Tool to split mp4s into segments without reencoding?

[Xirix]

I have several large mp4 files, time-wise, lots of 6 hours plus and I'd like to make them a bit more manageable.

Are there any programs that you can set a time increment and then put an mp4 file in to automatically split it into lots of parts?

[ndjamena]

MP4Box -split

-split time_sec splits in files of time_sec max duration
* Note: this removes all MPEG-4 Systems media