add_marker_at_time
Description:
Adds a named marker that will be hit when the timeline has been running for msecs milliseconds.
Markers are unique string identifiers for a given position on the timeline. Once this reaches the given
msecs, it will emit a marker_reached signal for each
marker attached to that position.
A marker can be removed with remove_marker. The timeline can be advanced to a marker using advance_to_marker.
See also: add_marker
Parameters:
| this |
a Timeline |
| marker_name |
the unique name for this marker |
| msecs |
position of the marker in milliseconds |