4 and 5 megapixel cameras are not automatically recognized when connected to a TVI recorder, so you must manually select the mode in the camera settings.
Each odd and even channel are grouped(1 ∙ 2, 3 ∙ 4, 5 ∙ 6, …, 15, 16 channels work in pairs respectively), and when one channel is selected, the other channel in a group is deactivated.

As a result, half of the maximum channels in a TVI recorder in live view and playback are used.
In the case of high-resolution analog cameras, a 16 channel TVI recorder uses 8 channels only, for 8 port TVI recorder uses up to 4 channels.