Dynamic Group of Pictures Size Adjustment for Video Encoding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing sophistication and volume of digital video content in broadband networks lead to higher encoding and compression burdens on set-top boxes, causing latency delays during channel changes due to the need for efficient bandwidth management.
Innovation Solution
A system and method to dynamically adjust the Group of Pictures (GoP) size in digital video streams based on predicted channel change requests, using triggers and user behavior analysis to reduce GoP size during likely channel changes and increase it during steady viewing periods, thereby optimizing bandwidth consumption and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If GoP size is increased to reduce bandwidth consumption, then bandwidth efficiency is improved, but channel change latency increases
Solution Approach 1:
The patent implements dynamic GoP size adjustment by monitoring channel change requests and modifying GoP structure in real-time. When channel changes are detected, the system reduces GoP size to enable faster decoding and switching. During stable viewing periods, GoP size is increased to optimize bandwidth efficiency. This dynamic adaptation resolves the contradiction by making the GoP size flexible rather than fixed.
Solution Approach 2:
The system changes the GoP parameter (size/structure) based on operational conditions. By detecting channel change requests and adjusting the GoP parameter accordingly, the system optimizes both bandwidth efficiency and channel change latency. The parameter is modified from a static value to a condition-dependent variable, allowing the system to achieve both efficiency and responsiveness.
2Loss of energy
If encoding and compression are increased to fit content through the network, then bandwidth efficiency is improved, but set-top box processing burden increases
Solution Approach 1:
The patent applies preliminary compression and encoding at the headend before transmission, reducing the processing burden on set-top boxes. By performing heavy encoding operations in advance and delivering pre-compressed streams, the system minimizes the computational requirements at the customer premises equipment while maintaining bandwidth efficiency.
3Speed
If GoP size is decreased to reduce channel change latency, then responsiveness is improved, but bandwidth consumption increases
Solution Approach 1:
The system dynamically adjusts GoP size based on detected channel change requests. When a channel change is detected, the GoP size is reduced to enable faster decoding and improve responsiveness. During periods without channel changes, the GoP size is increased to reduce bandwidth consumption. This dynamic adjustment resolves the contradiction by adapting the GoP size to current operational needs.
Solution Approach 2:
The GoP size parameter is changed from a fixed value to a variable that responds to channel change conditions. The system monitors for channel changes and modifies the GoP parameter accordingly, achieving both fast channel switching and efficient bandwidth utilization at different times.
Data Source
AI summary
Various methods, systems, and apparatuses can be used to adjust the group of pictures size for an encoder during encoding operations. In some implementations, group of pictures size can be reduced during periods of higher likelihood of channel change, and increased during periods of lower likelihood of channel change. Such adjustment can facilitate faster display of pictures after a channel change due to anchor frames being more quickly received.