Video Parameter Set Extension for Decoder Picture Buffer Optimization
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Solution Overview
Problem
The increasing popularity of digital media poses challenges in efficiently representing, storing, and rapidly playing back high-quality digital media, particularly in terms of storage and transmission.
Innovation Solution
A method for decoding a video bitstream that involves receiving a base bitstream and enhancement bitstreams, along with a video parameter set containing syntax elements for decoded picture buffer parameters, to optimize the representation and playback of digital media by determining and signaling appropriate decoding unit removal delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If decoded picture buffer parameters are signaled for each enhancement layer separately, then decoding precision is improved, but device complexity increases
Solution Approach 1:
The patent combines decoded picture buffer parameters from base layer and enhancement layers into a unified parameter set. The video parameter set extension syntax structure merges dpb_output_delay parameters and other buffer control parameters across multiple layers, allowing the decoder to manage buffer operations with consolidated parameters rather than separate parameters for each layer, thereby reducing device complexity while maintaining decoding precision.
Solution Approach 2:
The video parameter set extension structure serves multiple functions simultaneously: it carries decoded picture buffer parameters for both base and enhancement layers, signals removal delay information, and provides a unified interface for buffer management. This multi-functional parameter set eliminates the need for separate parameter signaling mechanisms for different layer types, reducing overall system complexity.
2Reliability
If removal delay parameters are signaled for all decoding units, then playback reliability is improved, but loss of information increases due to overhead
Solution Approach 1:
The patent extracts and signals only the essential removal delay parameters that are critical for playback reliability, rather than signaling all possible buffer parameters. The video parameter set extension selectively includes dpb_output_delay parameters and removal delay information needed for correct playback timing, eliminating unnecessary overhead while maintaining reliability.
Solution Approach 2:
The removal delay parameters are signaled in advance in the video parameter set extension before actual decoding and playback operations. This preliminary signaling of buffer timing parameters allows the decoder to pre-configure buffer management, ensuring reliable playback without needing to transmit additional timing information during the actual playback process, thereby reducing overall information overhead.
Data Source
AI summary
A system for encoding and/or decoding a video bitstream that includes a base bitstream and enhancement bitstreams representative of a video sequence. The receiver receives a video parameter set and a video parameter set extension, where the video parameter set extension includes decoder picture buffer parameters.