First of all, I'm quite new to AE, so pls don't kill me if I'm asking obvious things here...
My problem is:
I have filmed a bird with a clear sky behind him, so I could key that bird out. The keying went ok, but what happened is that I filmed the bird from hand (due to lack of better equipment) and he jumps all over the screen, while I need him to stay in the centre of the screen.
How can I make it so that the bird stays at the center of the screen while perfoming it's flight?
You need to stabilize the footage and there a number of ways to do that and a lot of resources you might be interested in(doing a google search for (stabilize and after effects will return a lot tutorials):
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.