[MEncoder-users] concatenate MP4 files with mencoder command

[Pengpeng]

hi ,everyone , i'm newbi  here,
there are two files :  /home/pt/sbd0.mp4 
                              /home/pt/sbd1.mp4 

in  my computer 
how to  concatenate them into new one mp4  file with mencoder command? 
think for your help in advance.