fn parse_event(line: &str, fps: f64) -> Option<Event>
001 AX V C 00:00:00:00 00:00:02:00 00:00:00:00 00:00:02:00 (a D/W adds a frame count).
001 AX V C 00:00:00:00 00:00:02:00 00:00:00:00 00:00:02:00
D
W