Installation:
OpenSuse user can use "1-click" installer to install Avidemux
OpenSuse 11.1 - here
OpenSuse 11.0 - here
After sucessfull installation, open the application (Start >> Application >> Multimedia)
For Ubuntu user, Avidemux can install easily by opening the console and typing
sudo apt-get install avidemux
Once installed, you will find on the menu Applications / Sound & Video / Avidemux
To split a file or a section of a file do the following.
Open and select the file you want to split (File / Open).
Then, with the bar below, select the point where we want to start our video and clicking on the letter A using icon
and mark point B 
where you want to end (cut) your video (as shown in the figure below)
Finally from the menu select File / Save / Save Video
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source:http://linuxpoison.blogspot.com/2009/06/135781757114523.html