This function searched for the earliest start time of the first clip. It can be row specific or search all clips if using "". This value can even be used in the other variable functions if it is defined before it is used.
Basic format: ["min_time_start", "row_name"]
In the following example, we want to know the start time of the game, in seconds, by looking for the first kick off
e.g: ["min_time_start", "Kick Off"]