use ffmpeg to concatenate about a half-dozen mp4 files
>in order to create a longer mp4. I don't need to do any other
>processing other than concating the files.

You are better off with mp4box.
http://gpac.wp.mines-telecom.fr/mp4box/mp4box-documentation/

$ mp4box -align-cat -cat first.mp4 -cat second.mp4 -new concatenated.mp4

Jan