Video Stream Restructuring for High-Speed Random Access
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Solution Overview
Problem
Existing video streaming technologies face challenges in providing high-quality visual feedback during high-speed navigation due to network bandwidth constraints and decoder limitations, with previous solutions either being inefficient or not suited for precise navigation.
Innovation Solution
The technique involves dynamically restructuring encoded video streams by retaining a subset of frames based on encoded dependencies and adjusting their timestamps to optimize frame selection and timing for smooth playback, allowing for a wide range of high-speed playback with visual feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If playback speed is increased to support high-speed navigation, then navigation speed is improved, but visual feedback quality deteriorates due to network bandwidth constraints and decoder limitations
Solution Approach 1:
The video stream is segmented into discrete frames with selective retention based on playback speed requirements. The system divides the video content into manageable frame units and selectively processes them to maintain quality during high-speed navigation, allowing independent optimization of each frame's contribution to visual feedback.
Solution Approach 2:
Frames are pre-processed and restructured before playback to anticipate high-speed navigation needs. The system performs preliminary frame selection, timestamp adjustment, and dependency resolution in advance, so that when high-speed playback is initiated, the pre-prepared frame structure enables immediate high-quality visual feedback without real-time processing bottlenecks.
2Ease of operation
If image files are generated at fixed intervals for random access, then random access capability is improved, but data efficiency deteriorates due to duplication and inefficient formats
Solution Approach 1:
The system extracts only the essential frame information needed for random access visualization, rather than generating complete duplicate image files. By pulling out key frame data and representing it in an optimized format within the video stream structure, the system enables random access capability while minimizing data overhead and avoiding redundant storage.
Solution Approach 2:
The video stream structure is designed to serve multiple functions simultaneously: it maintains efficient compressed video storage while embedding random-access-capable frame references, and supports both sequential playback and random navigation. This multi-functional design eliminates the need for separate image file generation, reducing data overhead while preserving ease of operation.
3Ease of manufacture
If frames are selected at fixed intervals for display, then processing simplicity is improved, but visual usefulness deteriorates as frames may not correlate with useful visual information
Solution Approach 1:
The frame selection process transitions from static fixed-interval sampling to dynamic selection based on encoded frame dependencies and playback context. The system adaptively determines which frames to retain and display by evaluating their informational value and temporal relationships, ensuring that selected frames consistently provide useful visual information while maintaining processing efficiency through rule-based selection criteria.
4Quantity of substance
If a subset of frames is retained based on encoded dependencies, then data efficiency is improved, but playback smoothness may deteriorate without proper timestamp adjustment
Solution Approach 1:
The system dynamically adjusts frame timestamp parameters to compensate for selective frame retention. By modifying the temporal metadata of retained frames based on their positions in the original sequence and the playback speed context, the system maintains accurate timing information that ensures smooth playback perception even though many frames have been removed from the stream.
Data Source
AI summary
Techniques are described for dynamically restructuring an encoded video stream to support a wide range of high-speed playback with accompanying visual feedback of the underlying video content. For a particular range of playback speeds, frames in each fragment are retained or dropped based on the encoded dependencies among the frames in the fragment and the selected playback speed. The set of frames in each fragment is analyzed to determine the optimal pattern of frames to retain or drop for a given playback speed. The time stamps of the retained frames are adjusted to achieve the proper spacing for the decoder.