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Learn how to set up a real‑time webcam stream in OpenCV 4.x with GStreamer, verify the build, build a pipeline, display frames, measure FPS, and recover from common pitfalls.
Learn how to plug a hardware‑accelerated GStreamer pipeline into OpenCV’s VideoCapture to boost frame rates and reduce CPU load on supported platforms.
Goal Request a specific frame resolution through VideoCapture::set(CAP_PROP_FRAME_WIDTH, ...) and CAP_PROP_FRAME_HEIGHT on Linux, then verify that the captured frames match the requested dimensions. Constraints and uncertainty The OpenCV documentation does not guarantee that the requested width and height are honored. On V4L2 the driver may ignore the proper