Basically you use tool on ispyconnect website to create a video stream that the program VLC can use. While running VLC with the right settings the program is saving a constant snapshot JPG file. You are basically using VLC's Scene Filter to create the JPG file. This JPG file is being overwritten periodically after every so many frames which you configured in VLC. Then you can use an FTP program to schedule an FTP upload of this created JPG file to WU.