Video Switching Control for Encoding Buffer Management
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Solution Overview
Problem
Conventional video switching devices experience image quality degradation during encoding due to increased data generation and reduced buffer capacity during transitions, leading to omitted details and poor image reproducibility.
Innovation Solution
A video switching device with a control unit that reduces the amount of code generated by the encoding unit during high-level pre-control signal periods by adjusting quantization levels and switching video signals during vertical blanking intervals, ensuring efficient allocation of data and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If video switching is performed during normal encoding operation, then video signal switching is achieved, but image quality degrades due to increased data generation and reduced buffer capacity
Solution Approach 1:
The control detection unit detects the vertical blanking interval in advance before the actual video switching occurs. The control unit then reduces the amount of code generated by the encoding unit during this preliminary period, preparing the buffer memory unit with sufficient capacity before the switching event. This preliminary action prevents image quality degradation by ensuring buffer capacity is adequate when switching occurs.
Solution Approach 2:
The control unit dynamically changes the encoding parameters by reducing the amount of code generated during the vertical blanking interval. This parameter change is timed to occur before video switching, allowing the buffer memory unit to accumulate sufficient capacity to handle the increased data generation that occurs during switching, thereby maintaining image quality.
2Reliability
If the amount of code is reduced during pre-control signal periods, then buffer capacity is maintained, but encoding efficiency may be affected
Solution Approach 1:
The control detection unit detects periodic vertical blanking intervals that occur regularly during video signal transmission. The control unit reduces code generation amount only during these specific periodic intervals rather than continuously, allowing encoding to proceed at normal efficiency during non-blanking periods while maintaining buffer capacity during switching events.
Data Source
AI summary
A video switching device includes a video switching unit that has at least two video signal input units, and an encoding device. The video switching unit includes a first control detection unit that, on the basis of an externally inputted control signal, outputs a pre-control signal; a second control detection signal that, on the basis of the control signal, outputs a camera switching instruction signal for switching camera video signals during a vertical blanking interval; and a camera video switching unit that switches two video signals. The encoding device includes an encoding unit that encodes video signals; and a control unit that, by means of the pre-control signal, reduces the amount of code generated by the encoding unit.