User guide

DETEXI NVR 20 - 169
Calculate Recording Storage Needs
Since the recording requires the most processing resources the recording storage needs must be
considered when building the computer system to be used as the NVR Server. Use the DETEXI online
Storage Calculator to estimate the storage needs of the NVR recording requirements in the Online
User Guide — NVR — Administration and Management — Storage Needs.
9 It is common for different cameras to require different quality recordings.
9 It is more common to sacrifice recording frame rate to preserve the highest
possible video resolution in recordings. This allows for crisper images of faces,
license plates, etc. even when the fluidity of the video is not perfect.
9 A typical recording quality of IP video is 4CIF (704x480) resolution or similar and
between 3-6 FPS. Megapixel cameras are starting to become more common now
as well, supporting maximum resolutions in the range of 1600x1200.
3. Recording Options
Recording in the DETEXI NVR is either schedule based or event based (triggered), and many
recording options are available.
Schedule Based Recording
Schedule based recording can be set up as continuous (24/7 or other schedule) with or without motion
detection or triggered. An alarm-triggered recording can be activated by, for example, video motion
detection or an external input through a camera’s input port. Scheduled recording can combine both
continuous and triggered recording instructions (within schedule).
• Recording without Motion Detection — video is recorded constantly while on schedule,
without motion analysis being done.
• Recording with Motion Detection — video is recorded constantly while on schedule, the
video is analyzed and encoded with markers when motion is detected for faster and smarter
replay.
• Recording on Motion only — video is analyzed constantly while on schedule, but only
recorded when motion is detected.
• Recording on Motion Alarm — video is analyzed constantly while on schedule; the alarm
raises when motion is detected starting the alarm video recording and execution of assigned
task. An assigned task must not include the Record Camera action because a video stream
is already initiated.
• Recording on Input Alarm — the hard input(s) of the camera are monitored while on
schedule; when an alarm is detected the execution of assigned task starts. Recording of alarm
video occurs if only an assigned task includes the Record Camera action that initiates a
video stream from the camera.
Event Based Recording
• Recording on NVR Event (Record Camera action is included in assigned task) — video
is recorded for any defined camera when a chosen event occurs in the NVR.