The reason for this is rather embarassing as I thought it would be a good idea to video one of my shots oppoite a mirror, so whilst the shot itself was good, the camera man plus camera are also in-shot. In order to correct this i had to match the wall colour with a rectangular mask over the mirror, and then track mask around the actor as she walked down the hall. The overall finnish is a lot better, however i was unable to hold a steady match on the wall as the light intensity on the wall changed when the actor was near and so the shape becomes more distinguishable the later on in the shot it gets. But all in all I would say a great improvement considering my lack of experience with the program (AE), but then again this would not have been necessary if I had got the shot right in the first place.
The mask is particularly obvious in this screenshot, however there is not a lot more that I could have done to correct this mistake. Fortunately at full speed, the mask is barely noticible if you are not looking for it.
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