BD-ROM Marker Information for Controlled Cue-Up Access
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Solution Overview
Problem
Interactive AV software content allows users to inadvertently access answer videos by repeating skip operations, compromising the intended operationality and creator advantages.
Innovation Solution
A recording medium with marker information that specifies playback positions, using attribute information to control whether user skip operations can jump to certain positions, ensuring answer videos are only played upon correct user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If marker information is used to enable user-skip function for jumping to cue positions, then ease of operation is improved, but reliability deteriorates because users can inadvertently access answer videos by repeating skip operations
Solution Approach 1:
The patent applies local quality by differentiating the properties of marker information based on location. Entry marks are made accessible to user-skip operations, while link points are made inaccessible. This is achieved by setting different attribute values (e.g., skip_allowed flag) for different marker positions, allowing the system to provide ease of operation where appropriate while maintaining content protection where needed.
Solution Approach 2:
The patent implements preliminary action by pre-defining the attributes of marker information during content authoring. The creator specifies which markers should be accessible to user-skip operations and which should be protected before the content is even played. This advance configuration ensures that the answer video cannot be accessed by skip operations while allowing free navigation elsewhere in the content.
2Reliability
If AV functions are disabled to prevent access to answer videos, then reliability is improved, but ease of operation deteriorates because users lose the ability to navigate content
Solution Approach 1:
Instead of disabling AV functions globally, the patent applies local quality by making the protection selective. User-skip operations are permitted for most cue positions (Entry marks) to maintain ease of operation, but blocked only at specific protected positions (link points) where answer videos are located. This selective approach preserves navigation capability while ensuring content protection.
Solution Approach 2:
The patent segments the cue positions into different categories: Entry marks that are accessible to user-skip operations and link points that are protected. By dividing the marker information into these segments with different access permissions, the system maintains overall ease of operation while protecting specific critical content segments.
3Ease of operation
If answer video is made accessible through skip operations, then ease of operation is improved, but object-generated harmful factors worsen because the content integrity is compromised
Solution Approach 1:
The patent applies preliminary anti-action by preemptively blocking user-skip operations from reaching link points before the harmful effect (unauthorized access to answer video) can occur. The attribute configuration prevents the skip operation from jumping to protected positions, countering the potential harm before it happens. Users can still access these positions through proper interactive functions, maintaining content integrity.
Data Source
AI summary
An AVClip, and a PLMark specifying a playback start position in the AVCLip, are recorded on a BD-ROM. A cue-up operation for choosing a playback start position in the AVClip is performed by three types of instructions, namely a user-skip operation, a chapter search operation, and a Link command.Among these three types of instructions, attribute information included in marker information indicates whether only a branching command operation is allowed for choosing a corresponding playback start position, or the user-skip operation and the chapter search operation are allowed adding to the branching command.