Hi,
Use virtualdub to encode your own logos with the help of the filter logo.
Here are the links that will help you.
Download the Virtualdub from here. A superb video tool
h--p://prdownloads.sourceforge.net/virtualdub/VirtualDub-1_4_10.zip
Download the Logo filter for VirtualDub and copy that one to the plugins folder of the virtualdub.Here is the help and the download link.
h--p://shelob.mordor.net/dgraft/logo.html.
You can even make animated logos too.