Adaptive Media Stream Encoding with Compound Prediction
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Solution Overview
Problem
Existing media encoding technologies face challenges in efficiently optimizing compound prediction settings and signaling them in bitstreams, leading to increased bandwidth costs and computational complexity, particularly in low-bitrate video applications.
Innovation Solution
A system that includes detection and monitoring components to identify and decode prediction modes, a testing component for rate-distortion optimization, and an optimization component to select the optimal compound prediction setting, while also considering a threshold for bitrate to switch to non-compound prediction modes when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If compound prediction is used to improve compression efficiency, then video quality is improved, but bandwidth cost increases due to additional signaling requirements
Solution Approach 1:
The patent applies local quality by differentiating prediction modes at the macroblock level rather than uniformly across the entire frame. Each macroblock can independently select between compound prediction and non-compound prediction based on its specific characteristics, allowing optimal compression efficiency while minimizing overall bandwidth consumption through selective signaling.
Solution Approach 2:
The system dynamically adjusts prediction parameters based on rate-distortion analysis. The optimization component modifies prediction mode parameters adaptively, switching between compound and non-compound prediction settings depending on the specific macroblock characteristics and current encoding conditions, thereby optimizing the balance between quality and bandwidth usage.
2Measurement precision
If compound prediction settings are signaled in the bitstream to enable adaptive decoding, then decoding accuracy is improved, but bandwidth consumption increases
Solution Approach 1:
Instead of signaling compound prediction settings for the entire frame, the patent implements local quality at the macroblock level. Only macroblocks that use compound prediction require specific signaling, while others can use default settings. This selective signaling approach maintains decoding accuracy for affected regions while significantly reducing overall bandwidth consumption.
Solution Approach 2:
The system applies partial action by implementing compound prediction and its signaling only where necessary (in macroblocks that benefit from it) rather than universally across all macroblocks. This partial application reduces the total signaling overhead while maintaining the benefits of adaptive decoding for the relevant portions of the video data.
3Productivity
If rate-distortion optimization is performed for each macroblock to select optimal prediction modes, then encoding efficiency is improved, but computational complexity increases
Solution Approach 1:
The optimization component dynamically adjusts prediction parameters based on rate-distortion analysis for each macroblock. By changing prediction mode parameters adaptively rather than using fixed settings, the system achieves encoding efficiency optimized for each local region while managing computational complexity through targeted optimization rather than exhaustive search.
Solution Approach 2:
The system implements dynamics by making prediction mode selection adaptive and variable rather than static. Each macroblock can dynamically switch between compound and non-compound prediction modes based on real-time rate-distortion analysis, allowing the encoding process to adapt to varying video characteristics and optimize efficiency for each specific macroblock condition.
Data Source
AI summary
A method and apparatus for adaptively encoding a media stream with compound prediction are provided. Adaptively encoding a media stream with compound prediction may include decoding a first compound prediction use indicator for decoding a current frame, on a condition that the first compound prediction use indicator indicates that the encoded video stream includes a compound prediction mode for the current block, decoding the compound prediction mode for the current block from the encoded video stream and decoding the current block using the compound prediction mode, and on a condition that the first compound prediction use indicator indicates that the encoded video stream includes a second compound prediction use indicator, decoding the second compound prediction use indicator from the encoded video stream and decoding the current block based on the second compound prediction use indicator; and outputting or storing the decoded current block.