A first transition between a first video segment and a second video segment is detected by a first detector (105). A second transition is detected by a second detector (107). The first and second detectors (105, 107) are different. The outputs of the first and second detectors (105, 107) are compared (109). The reliability of the second method is determined by comparing the transition detected by the first detector (105) with the transition detected by the second detector (107). At least the second transition is used to determine a final transition if the second method is determined to be reliable. The second transition is not used to determine the final transition if the second method is determined to be unreliable.