[人工智能]VideoCapture打开视频失败

前几天安装的OpenCV《小白-《学习OpenCV3》-安装OpenCV》在读取视频的时候一直打开视频文件失败。折腾了一下，发现是在进行配置的时候找不到ffmpeg。
需要在安装依赖的时候多安装几个（不知道具体是缺失哪个依赖导致的问题）：

sudo apt-get install libgtk-dev -y
sudo apt-get install build-essential git cmake pkg-config -y
sudo apt-get install libpng-dev -y
sudo apt-get install libjpeg-dev -y
sudo apt-get install libtiff-dev -y
sudo apt-get install libjasper-dev -y
sudo pip3 install numpy
sudo apt-get install libqtgui4 libqtwebkit4 libqt4-test
sudo apt-get install libhdf5-dev libhdf5-serial-dev libhdf5-103
sudo apt-get install libatlas-base-dev gfortran
sudo apt-get install libgtk2.0-dev libgtk-3-dev
sudo apt-get install libgdk-pixbuf2.0-dev libpango1.0-dev
sudo apt-get install libxvidcore-dev libx264-dev
sudo apt-get install libfontconfig1-dev libcairo2-dev
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev -y

cmake配置时，ffmpeg应该会显示YES

opencv.pc需要去掉几个链接库：

prefix=/usr/local
exec_prefix=${prefix}
includedir=${prefix}/include
libdir=${exec_prefix}/lib

Name: opencv
Description: The opencv library
Version:4.5.3
Cflags: -I${includedir}/opencv4
Libs: -L${libdir}  -lopencv_stitching -lopencv_objdetect -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_video -lopencv_photo -lopencv_ml -lopencv_imgproc -lopencv_flann  -lopencv_core
~   

有些版本可能在安装过程中会报错，这里给出安装的源码压缩包：
opencv：https://download.csdn.net/download/y1757655788/20666510
opencv_contrib:https://download.csdn.net/download/y1757655788/20666517

example.cpp:

#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"

int main(int argc, char **argv)
{
    cv::namedWindow("example",cv::WINDOW_AUTOSIZE);
    cv::VideoCapture cap;
    cap.open(std::string(argv[1]));
    cv::Mat frame;
    while(1)
    {
        cap >> frame;
        if(frame.empty())
        {
            printf("frame is empty!\r\n");
            break;
        }
        cv::imshow("example",frame);
        if(cv::waitKey(33)>=0) break;
    }

}

编译之后运行