Bit Rate Allocation for MPEG2 Video Channels
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Solution Overview
Problem
There is a challenge in optimally assigning bit rates to multiple MPEG-compatible video channels to ensure a constant bit rate output stream without buffer overflow, while maintaining the best possible output quality during the transmission of multimedia data over fixed bandwidth channels.
Innovation Solution
A closed loop controller is used to parse complexity data from each encoder, which includes information about timing, frame type, and bit requirements, to determine the optimal bit allocation for each channel, ensuring that the total bit rate is maintained at a constant level and quality is optimized.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple video channels are multiplexed into a single output stream with fixed bit rate, then the transmission bandwidth is efficiently utilized, but it becomes difficult to maintain optimal quality for each individual channel
Solution Approach 1:
The patent implements dynamic bit rate allocation that assigns different bit rates to different video channels based on their individual complexity requirements. Each channel receives a customized bit rate rather than a uniform allocation, allowing high-complexity channels to receive more bits for maintained quality while low-complexity channels use fewer bits, thus optimizing both transmission efficiency and per-channel quality
Solution Approach 2:
The system employs a closed-loop controller that continuously monitors complexity data from each encoder and dynamically adjusts bit rate allocations in real-time. This dynamic adaptation allows the system to respond to changing video content characteristics, ensuring optimal quality transmission while maintaining efficient bandwidth utilization across all multiplexed channels
2Manufacturing precision
If bit rates are dynamically adjusted for each channel based on complexity data, then output quality is optimized, but the system complexity increases due to closed loop control requirements
Solution Approach 1:
The patent implements a closed-loop control system where complexity data from each encoder is continuously fed back to a central controller. This feedback mechanism enables the system to automatically adjust bit rate allocations based on actual channel conditions and complexity measurements, optimizing output quality through real-time adaptation while maintaining manageable system complexity through automated control
Solution Approach 2:
Each encoder generates its own complexity data that is used to determine its bit rate allocation, eliminating the need for external quality assessment systems. The system serves itself by using internally-generated complexity information to make autonomous bit rate decisions, reducing overall system complexity while maintaining high output quality
3Productivity
If a fixed number of bits is allocated to multiple channels, then transmission bandwidth is efficiently used, but buffer overflow may occur when channel complexity varies
Solution Approach 1:
The patent transforms the static fixed bit rate allocation into a dynamic system that continuously adapts to channel complexity variations. The closed-loop controller adjusts bit rate allocations in real-time based on complexity data, preventing buffer overflow by ensuring each channel receives appropriate bit rates matching its actual complexity requirements while maintaining efficient overall bandwidth utilization
Solution Approach 2:
The system uses complexity data feedback from each encoder to continuously monitor and adjust bit rate allocations. This feedback mechanism provides early warning of potential buffer overflow conditions by detecting increases in channel complexity before they manifest as buffer issues, allowing proactive adjustment of bit rates to maintain buffer stability while preserving bandwidth efficiency
Data Source
AI summary
The present invention relates generally to systems, methods, and computer program products for optimally allocating a fixed number of bits among a plurality of multi-media data channels. The optimal number of bits is determined by preprocessing each channel to calculate complexity data, and then the complexity data is used to determine the optimal number of bits to assign to each channel. The optimal number of bits may be determined by a closed loop controller in communication with one or more channel encoders, and the multi-media channels may contain video data conforming to the MPEG2 video format.