Video Parameter Set Syntax Element Parsing for Layer Management
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Solution Overview
Problem
Current video coding standards, such as ITU-T H.264 and HEVC, face limitations in efficiently signaling video parameter information, which affects the decoding and encoding processes, particularly in handling complex video structures and layers.
Innovation Solution
The proposed techniques involve parsing and signaling video parameter sets that include syntax elements specifying the maximum allowed number of layers and profile tier level structures, enabling effective decoding and encoding of video data across various coding standards, including future standards like VVC, by explicitly managing layer and profile configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If video parameter information is signaled using traditional methods in current video coding standards, then the decoding process can be simplified, but the flexibility and efficiency in handling complex video structures and layers is reduced
Solution Approach 1:
The video parameter set is segmented into multiple syntax elements, each representing a specific parameter (e.g., maximum number of layers, profile tier level, output layer sets). This segmentation allows the complex parameter signaling to be broken down into manageable components that can be processed systematically during decoding, reducing the cognitive load on the decoder while maintaining comprehensive parameter control.
Solution Approach 2:
The syntax elements are defined and parsed in advance during the encoding process, establishing the video parameter set before actual video decoding occurs. This preliminary configuration allows the decoder to understand the expected structure and complexity levels beforehand, enabling more efficient processing during actual decoding without requiring complex real-time analysis.
2Adaptability or versatility
If detailed syntax elements are added to specify maximum layers and profile tier levels, then the adaptability for next-generation video coding standards is improved, but the complexity of the parameter set increases
Solution Approach 1:
The syntax elements are designed to serve multiple functions: they define current video coding parameters while also providing the framework for future extensions. The same parameter set structure can accommodate both current standards and next-generation standards like VVC, making the system universally applicable without requiring complete redesign when new standards emerge.
Solution Approach 2:
The parameter set uses a nested structure where syntax elements are organized within larger containers (e.g., profile_tier_level syntax structure containing multiple syntax elements). This nesting allows detailed parameter specifications to be contained within hierarchical frameworks, making the overall parameter set manageable and scalable for future enhancements without overwhelming complexity at the top level.
3Measurement precision
If syntax elements are parsed to specify layer configurations, then the precision of video parameter signaling is improved, but the processing time and decoding efficiency are reduced
Solution Approach 1:
The most critical parameter information is extracted into dedicated syntax elements that can be parsed efficiently. By separating the essential layer configuration data from the overall parameter set, the decoder can focus parsing resources on the most important elements first, achieving high precision where needed while minimizing overall processing time through selective parsing strategies.
Data Source
AI summary
A method of decoding video data includes: receiving a video parameter set; parsing a first syntax element in the video parameter set, wherein the first syntax element plus one specifies a maximum allowed number of layers in each coded video sequence referring to the video parameter set; and parsing a second syntax element in the video parameter set, in a case that a value of the first syntax element is greater than a threshold value, wherein the second syntax element plus one specifies a number of profile tier level syntax structure in the video parameter set.