Video Multiplexer Using Start-of-Segment Identifiers for Low-Latency Switching
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Solution Overview
Problem
The existing video multiplexing systems for digital cable television distribution face challenges in efficiently managing high-end, per-user services with advanced features like on-demand programming, which require low-latency and cost-effective solutions for creating custom program multiplexes, while also needing to prevent unauthorized access and maintain infrastructure efficiency.
Innovation Solution
The system employs a session manager, video server, and multiplexer that use start-of-segment identifiers to facilitate seamless transitions between video streams, allowing for rapid switching and buffer management to maintain video quality, and integrates encryption for secure content delivery, optimizing existing infrastructure with minimal modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional video multiplexing systems are used to provide on-demand services, then service functionality is available, but latency is high and infrastructure costs increase
Solution Approach 1:
The system pre-positions video segments and their corresponding start-of-segment identifiers in buffers before client requests arrive. When a client requests on-demand service, the multiplexer can immediately switch to the pre-positioned segment without waiting for processing or transmission delays, thereby reducing latency while maintaining manageable infrastructure complexity
Solution Approach 2:
The patent divides video content into discrete segments with identifiable start points (start-of-segment identifiers). This segmentation allows the multiplexer to quickly locate and switch between specific segments without processing entire video streams, reducing the time required for program changes and on-demand service delivery while keeping the system architecture relatively simple
2Speed
If rapid switching between video streams is implemented, then program change speed improves, but video quality and buffer management become more difficult
Solution Approach 1:
The system pre-fills buffers with video segments and places start-of-segment identifiers at buffer boundaries before switching is needed. This preliminary preparation allows rapid program changes without causing buffer underflows or video quality degradation, as the multiplexer can immediately switch to pre-positioned content
Solution Approach 2:
The start-of-segment identifier acts as an intermediary marker that facilitates smooth transitions between video streams. These identifiers enable the multiplexer to precisely locate segment boundaries and execute clean switches without corrupting video data or compromising quality, while maintaining high switching speeds
3Reliability
If encryption is integrated into the multiplexing system, then content security improves, but system complexity and processing overhead increase
Solution Approach 1:
The patent combines encryption functionality with the existing video multiplexing system by integrating the encryption module within the multiplexer architecture. This merging allows content security to be implemented without adding separate, independent security systems, thereby improving content security while minimizing the increase in overall system complexity
Solution Approach 2:
The multiplexer is designed to perform multiple functions simultaneously: video stream switching, segment identification, buffer management, and content encryption. By making the system multi-functional, the patent achieves content security without requiring dedicated separate infrastructure, thus improving security while keeping system complexity manageable
Data Source
AI summary
An advanced multiplexer designed and optimized for next generation on-demand video distribution is described. Features and capabilities include low-latency client interactions, quality of service management, session based encryption management, support for multiple video formats, and support for multiple video decoding standards. Indicators are embedded in new video segments to identify start-of-segment transition points, enabling rapid transitions from one video segment to another. Low-latency operation is achieved by rapid switching, and by coordinating flushing of video buffers and buffer restoration.