Video Conformance Point Signaling for Multi-Profile Decodability
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Solution Overview
Problem
Existing video coding standards like VVC face challenges in efficiently representing millions or billions of potential sub-profiles due to impractical bitmask sizes, necessitating a novel mechanism to indicate compatibility with multiple profiles or sub-profiles.
Innovation Solution
A method and device for media encoding that utilizes a syntax structure with a loop containing a fixed number of iterations to indicate multiple sub-profiles, using identifiers like T.35 strings or UUIDs, allowing flexible and efficient representation of sub-profiles in the bitstream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple conformance point indications are decoded and processed to ensure decodability, then the reliability of video decoding is improved, but the computational complexity and processing time increase
Solution Approach 1:
The patent applies preliminary action by determining decodability based on conformance point indications before actual video decoding occurs. The method checks level, tier, and profile conformance point indications in advance to assess whether the decoded video sequence will meet decodability requirements, allowing the system to prepare appropriately before committing to full decoding operations.
Solution Approach 2:
The system performs self-service by autonomously evaluating its own decodability capabilities against the received conformance point indications. The decoding device independently determines whether it can decode the video sequence by comparing the indications against its capabilities, without requiring external verification or manual intervention.
2Measurement precision
If conformance point indications are decoded and evaluated, then the measurement precision of decodability assessment is improved, but the loss of time in processing increases
Solution Approach 1:
The patent extracts only the essential conformance point indications (level, tier, profile) from the bitstream for decodability assessment, rather than processing all video data. By taking out and evaluating only these specific parameters, the system achieves accurate decodability measurement without the time cost of analyzing the entire video sequence.
Solution Approach 2:
The method applies partial action by performing a limited assessment using only the necessary conformance point indications rather than exhaustive analysis. This partial evaluation of level, tier, and profile parameters provides sufficient precision for decodability determination while minimizing processing time.
3Productivity
If selective decoding is performed based on decodability determination, then the productivity of the decoding system is improved, but the manufacturing precision of video quality control deteriorates
Solution Approach 1:
The patent applies dynamics by making the decoding process adaptive based on decodability determination results. The system dynamically adjusts whether to proceed with full decoding based on the assessment of conformance point indications, enabling flexible productivity optimization while maintaining quality control through the preliminary accuracy checks of level, tier, and profile conformance.
Data Source
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AI summary
A method and apparatus for media decoding by a decoder include decoding a first indication indicative of a first conformance point of a coded video sequence. A second indication indicative of a second conformance point of the coded video sequence is decoded. It is determined whether the coded video sequence is decodable by the decoder based on at least one of the first indication and the second indication. The coded video sequence is selectively decoded based on determining whether the decoded video sequence is decodable by the decoder.