Video Transmission Controller for Low-Delay Applications
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Solution Overview
Problem
Existing video transmission systems struggle to achieve low-delay video transmission when the data transmission network is congested, particularly in applications requiring low latency, as they do not consider the application status and prioritize low-delay transmission inadequately.
Innovation Solution
A system that acquires the application status and dynamically selects an appropriate encoding and decoding scheme, as well as allocates network resources, to prioritize low-delay video transmission even during network congestion by using a controller to manage the video signal source, data transmission network, and video media converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If less-compressed or uncompressed encoding schemes are adopted to achieve low-delay video transmission, then video transmission delay is reduced, but bandwidth consumption increases
Solution Approach 1:
The encoding scheme is dynamically adjusted based on network conditions and application requirements. The system switches between uncompressed encoding (for low-delay requirements) and compressed encoding (for bandwidth efficiency) according to real-time status, making the encoding approach adaptive rather than static
Solution Approach 2:
The compression ratio parameter is changed based on application status. When low-delay transmission is required, the compression ratio is reduced (or set to zero for uncompressed). When bandwidth is constrained or delay is not critical, the compression ratio is increased to optimize resource usage
2Loss of time
If the size of the buffer on the receiver side is reduced to achieve low-delay video transmission, then video transmission delay is reduced, but the system requires a data transmission network with suppressed delay variation
Solution Approach 1:
The system performs preliminary classification of application status (low-delay required vs. delay-tolerant) before transmission. This allows the network to pre-allocate resources and apply appropriate QoS policies, ensuring delay stability is maintained where needed while enabling small buffer sizes for applications that require low delay
3Loss of time
If encoding bandwidth is increased to prioritize low-delay video transmission during network congestion, then low-delay transmission is achieved, but other applications that do not require low-delay transmission are adversely affected
Solution Approach 1:
Different quality levels of encoding are applied to different video flows based on their specific requirements. Low-delay applications receive uncompressed or low-compression encoding with higher bandwidth allocation, while delay-tolerant applications receive higher compression ratios. This local differentiation ensures each application gets the appropriate quality without unnecessarily consuming network resources
Solution Approach 2:
The encoding parameters (compression ratio, bitrate) are dynamically changed based on both network conditions and application status. The system identifies which applications require low-delay transmission and adjusts their encoding parameters accordingly, while maintaining different parameters for applications that can tolerate higher delay, thus optimizing overall network utilization
Data Source
AI summary
An object of the present disclosure is to enable low-delay video transmission in applications requiring video transmission with low delay even when the network is congested.The present disclosure relates to a device which acquires a status of an application using video transmission; selects an encoding scheme and a decoding scheme of a video signal generated by the application according to the status of the application; and secures resources of a data transmission network that transmits the video signal according to the selection result.