Even though bitrate reduction can be of great importance in professional VMS systems, keeping image quality at an acceptable level is often the most critical parameter for high-security sites. These systems must be able to detect even the smallest threat, and must also allow advanced forensic study of video after an incident. Zipstream makes it possible for high-security systems to use continuous recordings, thanks to the low bitrate employed for static scenes.
Axis recommends using networked video with a variable bitrate (VBR), in which the quality adapts to the scene content in real-time. Using a constant bitrate (CBR) as a storage reduction strategy is not recommended, as important forensic details might be lost from the video due to the bitrate limit.