Video Bitstream Encapsulation for LRAP Random Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing video encoding methods using a library picture as a reference picture face inefficiencies in accessing and processing video bitstreams containing reference library picture samples, leading to complex processing and waste of transmission bandwidth.
Innovation Solution
The encapsulation of Library Random Access Point (LRAP) sample information and library picture sample information into a media container file, allowing direct identification and decoding of LRAP samples as random access points and reference pictures, reducing processing complexity and optimizing bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a library picture is used as a reference picture for inter-frame prediction, then video encoding efficiency is improved, but the complexity of accessing and processing video bitstream increases
Solution Approach 1:
The patent segments the video bitstream processing by introducing LRAP samples that separate random access points from library picture samples. This segmentation allows the decoding system to identify and process only necessary portions of the bitstream for random access operations, reducing overall processing complexity while maintaining encoding efficiency benefits
Solution Approach 2:
The patent introduces LRAP samples as intermediary elements between traditional IRAP pictures and library picture samples. These LRAP samples serve as mediators that carry metadata information about library picture references, enabling efficient random access without requiring complex processing of the entire bitstream
2Reliability
If traditional IRAP pictures are used for random access, then access points are provided, but encoding cost and bitstream size increase significantly
Solution Approach 1:
Instead of creating full intra-frame encoded copies of pictures for random access points, the patent uses LRAP samples that contain metadata references to library picture samples. This copying approach allows random access functionality to be achieved through lightweight reference pointers rather than duplicating full picture data, significantly reducing bitstream size
Solution Approach 2:
The patent changes the fundamental parameter of random access point representation from full intra-frame encoded pictures to compact metadata-based references. By transforming the access point structure from self-contained picture data to reference-based pointers, the bitstream size is dramatically reduced while maintaining random access reliability
3Adaptability or versatility
If library picture samples are embedded in the bitstream, then reference functionality is enabled, but accessing and processing becomes inefficient
Solution Approach 1:
The patent performs preliminary organization of library picture samples and LRAP sample information during the encoding phase. By pre-structuring the bitstream with properly marked LRAP samples that contain advance information about library picture references, the decoding system can efficiently access reference pictures without performing complex runtime analysis, thereby improving access efficiency
Data Source
AI summary
Embodiments of the present disclosure provide a video bitstream encapsulation method and apparatus, a video bitstream decoding method and apparatus, and a video bitstream access method and apparatus. The video bitstream encapsulation method includes: encapsulating information of a Library Random Access Point (LRAP) sample in a first video bitstream into a media container file in which the first video bitstream is encapsulated; and encapsulating information of a library picture sample of the LRAP sample into the media container file, wherein the library picture sample is a reference picture sample of the LRAP sample.