After discussing with Simon, I know solving the 'edge' problems with Roto-Brush is apparently not a path worths going through. I will stick with key-lighting Green-Screen shots then. In addition, I hope it is still not too late to know 720p uncompressed footage should always be used to work on and should only be compressed to H264 at the very last step. (Although it means that I have to re-convert all the Green-Screen footages into uncompressed format again.)
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