Input Loss Behavior

It is also possible that during a session, the video input will be lost. This is also most commonly caused by external factors such as a broken cable, power being lost at the source equipment, unstable on uncontrolled satellite sources and so on.
You can also select the behavior in the case of lost video;

The recording can be stopped which might be used in a monitored siltation where there are many incoming lines and only a few source devices.
More common however would be to force the recording to continue so images will immediately be recorded when the picture is restored.

In this case you can select to record black while there is no source or to record a freeze frame of the last good captured frame.
The recommended setting is black to make it clear to any observer that there is no useful signal being recorded.