VOD Trick Mode via Staggered Intra-Frame Intervals
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Solution Overview
Problem
Video-on-demand systems with long intra-frame intervals face challenges in supporting trick modes due to limitations in navigation resolution, as users can only fast-forward or rewind at intervals matching the intra-frame intervals, which are typically longer in compressed video streams, hindering seamless control function implementation.
Innovation Solution
Encoding multiple video streams with staggered intra-frame intervals, allowing a composite intra-frame interval that is significantly shorter than any single stream's interval, enabling the VOD server to select the nearest future intra-frame for trick mode requests, thus enhancing navigation precision and reducing delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If long intra-frame intervals are used in VOD streams to achieve higher compression and lower bitrate, then video compression efficiency is improved, but trick mode navigation resolution deteriorates
Solution Approach 1:
The video content is segmented into multiple synchronized streams (first stream, second stream, etc.) where each stream contains the same video content but with intra-frames inserted at different time intervals. This segmentation allows the system to provide fine-grained navigation points without requiring every stream to have frequent intra-frames independently.
Solution Approach 2:
Multiple video streams with different intra-frame intervals are merged into a unified trick mode support system. By combining these streams and selecting the appropriate one based on current playback position, the system achieves both high compression (long intervals in individual streams) and good navigation resolution (short effective intervals through stream switching).
2Productivity
If long intra-frame intervals are used in VOD streams, then compression efficiency is improved, but control function implementation deteriorates
Solution Approach 1:
The system dynamically selects which video stream to use based on the current playback position and the requested control operation. When fast-forward or rewind is requested, the system identifies the appropriate stream that has an intra-frame near the current position, enabling efficient control function implementation without requiring all streams to have frequent intra-frames.
Solution Approach 2:
The system changes the parameter of intra-frame interval differently across multiple streams. Each stream has a different intra-frame interval parameter, and the system selects the optimal parameter (stream) based on current operational needs, achieving both compression efficiency and ease of control.
3Loss of time
If intra-frames are inserted frequently to minimize viewing delays, then channel acquisition speed is improved, but video compression efficiency deteriorates
Solution Approach 1:
The video delivery is segmented into multiple streams with different intra-frame frequencies. This allows the system to provide quick channel acquisition (by selecting a stream with an intra-frame near the current position) while maintaining overall compression efficiency (by using longer intervals in individual streams).
Solution Approach 2:
Multiple copies of the video content are created with different intra-frame insertion patterns. These copies serve different purposes: some prioritize compression, others prioritize quick access. The system selects the appropriate copy based on operational context, achieving both compression efficiency and fast acquisition.
Data Source
AI summary
A video-on-demand system encodes multiple video streams from media content, such that the video streams have staggered intra-frame intervals. When a client device requests a video stream, the video-on-demand system selects one of the multiple video streams based on the position of the intra-frames, and transmits the selected video stream to the client device.