VVC Decoder Configuration Record Picture Width Height Signaling
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Solution Overview
Problem
The VVC video file format lacks signaling of picture width and height in its decoder configuration records and operating points, leading to incomplete capability indications and potential errors in video bitstream decoding.
Innovation Solution
Incorporating signaling for picture width and height in the VVC Decoder Configuration Record and Operating Point Group Box, ensuring these parameters are included when the track contains a specific output layer set or is a single-layer bitstream, and using 16, 24, or 32 bits to represent them, depending on the format rule.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If picture width and height signaling is added to decoder configuration records, then capability indication completeness is improved, but data structure complexity increases
Solution Approach 1:
The patent segments the configuration record into conditional sections: picture width and height signaling is only included when specific conditions are met (single-layer bitstream or presence of output layer set). This segmentation allows complete capability indication only when needed, while keeping the structure simpler for other cases.
Solution Approach 2:
The configuration record structure becomes dynamic based on bitstream characteristics. The patent makes picture width and height fields conditionally present rather than fixed, allowing the data structure to adapt its complexity to the specific decoding scenario, thus improving completeness only when necessary.
2Reliability
If picture width and height are always included in configuration records, then decoding reliability is improved, but bandwidth usage increases
Solution Approach 1:
The patent extracts picture width and height signaling from the mandatory configuration record structure and places it in a conditional section. These parameters are taken out and only included when specifically needed for reliable decoding, preventing unnecessary bandwidth consumption in cases where the information is already available or not required.
Solution Approach 2:
The patent changes the presence parameter of picture width and height fields from constant (always present) to variable (conditionally present). This parameter change allows the configuration record to maintain reliability only when the parameters are actually needed, while reducing bandwidth usage when they are not required for decoding.
Data Source
AI summary
Systems, methods and apparatus for processing visual media data are described. One example method includes performing a conversion between visual media data and a visual media file that includes one or more tracks that store one or more bitstreams of the visual media data according to a format rule; wherein the format rule specifies whether to include, in a configuration record of a track, a first element indicative of a picture width of the track and/or a second element indicative of a picture height of the track is based on (1) whether a third element indicative of whether the track contains a specific bitstream corresponding to a specific output layer set and/or (2) whether the configuration record is for a single-layer bitstream, and wherein the format rule further specifies that the first element and/or the second element, when included in the configuration record of the track, are represented in a field including 16 bits.