This additional source information 503 may include information regarding a device state e. g. , IR mode, AE mode, DTPZ settings, etc. and/or information regarding the environment in which the device is located e. g. , indoors, outdoors, night time, day time, etc. In some implementations, the source information 503 is used by the server system 164 to perform event detection and/or to categorize event candidates. In some implementations, the additional source information 503 includes one or more preliminary results from video processing performed by the camera 118 or 106 e. g. , categorizations, object recognitions, motion masks, etc.