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Tutorial > DVR / NVR
Commercial websites use highly technical terminology  in order to outline the advantages of  DVR Models and other CCTV  Equipment. But rarely is the customer given any clear explanation as to  the meaning of those terms, making it difficult for the buyer to make a  choice concerning the appropriate equipment. Please find a detailed  definition of the most important DVR Specifications below.
A typical CCTV DVR Model

DVR Recording Resolution CIF, 2CIF, 4CIF, D1, Half D1
This is one of the two most important factors! There are three types of DVR Recording Resolution qualities: CIF, Half D1 and D1.
CIF: This is the lowest and out-dated  resolution-quality. Video and picture is produced at 320 X 230 Pixels.  Proper IDENTIFICATION of suspects is unlikely and chances of success in  court rather dim - unless the incident occurred very close to the  recording Security Camera. Distant subjects and objects become very  unclear. Yet even many high profile security clients keep this as their  standard recording format. There are a number of reasons for this,  mainly being Frame Rate FPS (frames per second) and least but certainly  not last to avoid 4CIF Line Interlacing
2CIF or Half D1: Semi Recording Quality / recommended  only for home and small business use. Does not produce fully  professional and reliable evidence in all situations. Up to 720 X 260  Pixels. CIF and 2CIF are sometimes preferred for frame rate advantages  and in order to avoid Line Interlacing, but both video formats require  close up camera positioning in order to reach chances of identification.
4CIF or D1:  Records at up to 720 X 520 Pixels, which  is similar to DVD Quality. In a professionally configured CCTV System  even distant suspects have a chance of identification. 4CIF is not  recommended for scenarios in which the to be identified individuals or  subjects can be expected to move swiftly. This is due to the great  downside of D1 / 4CIF being Line Interlacing.
FPS - Frames per Second - DVR Frame Rate
FPS  Frames Per Second is one of the most crucial DVR function specification  to be considered prior to the purchase of a DVR. The overal Frame Rate  determines how many frames (images) per second can be recorded for each  connected camera individually. FPS is usually (if not stated outherwise)  based on recording resolution CIF. Increase of recording reslution from  CIF to 2CIF or 4CIF (similar to D1 and DVD resolution) drastically  reduces the maximum frames per second. In order to review more detailed  information and a table of examples please click... more
Line Interlacing at 4CIF DVRs
Line Interlacing  is the one great disadvantage of configuring a DVR to record in 4CIF  Resolution. It causes a delay distortion of fast moving objects and  subjects in every second horizontal video line... more
H.264 Compression Vs MPEG4
The new H.264 Video Compression is by far superior to the older MPEG4
Ideal CCTV highly recommends H.264 because:
  • It saves almost 50 % of Hard Disk Space
  • It reduces storage cost
  • Greatly improves Remote Monitoring and View over the Web- Applications
  • Faster Internet streaming
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