Recording Medium Editability Flags for Legacy Compatibility
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Solution Overview
Problem
Legacy devices cannot edit video content recorded in new formats with higher image resolution and grayscale, leading to loss of valuable video content, as they only process data common to old formats, and struggle with large data sizes, making recording media impractical for high-resolution recordings.
Innovation Solution
A recording medium with a stream file and index file, where the index file includes an editability flag and an extended editability flag, allowing the medium to be treated as editable or non-editable based on device compatibility, preventing rewriting of new format information and ensuring compatibility with both legacy and non-legacy devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a recording medium uses a new format with higher image resolution and grayscale, then video quality is improved, but compatibility with legacy devices deteriorates
Solution Approach 1:
The video data is segmented into common portions (compatible with legacy devices) and extended portions (new format features). The index file is segmented to include separate flags for editable and non-editable portions, allowing legacy devices to access common portions while non-legacy devices can utilize the full high-resolution content.
Solution Approach 2:
Different portions of the recording medium are assigned different quality characteristics. The common portions maintain compatibility with legacy devices, while the extended portions provide enhanced video quality for non-legacy devices. The editability flags allow selective access to different quality levels based on device capability.
2Ease of operation
If a legacy device edits video data on a new format recording medium, then editing functionality is provided, but loss of extended format information occurs
Solution Approach 1:
The system preemptively prevents legacy devices from editing extended format information by setting the non-editable flag in the index file. This preliminary protective measure ensures that when a legacy device attempts to edit the recording medium, it can only modify common portions, thereby preserving the extended format information from loss.
Solution Approach 2:
The index file with editability flags acts as an intermediary between the legacy device and the extended format information. It mediates the editing process by informing the legacy device which portions are editable and which are protected, allowing the legacy device to provide editing functionality for common portions while preserving extended format information.
3Manufacturing precision
If the data size of compress-encoded image is increased for higher resolution, then video quality is improved, but recording medium practicality deteriorates
Solution Approach 1:
The recording medium is segmented into common portions with smaller data sizes that are practical for legacy devices, and extended portions with larger data sizes that provide higher resolution for non-legacy devices. This segmentation allows the recording medium to be practical for both legacy and non-legacy devices simultaneously.
Solution Approach 2:
The system changes the data size parameter selectively across different portions of the recording medium. Common portions use smaller data sizes for practicality and compatibility, while extended portions use larger data sizes for high resolution. The editability flags enable dynamic control over which portions are accessible based on device capabilities.
Data Source
AI summary
A rewritable recording medium on which Index.bdmv is recorded in the BDMV directory. The Index.bdmv includes editability_flag and extended_editability_flag. When the editability_flag is set ON, it indicates that the recording medium is treated as an editable medium by a legacy device which does not support recording and editing of stereoscopic video. When the editability_flag is set OFF, it indicates that the recording medium is treated as a non-editable medium by the legacy device. When the extended_editability_flag is set ON, it indicates that the recording medium is treated as an editable medium by a non-legacy device even when the editability flag is set OFF, where the non-legacy device supports recording and editing of stereoscopic video.