Source Picture Timing Messages for Temporal Sublayer Video Decoding
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Solution Overview
Problem
Existing video coding standards lack efficient mechanisms for signaling source picture timing information, which is crucial for accurate decoding and display of video content, particularly in advanced coding formats like ITU-T H.266.
Innovation Solution
The proposed techniques involve signaling a source picture timing information message that includes a maximum number of temporal sublayers and specific scale factors for determining the source picture interval of consecutive pictures in output order, enabling precise timing information exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If video coding standards use traditional signaling mechanisms, then the bitstream structure remains simple, but the accuracy of source picture timing information is insufficient
Solution Approach 1:
The timing information is segmented into multiple syntax elements organized in a hierarchical structure. The source picture timing information message is divided into temporal sublayers, with each sublayer containing specific timing parameters. This segmentation allows precise timing representation while maintaining structured bitstream organization that decoders can efficiently parse.
Solution Approach 2:
The patent introduces a new dimensional structure for timing information by creating a multi-level hierarchy with temporal sublayers. Instead of using a single flat signaling mechanism, the timing information is organized across multiple dimensions (temporal sublayers, scale factors, picture intervals), enabling more precise timing representation without linearly increasing overall complexity.
2Reliability
If video coding standards signal detailed timing information for each picture, then decoding accuracy improves, but data transmission overhead increases
Solution Approach 1:
The patent applies partial action by signaling timing information selectively rather than redundantly for every picture. The hierarchical structure with temporal sublayers allows the decoder to derive timing information for multiple pictures from a condensed set of syntax elements, reducing the total quantity of timing data transmitted while maintaining decoding accuracy for all necessary pictures.
Solution Approach 2:
The patent uses parameter changes by introducing scale factors that can be applied to base timing values. Instead of transmitting absolute timing information for each picture, the system transmits base values and scale factors that can be mathematically transformed to derive the actual timing, significantly reducing data overhead while preserving precision.
3Productivity
If video coding standards support advanced coding formats like H.266, then video compression efficiency improves, but the complexity of timing management increases
Solution Approach 1:
The patent creates a universal timing information structure that serves multiple functions within the H.266 framework. The same hierarchical syntax element structure supports both the enhanced compression features and the timing management requirements, allowing a single mechanism to handle diverse timing scenarios without requiring separate specialized structures for different coding modes.
Data Source
AI summary
A device may be configured to decode video data based on information included in a source picture timing information message. In one example, a source picture timing information message includes a syntax element specifying a maximum number of temporal sublayers. In one example, a source picture timing information message includes instances of a syntax element specifying a scale factor used in determining the source picture interval of corresponding consecutive pictures in output order for each of the maximum number of temporal sublayers other than a highest of the maximum number of temporal sublayers.