Vivotek IP Surveillance User Manual download pdf (Page 55)

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48 - User's Manual

Please note that if your Network Camera does not support time shift caching stream or does not enable this

function, the settings of the following two items will be invalid�

f� Activate time shift stream recording if possible: Check this item to enable the time shift cache on the

Network Camera, which will enable pre-event recording for a few seconds depending on the cache

memory of each Network Camera�

If you enable this function for Network Camera A, only when an event is triggered on Camera A will

ST7501 Server request the cache stream from it� In this way, ST7501 Server does not have to keep

long-term video streaming with Camera A, thus effectively save lots of bandwidths�

g� Minimum pre-event time: This function will be enabled if you check step f� Due to the limited cache

memory of each Network Camera, the pre-event time for caching stream may be very short� Here you

can preset a duration for the time shift cash stream�

For example: To set up minimum 5 seconds� If the cache memory of the selected Network Camera

cannot support up to 5 seconds, the ST7501 Server will switch to enable pre-event recording by itself (as

the illustration shows in step d�, 10 seconds pre-event time), rather than request the time shift cache

stream from the Network Camera�

Recording Path for DefaultGroup

h� The default Recording path is C:\Recording. The total space and free space of the disk is shown

below for reference� To modify the Reserved space of a path, select the path in Recording path for

DefaultGroup, then click Change settings to modify�

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Vivotek IP Surveillance User Manual Page 55