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Pre-buffering is possible because the system continuously receives audio and video streams from the
connected devices and temporarily stores them for the defined pre-buffer period.
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If a recording rule is triggered, the temporary recordings are made permanent for the rule’s configured
pre-recording time
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If no recording rule is triggered, the temporary recordings in the pre-buffer are automatically deleted
after the defined pre-buffer time
Storage of the temporary pre-buffer recordings
You can choose the storage location of the temporary pre-buffer recordings:
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In the memory; the pre-buffer period is limited to 15 seconds.
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On the disk (in the media database); you can choose all values.
Storage to the memory instead of to disk improves system performance but is only possible for shorter pre-
buffer periods.
When recordings are stored in the memory, and you make some of the temporary recordings permanent, the
remaining temporary recordings are deleted and cannot be restored. If you need to be able to keep the
remaining recordings, store the recordings on the disk.
Authentication
Active Directory (explained)
Active Directory is a distributed directory service implemented by Microsoft for Windows domain networks. It is
included in most Windows Server operating systems. It identifies resources on a network in order for users or
applications to access them.
With the Active Directory installed, you can add Windows users from Active Directory, but you also have the
option of adding basic users without Active Directory. There are certain system limitations related to basic
users.
Users (explained)
The term users primarily refers to users who connect to the surveillance system through the clients. You can
configure such users in two ways:
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As basic users, authenticated by a user name/password combination
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As Windows users, authenticated based on their Windows login
Administrator manual | XProtect® VMS 2023 R1
61 | Overview
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