Disc Information File Structure for Multi-Stream Recording
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Solution Overview
Problem
Current DVD technology cannot efficiently multiplex and record multiple video streams simultaneously, limiting its ability to store and reproduce interactive or special content with reduced recording capacity and processing load.
Innovation Solution
An information recording medium and apparatus that organizes content using an object data file, play list information file, and disc information file, allowing for efficient reproduction by specifying a play list, pre-command, and post-command structures, enabling the multiplexing of multiple video streams and reducing recording capacity requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple video streams are multiplexed and recorded using the program stream format of MPEG 2, then the recording capacity is increased, but the ability to reproduce interactive or special content is limited
Solution Approach 1:
The patent segments the reproduction control information into multiple independent files: an index file containing basic navigation data, a playlist file containing reproduction sequence information, and a command file containing interactive commands. This segmentation allows the system to maintain compatibility with standard MPEG-2 program streams while adding interactive capabilities through separate control files, thus resolving the contradiction between recording capacity and interactive reproduction capability.
Solution Approach 2:
The patent introduces an intermediary file system layer between the MPEG-2 program stream and the reproduction process. This intermediary layer includes the index file, playlist file, and command file that work together to provide interactive control without modifying the underlying video stream structure. The intermediary files enable special reproduction functions while maintaining the original recording capacity of the program stream format.
2Quantity of substance
If the recording capacity is reduced to save space, then the processing load is decreased, but the ability to store complex content information is compromised
Solution Approach 1:
The patent extracts the complex reproduction control information from the main program stream and places it into separate external files (playlist file and command file). This extraction reduces the complexity within the main recording structure while preserving all necessary control information in the external files. The index file serves as a lightweight reference that connects the main stream to the external control files, achieving a balance between recording capacity and content information structure.
3Adaptability or versatility
If multiple titles with complicated content information are recorded, then the versatility of the recording medium is improved, but the processing load during reproduction increases
Solution Approach 1:
The patent performs preliminary organization of reproduction control information by creating the index file, playlist file, and command file during the recording phase. This preliminary action structures all the complex multi-title information in advance, allowing the reproduction process to simply retrieve and execute pre-organized data rather than processing complex structures in real-time. The playlist file pre-defines reproduction sequences, and the command file pre-organizes interactive commands, significantly reducing the processing load during playback.
Data Source
AI summary
An information recording medium is provided with: a file for storing object data which constitutes a series of content information, such as picture information or video information and audio information, and a play list information file for storing play list information which defines a reproduction sequence of the object data by a unit of play list. The information recording medium is further provided with a disc information file for storing a plurality of title play lists including information for specifying the play list information which defines the play list to be reproduced, Pre command information and Post command information, which indicate commands to be executed before and after the reproduction, respectively, based on the play list information.