While it's not perfect solution this may be some help.
I've been enjoying Freemake since I found it, it's so simple.
I haven't given up on Avidemux but I got tied of playing with it for now it's building season and I have other stuff to work on. Freemake will allow you to do a direct HD upload to YouTube or convert the file to an avi to work with in WMM.
Hope this helps.