Page 29 - Security Today, February 2017

Another effect of transcoding is re- duced client CPU consumption. Because the scaling takes place at the VMS server, the client computer is processing less vid- eo. Furthermore, if there are multiple cli- ent computers connected and viewing the same camera, there can be system-wide processing consumption benefits.
Some VMS transcoding implementa- tions provide a Digital PTZ Cropping fea- ture resulting in additional bandwidth sav- ings when zooming digitally. Using multi streaming, the highest resolution video feed is transmitted when users zoom in, so addi- tional resolution is available to avoid pixila- tion in the image. Of course, when digitally zooming, not all of the camera’s field of view is visible, so transmitting the unseen areas uses bandwidth unnecessarily.
Using a transcoding implementation with Digital PTZ cropping capability re- sults in only the zoomed area being trans- mitted for live display. However, the full field-of-view is always recorded and avail- able as evidence for review and export.
When compared to other VMS band- width saving technologies, transcoding provides unique attributes.
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Greater bandwidth savings as com- pared to multi streaming due to more granular resolution adjustments.
Bandwidth savings when digitally zooming.
No specialized network equipment or configuration required, reducing setup time and network equipment cost. Although the VMS server CPU load may be higher, client performance is increased and client CPU consumption is decreased.
Bandwidth consumption can make a key difference in how the system is used. Centralized monitoring allows for the pos- sibility of proactive response to a security event, instead of using video surveillance only for gathering evidence. VMS based bandwidth saving technologies can often have a larger impact on bandwidth con- sumption than any other technology com- ponent, making this a key criterion for technology selection.
Brian Carle is the direc- tor of product strategy at Salient Systems.
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