python cv release_cv2.videoCapture.release（）是什么意思？

阴礼骞

2023-12-01

当您调用cap.release()时，则：发布软件资源

释放硬件资源

在调用cap.release()之前，可以尝试创建另一个实例cap2 = cv2.VideoCapture(0)。cap = cv2.VideoCapture(0)

#cap.release()

cap2 = cv2.VideoCapture(0)

因为您还没有释放相机设备资源，那么它将引发诸如Device or resource busy之类的错误，从而引发OpenCV异常。libv4l2: error setting pixformat: Device or resource busy

VIDEOIO ERROR: libv4l unable to ioctl S_FMT

libv4l2: error setting pixformat: Device or resource busy

libv4l1: error setting pixformat: Device or resource busy

VIDEOIO ERROR: libv4l unable to ioctl VIDIOCSPICT

libv4l2: error setting pixformat: Device or resource busy

OpenCV Error: Unspecified error (GStreamer: unable to start pipeline

) in cvCaptureFromCAM_GStreamer, file /home/xxx/Programs/OpenCV/src/opencv-master/modules/videoio/src/cap_gstreamer.cpp, line 887

VIDEOIO(cvCreateCapture_GStreamer(CV_CAP_GSTREAMER_V4L2, reinterpret_cast(index))): raised OpenCV exception:

/home/xxx/Programs/OpenCV/src/opencv-master/modules/videoio/src/cap_gstreamer.cpp:887: error: (-2) GStreamer: unable to start pipeline

in function cvCaptureFromCAM_GStreamer