Sir...I am new to Ubuntu 9.10.But after reading some tips I was able to
install vlc player,handbrake,a free DVD ripper.Now I downloaded a DVD creating tool by nameDEVEDE (devede_3.16.8-0~rastersoft1_all.deb).But it
is asking mencoder which I could not install even after installing many
unuversal and multiverse codecs related to mencoder and mplayer.
Therefore I request you to kindly tell me how to install
first mpalayer and mencoder also tell me source installing(normally a deb)
packages of mencoder and mplayer.Please give me detailes for offline installation only.Finally tell me how to install DVD creator DEVEDE i.e devede_3.16.8-0~rastersoft1_all.deb.Thanking you.....

Why don't you use the Software Centre or Synaptic Package manager and install the version available there? It would help you to avoid possible compatibility issues. Like you said, you are new to Ubuntu, do things the safe way first before installing software from different sources.