Multi-layer video stream decoding with direct decoding flags
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Solution Overview
Problem
The existing HEVC multi-layer video stream decoding methods are inefficient in signaling layer dependencies, requiring many bits to convey this information, which affects transmission duration and bitrate, especially in scenarios like network congestion or device limitations.
Innovation Solution
A method and device for determining and signaling decoding relationships in a multi-layer video stream by retrieving direct decoding flags and scalability identifiers, allowing for efficient mapping of layer indices to identifiers and predicting operations, thereby reducing the number of bits required for signaling layer dependencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If parameter sets are sent repeatedly in the bitstream for error resiliency, then reliability is improved, but bitrate increases
Solution Approach 1:
The parameter set information is segmented into two parts: essential parameters sent once out-of-band during session setup, and incremental updates sent in-band only when changes occur. This segmentation allows error resiliency through redundant essential parameters while minimizing bitrate overhead by sending only necessary updates.
Solution Approach 2:
Essential parameter set information is transmitted preliminarily out-of-band during session setup before actual video decoding begins. This preliminary action ensures that critical decoding parameters are available immediately, improving reliability without requiring repeated in-band transmission and thus reducing overall bitrate.
2Quantity of substance
If parameter sets are sent out-of-band during session setup, then bitrate is reduced, but transmission duration increases
Solution Approach 1:
Parameter transmission is segmented into out-of-band session setup phase and in-band runtime phase. The out-of-band phase handles essential parameters to minimize start-up bitrate impact, while the in-band phase handles incremental updates efficiently. This segmentation balances bitrate reduction with acceptable session establishment time.
Solution Approach 2:
The out-of-band transmission mechanism serves multiple functions: it establishes essential parameter sets during session setup, provides error resiliency through redundant transmission, and enables rapid session establishment. This multi-functionality justifies the initial transmission duration while achieving long-term bitrate efficiency.
3Measurement precision
If many bits are used to signal layer dependencies, then decoding accuracy is improved, but transmission efficiency deteriorates
Solution Approach 1:
Layer dependency information is transmitted with local quality adaptation: essential direct decoding flags are sent with high precision to ensure accurate decoding relationships, while scalability identifier mappings use compact representations. This local quality approach maintains decoding accuracy for critical information while optimizing transmission efficiency for less critical data.
Solution Approach 2:
The patent changes the parameter representation for layer dependencies from traditional extensive signaling to a compact form using direct decoding flags combined with scalability identifier mappings. This parameter transformation reduces the number of bits required while preserving the essential decoding relationship information, thereby improving transmission efficiency without sacrificing decoding accuracy.
Data Source
AI summary
Multi-layer dependencies are signaled in an efficient way for a multi-view video stream. Coding or decoding relationship information defining coding or decoding dependencies is represented in bit-efficient syntax code, preferably through usage of hierarchical layer dependencies using layer indices for representing layer dependencies.