Optical Disc Subplayitem Data Structure for Flexible Subtitle Management
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Solution Overview
Problem
Current high-density optical discs, such as Blu-ray, lack standardized methods for managing and displaying auxiliary presentation data, like subtitles, which limits user flexibility during video playback.
Innovation Solution
A data structure is introduced that includes subplayitems and playitems to navigate and manage auxiliary presentation data, allowing separate recording and reproduction of main and auxiliary data streams, with options for multiplexing or out-of-mux recording, and the use of URL-style representations for linking text subtitle streams to main A/V streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If auxiliary presentation data is recorded as bitmap-formatted image data on DVD, then the data can be displayed on screen during playback, but the user cannot choose and watch different subtitles flexibly during reproduction
Solution Approach 1:
The auxiliary presentation data is segmented into multiple clip information files, each representing a separate subtitle stream. The playlist structure divides the navigation information into playitems and subplayitems, where subplayitems specifically manage auxiliary data clips. This segmentation allows the system to handle multiple subtitle languages and formats independently while maintaining a structured organization that enables flexible user selection during playback.
2Ease of manufacture
If separate clips of auxiliary presentation data and main presentation data are stored, then the data can be managed independently, but the navigation and synchronization between them becomes complex
Solution Approach 1:
The playlist structure serves as an intermediary that links main presentation data (playitems) with auxiliary presentation data (subplayitems). Each subplayitem contains navigation information that references specific clip information files, while the overall playlist coordinates the playback timing and synchronization between main and auxiliary streams. This intermediary structure simplifies management by providing a centralized navigation layer that handles the relationships between separate data clips without requiring complex direct connections between them.
Data Source
AI summary
In the data structure for managing reproduction of text subtitle data, a recording area stores at least one subplayitem. The subplayitem identifies more than one clip information file name, and each clip information file named by the subplayitem indicates an associated clip of auxiliary presentation data to reproduce from the recording medium. The auxiliary presentation data in each clip is associated with at least a portion of main presentation data recorded on the recording medium, and the subplayitem indicates a single presentation interval for the associated clips.