I just crudely hand-timed the video. I had 61.2 (409), 61.2, 60.2, 59.2 but it only came out to 4:01.77 so there's basically 0.6sec that should be added to the first 409 split.
splits are therefor: 61.8 (409m) - 61.2 (2:03 at 809m) - 60.2 (3:03 at 1209m) - 59.2