Support for trick modes in HEVC streams

摘要

Assistance information related to a tier framework may describe signaling for extractable and decodable sub-sequences based on pictures interdependencies. This may allow a video application to efficiently select pictures when performing a given trick mode.

主权项

1. A method comprising:
receiving a High Efficiency Video Coding (“HEVC”)-coded bitstream containing plural elementary streams of a first video program; presenting a user interface to a viewer providing options to control trick mode functionality; receiving a request for trick mode operation from a user; interpreting assistance information contained in data fields of the bitstream to provide the requested trick mode, wherein the assistance information comprises picture interdependencies related by successive tier numbers; and processing, based on the assistance information, the received bitstream to provide the requested trick mode, wherein processing the received bitstream comprises:
extracting a self-decodable stream from the plural elementary stream, andextracting, based on the tier numbers, reference pictures from the self-decodable stream, wherein a predetermined tier number is assigned to a largest tier number that is assigned to reference pictures that are intended to be extracted for trick mode.