Gazzzah

Hi, I have the HTC desire S. I recently made an awesome looping video and want to make it a live wallpaper. How do I go about doing this? What file formate must I make it? What dimensions must it be? How do I then get it on the phone so that it may be used as a live wallpaper?

chrstdvd

Well, this should get you started or discourage you from even trying see post 4 in the first therad. The others give more info, and the last is about your phone in particular.
How to remove (live)wallpaper - xda-developers
Where exactly are the stock HTC wallpapers stored? - xda-developers
[Question] Galaxy S and HTC Sense Live Wallpapers - xda-developers

chrstdvd

Here is one more if you get brave.
Best way to edit Live Wallpapers :: Amazing tutorial