Blu-ray Stereoscopic Video Stream Synchronization via PCR
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Solution Overview
Problem
The Blu-Ray standard lacks specifications for recording and playing stereoscopic image data, specifically requiring synchronization between the left and right image data streams to ensure proper playback.
Innovation Solution
A method is introduced where the basic and extended video streams, encoded using a predetermined method, are recorded with synchronized DTS and PCR settings for decoding and display sequences, ensuring that each picture in the streams is aligned correctly during playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate transport streams are used for basic and extended video streams, then flexibility in encoding and storage is improved, but synchronization between the two streams becomes difficult to maintain
Solution Approach 1:
The patent introduces PCR (Program Clock Reference) as an intermediary time reference that both basic and extended streams use to synchronize their packets. By setting DTS and PTS values based on PCR, the system maintains reliable synchronization between separate transport streams while preserving encoding flexibility.
Solution Approach 2:
The patent changes the time reference parameter from independent stream timing to a unified PCR-based timing system. By setting DTS (Decoding Time Stamp) and PTS (Presentation Time Stamp) parameters based on the same PCR reference in both streams, synchronization is achieved without compromising the adaptability of the encoding format.
2Ease of operation
If DTS and PTS are set independently for each stream, then stream processing simplicity is improved, but picture alignment between basic and extended streams deteriorates
Solution Approach 1:
The patent creates equipotential timing conditions by setting both DTS and PTS in both basic and extended streams to reference the same PCR values. This ensures that pictures at corresponding positions in both streams are perfectly aligned in time, achieving precise picture alignment while maintaining simple processing through standardized timestamp assignment.
3Adaptability or versatility
If stereoscopic image data is recorded without specific synchronization specifications, then compatibility with existing BD standards is improved, but playback synchronization reliability deteriorates
Solution Approach 1:
The patent applies universal PCR-based timing mechanisms that work across both basic and extended streams, ensuring reliable playback synchronization while maintaining compatibility with existing BD standards. The solution uses standard MPEG-2 TS synchronization methods that are already supported by BD players, achieving multi-functionality without requiring new hardware or protocol changes.
Data Source
AI summary
The present invention relates to a recoding device, a recording method, a playback device, a playback method, a program, and a recording medium, whereby synchronization between a basic stream and an extended stream obtained by encoding a plurality of video data using a predetermined encoding method to be recoded in a recording medium such as a BD or the like using a predetermined encoding method can be secured.The same point-in-time information with PCR synchronization being secured at the time of encoding is set to a packet storing the data of a certain picture of a Base view video, and a packet storing the data of the picture of the corresponding Dependent view video. Even in the event that a Base view video stream and a Dependent view video stream are each included in a different TS, the same point-in-time information is set to a packet storing the data of the corresponding picture. The present invention may be applied to a playback device compatible with the BD-ROM standard.