gobats

There is a particular camera on my NVR which I would like to use to create a weekly timelapse. Basically I want to take an image every 30 seconds between the hours of 7am and 5pm Mon-Sat. These images would then be used to make a weekly time lapse video (4min video @ 30fps). I am wanting to export these images to an FTP server and I will make the time lapse on my local computer. I only access this particular NVR remotely via the SmartPSS software and whilst I can export video (very slowly) I cannot find a way to set up a schedule of images. Does anyone know of a piece of software that can achieve what I am trying to do? I should add that the network speeds from this site are horrific so exporting video and then cutting out a frame every 30 seconds is definitely not an option. Thanks to anyone who can recommend a solution!