Same Duration CCTV Videos have different Files sizes

Hello;

I have four CCTV video all have taken from the same security camera on four consecutive days with the same duration and time length; however, the avi file sizes vary almost 10% between the smallest and the largest ?

Any explanation ? The Camera is inside a small room where people walk in and out

I suspect an editing or tampering had taken place, but that needs to be supported

Hello;

 

I have four CCTV video all have taken from the same security camera on four consecutive days with the same duration and time length; however, the avi file sizes vary almost 10% between the smallest and the largest ?

 

Any explanation ?

 

I suspect an editing or tampering had taken place, but that needs to be supported

Hi that is normal ...... it all depends what happens in each frame.

Movement- shadows- wind on trees. Even light change will add to data

.... because of the data compression. The more change (cloud cover etc.) the more data

The Camera is inside a small room where people walk in and out

The Camera is inside a small room where people walk in and out

Hi same thing ..... how many times do people pass camera each day

Any change in view adds data ....... it is normal