AV Stream Recording Packet Management for Playlist Flexibility
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Solution Overview
Problem
Conventional recording and playback apparatuses face challenges in user-friendly playlist management, resume playback functionality, and efficient navigation display, particularly on optical discs with large capacities, where users cannot arbitrarily rearrange playlist order and processing times increase significantly with large storage capacities.
Innovation Solution
The introduction of a management unit and upper management layer that handles all playlist information as integrated information, enabling user-defined playback ranges and resume playback control, along with pre-generated thumbnails for high-speed navigation display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If playlist information is managed as management level 1 equivalently as program set information, then the order of playlists is determined uniquely, but it becomes impossible to change the display order of playlists on the user interface
Solution Approach 1:
The patent introduces a new management dimension by adding management level 2 (playlist integrated information) above management level 1 (program set information). This hierarchical structure allows playlist display order to be controlled independently from the underlying program organization, enabling flexible reordering without changing the fundamental management structure.
Solution Approach 2:
The patent segments playlist management into two distinct levels: management level 1 for program set information and management level 2 for playlist integrated information. This segmentation allows independent control of playlist ordering at level 2 while preserving the program structure at level 1, resolving the contradiction between flexibility and structure.
2Quantity of substance
If optical disc is used as recording medium, then large storage capacity is achieved, but switching speed between read and write operations is low
Solution Approach 1:
The patent pre-generates and records thumbnail images during the recording process rather than generating them on-demand during playback. This preliminary action stores navigation data in advance, enabling fast thumbnail display during playback without requiring high-speed real-time processing, thus compensating for the slow switching speed of optical discs.
3Productivity
If thumbnails are generated and displayed from compressed AV data on high-capacity media, then navigation display is provided, but processing time increases significantly
Solution Approach 1:
The patent generates thumbnail images during the recording process and stores them as navigation data on the recording medium. When playback occurs, these pre-generated thumbnails are directly displayed without requiring real-time generation from compressed AV data, dramatically reducing processing time and enabling fast navigation even on high-capacity media.
Data Source
AI summary
A recording method of recording received digital broadcasting on a medium, wherein a stream other than first and last portions is recorded with a predetermined number of recording packets, and the number of recording packets of the first and last portions of an AV stream file is recorded as management data. This method, which records an AV stream basically with a specified number of recording packets in order to improve the performance of access to a medium, thereby makes it possible to improve the splitting accuracy when the user splits a program, overcoming a restriction caused by the specified number of recording packets.