Abstract: An alighting assistance device D of the present disclosure may be a device moving a driver seat rearward in a case where a determination may be made that an occupant seated on the driver seat of a vehicle alights. The device may include a height changer which changes a height of a steering wheel, a sitting height acquirer which acquires a sitting height of the occupant, and a steering wheel controller 33 as one example of a height controller which controls the height changer such that the height of the steering wheel becomes lower as the sitting height acquired by the sitting height acquirer may be higher in the case where a determination is made that the occupant alights.

Abstract: An interleaving method for generating a bitstream from plural video objects containing compressed video data by arranging in the presentation order, wherein interleaved data blocks in which plural video objects are contiguously arrayed using interleaved units each longer than the shortest read time ILVUMT such that the video object presentation start and end points are aligned. The ratio between the presentation times of video objects with the shortest presentation time and video objects other than those with the shortest presentation time is within a range obtained from the shortest read time ILVUMT, the maximum jumpable distance JM, and the smallest control unit. contiguous data blocks wherein the presentation start points and end points of the video objects arrayed therein are not aligned.

Abstract: A multimedia optical disk comprising at least one information layer to which plural system streams and plural program chain information entries are recorded. The plural system streams are interleaved in group.sub.-- of.sub.-- pictures GOP units data containing at least moving pictures, and reproduction control information containing special reproduction mode information declaring the address of the next data to be reproduced according to the special reproduction mode used. The plural program chain information entries declare the system stream reproduction sequence of a program chain comprising more than one system stream. At least one system stream is shared by plural program chains. The address information of the first reproduction control information and the address information of the last reproduction control information in each system stream are recorded to the program chain information according to the system stream reproduction sequence.

Abstract: An interleaving method for generating a bitstream from plural video objects containing compressed video data by arranging in the presentation order, wherein nterleaved data blocks in which plural video objects are contiguously arrayed using interleaved units each longer than the shortest read time ILVUMT such that the video object presentation start and end points are aligned. The ratio between the presentation times of video objects with the shortest presentation time and video objects other than those with the shortest presentation time is within a range obtained from the shortest read time ILVUMT, the maximum jumpable distance JM, and the smallest control unit. contiguous data blocks wherein the presentation start points and end points of the video objects arrayed therein are not aligned.