Therefore, the question security professionals need to ask is, “How can I maximize my DVR and NVR storage, especially as I add more and more higher resolution cameras into my surveillance system?” There are several ways.
Lower recording rates at times and in areas of low activityBy controlling recording speeds, users can obtain recording savings of up to 80 percent. Typically, there is less activity in a building at night. Even during the day, many conference rooms have limited use. There is no need to be recording them at higher rates, such as 15 fps which simply take up more storage space. These slower times and areas can be recorded at only 2-3 fps.
But, what if something was to happen? A nice add-on to the system is basic motion analytics. If something happens, the frame rate goes up to normal recording speeds. When motion stops, the recording rate goes back to 2-3 fps.
Don’t record what you don’t needMotion exclusion zones can save up to 50 percent of the recording of some of your cameras. Do you need a record of the cars speeding down the freeway? What about those bushes which sway in the wind? They’re showing up, forcing the system to keep recording, as your cameras watch over your perimeter. To rectify, a nice add-on to the system is a basic motion analytics package. It eliminates unnecessary recording of cars and bushes.
How much of your old video do you need?Is your old video as important to you as your newer video? If not, reduce the number of frames in your old video. The evidence will still be there if needed, but you’ll reduce your storage space dramatically.
Choose the right CODEC in the first placeMigrating from MJPEG to H.264 can reduce storage use by 50 percent or more. That’s why security users migrated from MJPEG to MPEG-4 and now are moving to H.264, which compresses video into a smaller size yet maintains the same video quality when compared with MPEG-4.
Here’s why. With H.264, a representative frame (R-frame) is selected from a group of frames in a video sequence. Only the selected R-frame is stored. By using R-frames, H.264 can compress a video stream, thereby more efficiently generating significantly less bandwidth.