Jetson TX2（3）opencv3 打开usb摄像头

ubuntu2604

opencv3.4.0

https://blog.csdn.net/ultimate1212/article/details/80936175?utm_source=blogxgwz7

cmake_minimum_required(VERSION 2.8)

project(DisplayImage)  

set( CMAKE_CXX_FLAGS "-std=c++11 -O3" )

find_package( OpenCV REQUIRED )

#if(CMAKE_VERSION VERSION_LESS "2.8.11")

  # Add OpenCV headers location to your include paths

  include_directories(

  include

  ${OpenCV_INCLUDE_DIRS}

   )

#endif()

#单个包添加

#add_executable( DisplayImage src/DisplayImage.cpp )  

#文件路径自动读取添加

AUX_SOURCE_DIRECTORY(./src DIR_SRCS)

ADD_EXECUTABLE(DisplayImage ${DIR_SRCS})

target_link_libraries( DisplayImage ${OpenCV_LIBS} )

#设置可执行文件的输出目录

SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/bin)

Jetson TX2（3）opencv3 打开usb摄像头

#include <iostream>

#include <opencv2/opencv.hpp>

#include <string>

using namespace cv;

using namespace std;

int main()

{

    VideoCapture capture(0);

    if(capture.isOpened())

    {

        cout<<"success"<<endl;

    }

    Mat frame;

    while (capture.isOpened())

    {

        capture >> frame;

        imshow("capture", frame);

        char key = static_cast<char>(cvWaitKey(10));//控制视频流的帧率，10ms一帧

        if (key == 27)  //按esc退出

            break;

    }

    return 0;

}

　　报错问题

https://blog.csdn.net/dhaduce/article/details/80379792

笔者在进行测试时，出现如下错误：

libv4l2: error setting pixformat: Invalid argument
libv4l2: error setting pixformat: Invalid argument
libv4l2: error setting pixformat: Invalid argument
libv4l2: error setting pixformat: Invalid argument
VIDEOIO ERROR: V4L2: Pixel format of incoming image is unsupported by OpenCV
Couldn't connect to webcam.

OPENCV默认采用0号摄像头，TX2的0号摄像头是板子上自带的板上摄像头，而我们的usb摄像头是1号，故笔者使用如下代码，解决了问题

如果上述方法不能解决问题，可以尝试如下操作：

首先检查是否安装了v4l1compat.so

dpkg -S v4l1compat.so

　　若没有安装，则安装；若找到该文件，则跳过安装，进行下一步

apt-cache search libv4l

sudo apt-get install libv4l-ruby1.8

　　然后添加环境变量

export LD_PRELOAD=/usr/lib/aarch64-linux-gnueabihf/libv4l/v4l1compat.so

export LD_PRELOAD=/usr/lib/aarch64-linux-gnueabihf/libv4l/v4l2convert.so

sudo ldconfig

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Jetson TX2（3）opencv3 打开usb摄像头

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