Constraints and unit types to simplify video random access

摘要

Disclosed herein are innovations for bitstreams having clean random access (CRA) pictures and/or other types of random access point (RAP) pictures. New type definitions and strategic constraints on types of RAP pictures can simplify mapping of units of elementary video stream data to a container format. Such innovations can help improve the ability for video coding systems to more flexibly perform adaptive video delivery, production editing, commercial insertion, and the like.

主权项

1. A method, comprising:
designating a picture as being one of a plurality of picture types, wherein the picture types include:
a first type indicating that the picture is a broken link access (BLA) picture capable of being used as a random access point (RAP) picture and that the picture does not have any associated non-decodable leading pictures but may have one or more associated decodable leading pictures, anda second type indicating that the picture is a BLA picture capable of being used as a RAP picture and that the picture does not have any associated leading pictures; and generating at least part of a bitstream, the at least part of the bitstream comprising the picture type designated for the picture, wherein the picture is designated as a picture of the first type, and wherein the method further comprises designating a leading picture associated with the picture as a random access decodable leading (RADL) picture.