Patent ID: 8326131
Filing Date: 2012-12-04
Classification: H04N

Abstract:
1. A method, comprising: receiving a transport stream corresponding to a video stream that comprises a sequence of pictures corresponding to a video program, each of the pictures of the sequence uniquely associated with one of k successive tiers, where k is a non-negative integer number starting with a lowest tier number; receiving personal video recording assist (PVRA) information in the transport stream, the PVRA information comprising an indication of a first tier number corresponding uniquely to the pictures associated with a first tier and a second tier number corresponding uniquely to the pictures associated with a second tier different than the first tier; responsive to a request for a first trick mode, decoding a first sub-sequence of pictures beginning at one of the pictures corresponding to a random access point (RAP) and consisting of the pictures of the sequence signaled by the PVRA information as the first tier number; and responsive to a request for a second trick mode that has a different playback speed than the first trick mode, decoding a second sub-sequence beginning at the one of the pictures corresponding to a RAP and consisting of all of the pictures of the sequence signaled as the first tier number, and one or more of the pictures of the sequence signaled by the PVRA information as the second tier number, the pictures corresponding to the first tier number decodable independently of the pictures corresponding to the second tier number, wherein for all values of k, where a lowest tier number≦k≦a highest tier number, wherein receiving the PVRA information comprises receiving a tier number signaled for a decodable Tier k picture located between an rth and (r+1)th RAP of a decodable sub-sequence, the respective tier number signaled for all tiers including the lowest tier number through Tier k pictures that are located between a Tier k picture's DEP and the (r+1)th RAP.