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Vivotek ST7501 Manual

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VIVOTEK - A Leading Provider of Multimedia Communication Solutions
22 - User's Manual
e. Congure Recording Settings:
Recording Stream: By default, the stream source of the recording stream is stream 1, if you want to
change it later on, please refer to page 20 to update the camera settings.
Pre-event time: Enter a number to decide how much time to record before an event is triggered.
Post-event time: Enter a number to decide the duration of recording after an event is triggered.
For example: If both the Pre-event time and Postevent time are set to 10 seconds, a total of 20
seconds video will be recorded if an event triggers. This function is supported by the buffer area of
ST7501 server (time shift cache stream).
Minimum pre-event time: Due to the limited cache memory of each network camera, the pre-event
time of time shift cache stream on camera may be very short. Then you can choose to set pre-event
recording on the ST7501 server. For example: To set up minimum 5 seconds. If the cache memory
of the selected Network Camera can only support up to 3 seconds, the ST7501 Server will switch to
enable pre-event recording for 5 seconds by itself, rather than request the time shift cache stream
from the network camera server.
Please note that if you want to enable activity adaptive stream, we suggest you right-click the camera on the
heirarchical management tree > Camera Settings > Audio and Video to activate "Time Shift Cache Stream" on
the camera and select a stream source. This will help record complete pre-event recording.
Activity Adaptive Stream (active if possible): Check
this item to enable activity adaptive stream recording
and time shift recording. For cameras combined
with time-shift cache stream and multiple streams
features, user can make use of activity adaptive
streaming for dynamic frame control.
If you check Activate Activity Adaptive Stream and
enable time-shift cache stream on the camera,
only when an event is triggered on the camera will
ST7501 Server record the full frame rate streaming
data; otherwise, it will only request the I frame data
during normal monitoring, thus effectively save lots
of bandwidths and storage.
Time
Bandwidth
Bandwidth
Activity Adaptive Streaming
for Dynamic Frame Rate Control
I frame ---> Full frame rate ---> I frame
Continuous recording
post-
10 sec.
pre-
10 sec.
Trigger Activation
Pre-event time
Post-event time
e
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