cut and merge mp4 files

[fenomeno83]

hello...how can I cut a .mp4 file (h264 video,aac audio)?and for mp4 with mp4v video and aac audio?
and how can I merge more mp4 files (merge mp4 files with mp4v video or merge mp4 files with h264 video)?thanks

[Affar]

You can edit MP4 with yamb (simple edit).

http://yamb.unite-video.com/