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Specifies what Media Server should do after enrolling an image in the database.
None- do nothing.
Build- train Media Server using the new image.
BuildNull- train Media Server using the new image and then remove the image data from the database.
Training Media Server to recognize a face means that the face can be recognized as soon as Media Server synchronizes with the database. If you are running face recognition on a video and enrolling unknown faces, building the enrolled faces can prevent Media Server adding duplicate entries to the database if the same face is detected again.