How to Eliminate VideoCapture Lag in OpenCV?

VideoCapture Lag Mitigation

VideoCapture in OpenCV utilizes a buffer to store captured frames. While this buffer enhances performance, it can lead to lag if not properly handled.

OpenCV Solution

For specific hardware configurations, OpenCV offers the CV_CAP_PROP_BUFFERSIZE property. By setting this property, you can control the buffer size, reducing the accumulation of old frames.

Hackaround 1: Frame Timing Analysis

This hackaround monitors the time taken to retrieve a frame. If the time is significantly short, the frame is assumed to be from the buffer and discarded. Once the time exceeds a certain threshold, the returned frame is considered up-to-date.

Hackaround 2: Continuous Frame Retrieval Thread

To prevent buffer accumulation, a dedicated thread can continuously retrieve frames using grab() at high speed. When the main worker thread needs a frame, it can grab it from this buffer thread using a synchronization mechanism like a spin-lock.

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