Questions · Networks
Why do two cameras of the same model use different amounts?
Because of the scene. A video compressor mainly stores what changes from one image to the next: if nothing changes, it generates almost no data; if everything changes, it generates a great deal. A camera looking at a closed door and one looking at a car park with trees are the same device doing two jobs that are nothing alike.
Two surprising things follow. The first is that outdoor cameras are almost always the expensive ones in bit rate. The second is that the peak comes at night: in low light the sensor puts grain into the image, and grain is change, so the compressor treats it as movement and swells. Rain, snow and leaves in the wind do the same.
That is why a network calculated on the cameras' average bit rate works on average, and the things that matter do not happen on average.
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