How to combine avi files together

Hi,
I was trying to combine the 2 avi files and finally came with the good output. Here are the commands I've used to do it.

1) First rename the files to be appended with sequential numbers in it.

cat v1.avi v2.avi > vtest.avi

2) Then invoke mencoder to get the audio and video synchronization.

mencoder -forceidx -oac copy -ovc copy vtest.avi -o vtest_final.avi

This made my totem movie player works

Struggled a long to make my totem player work, finally the ubuntuforumn gives a break,

Below is the apt-get I ran,

sudo apt-get install ubuntu-restricted-extras