Panoramic Video Stream Switching for Low-Bandwidth 360 Viewing
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Solution Overview
Problem
Panoramic videos require high network bandwidth due to their 360-degree coverage, making efficient transmission challenging under low bandwidth conditions.
Innovation Solution
A method that determines a user's current viewing region, acquires and decodes a target video stream for that region, and switches to a new stream with a low-resolution background bitstream when the viewing region changes, reducing the need to transmit and process the entire panoramic video.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the entire panoramic video is transmitted to ensure complete 360-degree coverage, then the video content completeness is improved, but the network bandwidth requirement increases significantly
Solution Approach 1:
The panoramic video is divided into multiple video slices based on spatial regions. Each slice corresponds to a specific viewing region, allowing the system to transmit only the relevant slice to the client. This segmentation enables selective transmission of video content based on user viewing direction, reducing the overall bandwidth requirement while maintaining complete coverage capability.
Solution Approach 2:
The system extracts and transmits only the necessary video slice corresponding to the user's current viewing region, rather than transmitting the entire panoramic video. By extracting the relevant portion based on viewing direction information, the system reduces transmitted data volume while ensuring the user receives complete visual information for their current view.
2Stability of the object's composition
If a low-resolution background bitstream is displayed during switching to maintain smooth transitions, then the viewing continuity is improved, but the transmission bandwidth is increased
Solution Approach 1:
During video slice switching, the system displays a low-resolution background bitstream partially, rather than transmitting a complete high-resolution stream. This partial action provides enough visual information to maintain viewing continuity and prevent black screens during transitions, while using significantly less bandwidth than a full high-resolution stream would require.
Solution Approach 2:
The system dynamically changes the resolution parameter of the background bitstream during switching transitions. By using low-resolution background content during transitions and switching to full resolution when stable, the system maintains viewing continuity while optimizing bandwidth usage based on the current operational state.
3Productivity
If video slicing is implemented to reduce bandwidth, then the network efficiency is improved, but the system complexity increases
Solution Approach 1:
The panoramic video is segmented into multiple video slices, and the system maintains a mapping relationship between viewing regions and slice indices. This segmentation approach improves network efficiency by enabling selective transmission, while the mapping mechanism provides a systematic way to manage the complexity of slice selection and switching.
Solution Approach 2:
The system uses viewing direction information as feedback to determine which video slice to transmit. By continuously monitoring the user's viewing direction and using this information to select the appropriate slice, the system optimizes network efficiency dynamically while managing complexity through a clear feedback-driven selection process.
Data Source
AI summary
In some aspects of the present disclosure, a processing method for a panoramic video is provided. A current viewing region of a user is determined, and a corresponding target video stream can be acquired based on the viewing region. The target video stream can be decoded and rendered to the viewing region. In respect to detecting that the viewing region of the user changes, a new target video stream corresponding to the changed viewing region can be determined, and a background bitstream can be displayed during a process of switching to the new target video stream. The background bitstream may include a low-resolution bitstream of the panoramic video.