Hostname or IP address - address to the camera. Usually a local area network IP address.
Port - image and/or control HTTP connection port. Other ports are set separately. Usually 80.
Username - user name for the camera, one that has rights to receive image stream and change settings.
Password - password for the user.
Image resolution - camera image resolution.
Connect to the camera - open a new connection to the camera. If a connection is currently open, it will be closed first.
Bitrate / MPEG4 Bitrate - image stream bitrate. Usually has a direct effect to the image quality.