Playback Control Means for Non-Normal Operation Restriction
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Solution Overview
Problem
Conventional DVD video systems fail to effectively control search-based user operations, such as jumping to a specified playback position, leading to incomplete prevention of skipping certain ranges during playback, as skipping can occur through jump-to-next-point commands unless both chapter jumping and non-normal-speed operations are prohibited.
Innovation Solution
A playback apparatus and method that utilize second and first playback management information to control playback operations, including jump destination information and permission settings, to restrict non-normal playback operations by managing playback positions and user interactions, ensuring that certain operations are only permitted within defined limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chapter jumping and non-normal-speed operations are prohibited to prevent skipping, then playback sequence control is improved, but user operation flexibility deteriorates
Solution Approach 1:
The content is divided into multiple PlayItems with individual permission settings. Each PlayItem can have independent control over jump operations and non-normal speed operations, allowing selective restriction without affecting the entire content. This segmentation enables precise control where only specific segments require protection while maintaining user flexibility in other areas.
Solution Approach 2:
Different permission settings (first permission information and second permission information) are applied to different PlayItems based on their specific requirements. Some PlayItems allow jump operations while others prohibit them, and similarly for non-normal speed operations. This local differentiation resolves the contradiction by applying restrictions only where necessary rather than globally.
2Ease of operation
If jump operations are permitted for random access, then user access flexibility is improved, but prevention of skipping prohibited ranges deteriorates
Solution Approach 1:
The permission system is dynamic and context-dependent. The playback control means evaluates the current PlayItem's permission settings in real-time to determine whether to permit jump operations. This dynamic control allows jump operations in some contexts while preventing them in others, resolving the contradiction between flexibility and prevention.
Solution Approach 2:
The system uses permission information as feedback to control jump operations. When a jump operation is requested, the playback control means checks the second permission information of the target PlayItem and responds accordingly - permitting the jump if allowed, or rejecting it and maintaining normal playback sequence if prohibited. This feedback mechanism ensures both user flexibility and skipping prevention.
Data Source
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AI summary
The present invention relates to a playback apparatus, playback method, a storage apparatus, a storage method, a program, a storage medium, a data structure, and a method of producing a storage medium, capable of controlling non-normal playback operations. In a state in which PlayItem_random_access_flag is set to 0 for PlayItem(1) and PlayItem(3) and an Entry Mark is defined in PLayItem(2) for which PlayItem_random_access_flag is set to 1, if a user operation occurs to request a jump to the Entry Mark in PlayItem(2) when a Clip AV stream pointed to by PlayItem (Æ) is being played back, the playback position jumps not to the Entry Mark in PlayItem(2) but to the beginning of a Clip AV stream pointed to by PlayItem(2). The present invention is applicable to a playback apparatus and a storage apparatus.