Optical Disc Path Management Data Structure for Multi-Path Video
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Solution Overview
Problem
Current data structures for high-density read-only optical disks, such as Blu-ray ROM, lack an effective method for managing the reproduction of video and audio data, particularly for multiple reproduction paths like different camera angles or versions of a title.
Innovation Solution
The proposed solution involves a recording medium with path management information that includes entry point maps and flags to manage changes in reproduction paths, allowing seamless switching between different reproduction paths by dividing video data into jumping units and multiplexing audio and video data efficiently to minimize bandwidth loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current data structures for high-density read-only optical disks are used, then the disk format is simple and well-established, but the reproduction of multiple reproduction path video data cannot be effectively managed
Solution Approach 1:
The patent segments video data into multiple reproduction paths (e.g., different camera angles, versions) and organizes them with dedicated management structures including path management information, entry point maps for each path, and flags indicating permitted path changes. This segmentation allows independent management of each reproduction path while maintaining overall system organization.
Solution Approach 2:
The patent implements nested data structures where path management information contains multiple entry point maps (one for each reproduction path), which in turn contain multiple flags for each entry point. This nested organization allows hierarchical management of complex multi-path reproduction data within the existing optical disk file structure.
2Ease of operation
If seamless switching between reproduction paths is enabled, then user flexibility is improved, but bandwidth loss increases due to data retransmission
Solution Approach 1:
The patent performs preliminary actions by pre-organizing video data into jumping units with entry point maps that identify valid path change locations before reproduction begins. Flags are pre-set to indicate which entry points permit path changes, allowing the system to quickly determine seamless switching opportunities without real-time analysis, thus minimizing bandwidth loss.
Solution Approach 2:
The patent enables skipping through non-essential data during path switching by using entry point maps to directly locate valid transition points. Instead of transmitting or processing intermediate data between arbitrary path change requests, the system jumps directly to pre-identified entry points where path changes are permitted, reducing bandwidth consumption.
3Productivity
If video data is divided into jumping units for path management, then path switching efficiency is improved, but the complexity of data organization increases
Solution Approach 1:
The patent segments video data into jumping units that align with entry points in the entry point maps. Each jumping unit represents a manageable segment where path switching can occur at defined boundaries. This segmentation improves switching efficiency by providing clear transition points while organizing complexity into uniform, repeatable units throughout the video data structure.
Data Source
AI summary
The recording medium has a data structure for managing reproduction of at least multiple reproduction path video data recorded on the recording medium. One or more management areas of the recording medium store path change information. The path change information indicates where changes in reproducing at least one of the reproduction paths of video data are permitted.