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The development of IP CCTV systems was heavily hampered by the lack of compatibility of devices and low degree of flexibility in terms of future expansion. The users were not able to choose products from different manufacturers, not to mention the integration with other systems. ONVIF (Open Network Video Interface Forum) is an open industry forum aimed at coordinating efforts to set common, global standard for IP CCTV systems.

Currently, H.264 compression has become a standard in digital video recorders (DVRs). The most advanced devices enable the user to control the compression ratio and many parameters of the video stream injected into the network. To understand the impact of the changes and the allowed ranges, the users should know the general principles of this video compression method.