DVD+RW Navigation Structure for Unplayable Title Warnings
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Solution Overview
Problem
DVD+RW format discs do not provide users with clear visual or audible warnings when an encrypted or empty title is selected, leading to confusion as the player skips to the next title without explanation, causing users to play a different title than intended.
Innovation Solution
A navigation structure is implemented that redirects the user from the Video Title Set (VTS) domain to the Video Manager (VMG) domain, where an informational page is displayed explaining why the selected title cannot be played, and automatically switches to the next title after a predefined time or user interaction, using additional pre-commands in the VTS and VMG PGC Command Tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the DVD+RW format is used to allow title encryption and editing, then the disc becomes rewritable and programmable, but the player skips to the next title without providing user warning when an encrypted or empty title is selected
Solution Approach 1:
The patent applies preliminary action by executing pre-commands before the main title playback is initiated. When a user selects an encrypted or empty title, the system executes special pre-commands that display a warning message to the user before the playback actually starts. This preliminary warning action prevents user confusion by informing them in advance that the selected title cannot be played, allowing the user to make a different selection before the player automatically skips to the next title.
2Loss of information
If additional information titles and warnings are added to the Video Title Set Menu (VTSM), then user information about unplayable titles is provided, but this violates the DVD+RW video specifications
Solution Approach 1:
The patent uses an intermediary approach by introducing a special warning message that acts as a mediator between the encrypted/empty title and the user. Instead of directly modifying the VTSM structure (which would violate specifications), the system inserts a warning message as an intermediate element in the playback sequence. This warning message is triggered by special pre-commands and serves as a bridge to inform the user about the unplayable title without requiring changes to the core DVD+RW video structure.
Solution Approach 2:
The patent extracts the warning functionality from the traditional VTSM structure. Rather than embedding warning titles within the Video Title Set Menu (which would violate DVD+RW specifications), the warning message is extracted and implemented through a separate mechanism using pre-commands in the Program Chain. This allows the warning function to exist independently of the restricted VTSM structure, maintaining specification compliance while still providing necessary user information.
3Productivity
If the player automatically skips to the next title when an encrypted or empty title is selected, then playback continues without interruption, but the user is confused because a different title is played than the one selected
Solution Approach 1:
The patent implements feedback by providing real-time information to the user about what is happening during the title selection process. When a user selects an encrypted or empty title, the system displays a warning message that gives feedback about the unplayability of the selected title. This feedback mechanism maintains continuous playback by automatically transitioning to the next title after the warning, but it simultaneously informs the user about the situation, eliminating confusion about why a different title is being played.
Data Source
AI summary
A navigation structure and method is provided to provide a user with additional information for better user-interaction and understanding of a DVD+RW (DVD- Rewritable) optical disc. More particularly, a user interacting with a menu system of a DVD+RW disc is provided with a visual and/or audible instruction or warning, in response to the user selecting a non-playable title (14) from the menu system. The instruction or warning explains to the user why the selected title (14) cannot be played back and that a next title (16) will be presented in a certain period of time or after a user interaction.