I have an AVI file created with Crazy Talk for youtube and have another AVI file created by converting powerpoint with narration to avi. I wish to join the 2 and submit to youtube, is it possible to combine the 2?

I have a program which I want to introduce with CrazyTalk and then demonstrate how it works with the other avi created with Wondershare Demo creator.

My email adddress is joseph@paconsulting.net.au and would appreciate any help

Joseph