Dynamic DASH Picture-in-Picture Signaling via MPD Updates
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Solution Overview
Problem
MPEG DASH lacks explicit signaling for picture-in-picture streaming, and existing methods fail to provide interoperable solutions for dynamic changes in the location, size, and resolution of picture-in-picture media content during streaming sessions.
Innovation Solution
Implement a method and apparatus for dynamically signaling picture-in-picture video using DASH streaming by identifying main and picture-in-picture video streams with role values, merging them as a combined stream, and updating the media presentation descriptor (MPD) to manage location, size, and resolution changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MPEG DASH standard is used for streaming media content, then interoperability and standardization are improved, but explicit picture-in-picture signaling capability deteriorates
Solution Approach 1:
The patent segments the video content into separate main video streams and picture-in-picture video streams, each with distinct role values. This segmentation allows the DASH system to handle multiple video layers independently while maintaining standard interoperability, resolving the contradiction between standardization and PIP signaling capability
Solution Approach 2:
The patent introduces role values as intermediary metadata elements within the DASH manifest structure. These role values act as mediators that enable picture-in-picture signaling without modifying the core DASH standard, thus maintaining interoperability while adding PIP functionality
2Ease of manufacture
If picture-in-picture streaming is implemented without explicit DASH extensions, then implementation simplicity is improved, but dynamic updating of location, size, and resolution deteriorates
Solution Approach 1:
The patent implements dynamic picture-in-picture signaling by allowing role values and preselection descriptors to be updated in real-time within the DASH manifest. This enables location, size, and resolution parameters to change dynamically during streaming sessions while maintaining relatively simple implementation based on existing DASH update mechanisms
3Adaptability or versatility
If implicit methods are used for picture-in-picture signaling, then compatibility with existing systems is improved, but interoperability and standardization deteriorates
Solution Approach 1:
The patent creates a universal picture-in-picture signaling mechanism using role values that can be applied across different DASH implementations. The preselection descriptor provides a standardized method that works across systems, ensuring both compatibility with existing DASH infrastructure and improved interoperability through consistent PIP handling
Data Source
AI summary
A method and apparatus may be provided for dynamically signaling picture-in-picture video during media streaming. The method may include determining whether video data comprises a first main video stream and a second picture-in-picture video stream based on a first role value associated with the first main video stream and a second role value associated with the second picture-in-picture video stream; determining a preselection descriptor indicating that the second picture-in-picture video stream is selected to be signaled with the first main video stream in the DASH media streaming; merging the first main video stream with the second picture-in-picture video stream as a combined video stream using the preselection descriptor; and updating the preselection descriptor using an update media presentation descriptor (MPD).