Patent ID: 8942541
Filing Date: 2015-01-27
Classification: G11B,H04N

Abstract:
1. A non-transitory computer-readable recording medium comprising a recording area that has recorded thereon an AV stream, stream information, and a restoration program calculating a restoration parameter when executed, wherein the AV stream includes a primary video stream and a secondary video stream, the primary video stream and the secondary video stream each including a masked table multiplexed therein and each being divided into a plurality of restoration segments, each of the restoration segments is composed of one or more TS packets, the TS packets each being either a transformed TS packet or a non-transformed TS packet, the restoration program, when executed, restores a transformed TS packet by (i) calculating a restoration parameter for the restoration segment including the transformed TS packet based on a segment identifier provided to the restoration segment, (ii) performing a calculation using the masked table and the restoration parameter, and (iii) overwriting the transformed TS packet with a result of the calculation, the restoration program calculating a different restoration parameter for each of the restoration segments, the stream information includes: a first entry map indicating a plurality of associations each associating (a) a start position of, among the TS packets composing the primary video stream, a group of TS packets which constitute an entry point with (b) a presentation time stamp of the group of TS packets of the primary video stream; and a second entry map indicating a plurality of associations each associating (a) a start position of, among the TS packets composing the secondary video stream, a group of TS packets which constitute an entry point with (b) a presentation time stamp of the group of TS packets of the secondary video stream, each group of TS packets constituting an entry point stores an intra-frame encoded image therein, each TS packet which constitutes one of the entry points of the secondary video stream and whose presentation time stamp is in a predetermined relationship with a presentation time stamp of every N-th entry point of the primary video stream, is a non-transformed TS packet, N being an integer of 2 or more, and each of the restoration segments, other than a final one of the restoration segments, has the same fixed number of entry points.