Adaptive Digital Video Encoding via Downscaling Distortion
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Solution Overview
Problem
Conventional digital video systems face inefficiencies and inaccuracies in encoding digital videos for diverse computing devices, often resulting in low quality and increased storage requirements due to static bitrate and resolution relationships.
Innovation Solution
A video encoding system that generates two-phase digital video encodings based on downscaling distortion and a constant rate factor transition threshold, determining distortion without encoding and using it to select efficient encoding parameters, allowing for adaptive bitrate and resolution adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional systems generate multiple video encodings with different resolutions and bitrates using static relationships, then storage requirements are reduced, but video quality deteriorates due to inaccurate encoding parameters
Solution Approach 1:
The patent changes the parameter selection approach from static predetermined relationships to dynamic selection based on downscaling distortion metrics. By calculating distortion values for different resolution-bitrate combinations and selecting parameters that minimize distortion, the system achieves both storage efficiency and high video quality. This is implemented through determining downscaling distortion for the input video and selecting encoding parameters that optimize quality while controlling storage usage.
2Device complexity
If conventional systems use adaptive constant rate factor method with single constant rate factor, then encoding process is simplified, but video quality becomes inaccurate at certain bitrates due to fixed resolution-bitrate proportions
Solution Approach 1:
The patent introduces dynamic parameter selection by determining downscaling distortion metrics and using them to adaptively choose encoding parameters. Instead of using a fixed single constant rate factor, the system dynamically adjusts resolution and bitrate selections based on calculated distortion values, allowing optimal quality at each bitrate point while maintaining manageable encoding complexity through automated metric-driven selection.
3Quantity of substance
If online video systems generate limited set of video encodings to balance quality with bitrate, then storage capacity is reduced, but encoding accuracy deteriorates due to set resolution-bitrate proportions
Solution Approach 1:
The patent implements feedback by calculating downscaling distortion metrics and using these metrics to inform parameter selection for encoding. The distortion calculation provides feedback about the quality impact of different resolution-bitrate combinations, allowing the system to select parameters that maintain high encoding accuracy while working within storage constraints. This feedback loop ensures that limited encodings are chosen optimally rather than using fixed proportions.
Data Source
AI summary
Methods, systems, and non-transitory computer readable storage media are disclosed for two-phase encoding a digital video based on downsampling distortion of the digital video and a constant rate factor transition threshold. For example, the disclosed system can determine a downsampling distortion indicating a measure of distortion resulting from downsampling an input digital video. The disclosed systems can utilize the downsampling distortion to determine a constant rate factor transition threshold for selecting sets of encoding parameters. For example, the disclosed systems can select a first set of encoding parameters below the constant rate factor transition threshold and a second set of encoding parameters at or above the constant rate factor transition threshold. Additionally, the disclosed systems can generate first and second sets of digital video encodings of the input digital video by utilizing the first and second sets of encoding parameters, respectively.