New software gives the display server control over the size and quality of the picture data to be encoded and transmitted, so their system only ever generates and transmits the data required by the display windows at that moment - a fraction of the norm. With no data compressed, transmitted, then later discarded, bandwidth usage is drastically reduced; and, with less data to process, each display server can run lots more screens. - One server running GscView on a Core2Duo processor feeds 100 screens with live MPEG4 video at 25fps.

Geutebrück designed the GeViScope CCTV platform to generate vast quantities of compressed data and to record a camera at one quality while streaming the same pictures at another. It could already vary the quality and picture rates for live streamed channels independently of the recorded ones. A couple of new tricks now make the encoder respond to the needs of the display server. The first is a special mechanism for monitoring the display PC and ensuring that picture data is never transmitted to it faster than it can process - a kind of speed regulator. And the second is dynamic live streaming, a process which ensures that the compression hardware always produces and transmits picture data just the right size and quality for the current display windows. To achieve this the software on the display PC constantly feeds back information to the compression hardware on what size window, and what format the viewer requires for each channel.

Since control rooms normally only need 2CIF resolution for maximised windows, and CIF is usually quite adequate elsewhere (or even QCIF for very small windows), automatic switching to CIF reduces data volume by about 50%, and switching to QCIF by another 10 to 20%. Over the whole system this represents a very large reduction of data without any appreciable loss of quality.. Switching between formats is so fast it is imperceptible, and of course if multiple PCs access the same camera then the one demanding the highest quality has its needs met.

With DLS, efficient encoding, transmission and processing enable the CCTV system to provide faster picture rates and smoother playback, and the low latency (120ms) of the MPEG4CCTV compression process allows it to control speed dome cameras. These operational advantages as well as hardware and infrastructure savings are particularly attractive for large new systems, and for existing installations where capacity is becoming an issue.