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1. Hardware compression: both capturing video signal and compressing video signal are done by DSP chipset integrated on DVR board. It doesn't need the computer's CPU to do this work. It's low cost of CPU and RAM resources. In this sytem the computer CPU's task focus on answering network request, streaming the video/audio to network and saving recorded data to local hard disk.
2. Software compression: The DVR board only capture video signal but doesn't compress it, it is the computer CPU and RAM to do this compression work. It's high cost of CPU and RAM resources. In this system the computer CPU and RAM are often overloaded. It is easier to crash than hardware compression system.
You can also follow quriya.com/vb ( al ostora threads ), hpwlab.com ( michael's threads) and malthus.zapto.org ( splidit's threads to know more. They are masters in WDR operations
Most of the Known Brands like American Dynamics, Arecont Vision, Sony, Axis, Pelco, ... etc mention this clearly in the datasheets or on the web page. just search deeply in the datasheets and the web page.
Mr. Gourab miltra very Thanks for your Answer its informative one.
In my opinion, In a CCTV camera most of the Software WDR(WIDE DYNAMIC RANGE) Camera is ONVIF standard But Hardware WDR Cameras are not, And also those Hardware WDR is more costly than Software WDR am i correct?
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