Playlist File HDR SDR Stream Synchronization
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Solution Overview
Problem
Conventional DVD technology faces challenges in providing consistent playback experiences across different dynamic range environments, leading to user confusion due to differences in subtitles, menus, and audio when playing HDR-compatible and HDR-incompatible content.
Innovation Solution
A recording medium and playback device that record and play both standard dynamic range (SDR) and high dynamic range (HDR) video streams, with playlist files containing combination information for synchronized playback of elementary streams, ensuring equal numbers of streams in each category to maintain consistent viewing experiences across environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both HDR and SDR video streams are recorded with different elementary stream configurations, then playback compatibility across different dynamic range environments is improved, but user confusion increases due to inconsistent subtitles, menus, and audio
Solution Approach 1:
The video content is segmented into separate HDR and SDR elementary streams, each with its own combination information in the playlist file. This allows the playback device to select the appropriate stream configuration based on the playback environment, ensuring compatibility while maintaining consistent user experience through equal numbering of streams in each category
Solution Approach 2:
The patent changes the parameter of elementary stream configuration by ensuring equal numbers of streams of each category (video, audio, subtitle) in both HDR and SDR combination information. This parameter alignment allows consistent selection logic in playback devices, reducing user confusion while maintaining adaptability to different dynamic range environments
2Adaptability or versatility
If elementary stream configurations differ between HDR and SDR playback sections, then dynamic range adaptability is improved, but device complexity increases due to separate combination information management
Solution Approach 1:
The patent creates a copied structure of combination information for both HDR and SDR playback sections, with each having its own set of elementary streams. By copying the organizational structure and ensuring equal numbering, the system manages complexity through systematic repetition rather than arbitrary differences, making it easier for playback devices to handle both configurations
3Loss of information
If equal numbers of elementary streams are maintained in both HDR and SDR combination information, then user experience consistency is improved, but flexibility in stream selection is reduced
Solution Approach 1:
The patent makes the combination information universal by ensuring equal numbers of elementary streams of each category in both HDR and SDR configurations. This universal structure allows the same selection logic to work across different dynamic range environments, maintaining viewing experience consistency while still providing adaptability through the separate stream configurations
Data Source
AI summary
A playback method of reading out and playing streams from a recording medium is provided in which are recorded a stream file, a playlist file, first and second combination information, elementary streams that can be played at the same time with the first luminance video, and elementary streams that can be played at the same time with the second luminance video. The playback method includes in a case of playing the first luminance video, reading out any one of the elementary streams listed in the first combination information of the playlist file, and playing at the same time with the first luminance video, and in a case of playing the second luminance video, reading out any one of the elementary streams listed in the second combination information of the playlist file, and playing at the same time with the second luminance video.