WebAssembly:编译OpenCV C+时未定义的符号_ZN2cv12VideoCaptureC1Ev+；代码 我试图编译我的C++代码，它使用视频捕捉到WASM，基本上我试图在浏览器中显示RTSP、RTMP相机的帧，而不使用媒体服务器。以下是编译OpenCV for emscripten时启用的构建模块 cmd = ["cmake", "-DCMAKE_BUILD_TYPE=Release", "-DCMAKE_TOOLCHAIN_FILE='%s'" % self.get_toolchain_file(), "-DCPU_BASELINE=''", "-DCPU_DISPATCH=''", "-DCV_TRACE=OFF", "-DBUILD_SHARED_LIBS=OFF", "-DWITH_1394=OFF", "-DWITH_ADE=OFF", "-DWITH_VTK=OFF", "-DWITH_EIGEN=OFF", "-DWITH_FFMPEG=ON", "-DWITH_GSTREAMER=ON", "-DWITH_GTK=ON", "-DWITH_GTK_2_X=ON", "-DWITH_IPP=OFF", "-DWITH_JASPER=OFF", "-DWITH_JPEG=ON", "-DWITH_WEBP=OFF", "-DWITH_OPENEXR=OFF", "-DWITH_OPENGL=OFF", "-DWITH_OPENVX=OFF", "-DWITH_OPENNI=OFF", "-DWITH_OPENNI2=OFF", "-DWITH_PNG=ON", "-DWITH_TBB=OFF", "-DWITH_PTHREADS_PF=OFF", "-DWITH_TIFF=ON", "-DWITH_V4L=ON", "-DWITH_OPENCL=ON", "-DWITH_OPENCL_SVM=ON", "-DWITH_OPENCLAMDFFT=ON", "-DWITH_OPENCLAMDBLAS=ON", "-DWITH_GPHOTO2=ON", "-DWITH_LAPACK=ON", "-DWITH_ITT=ON", "-DWITH_QUIRC=ON", "-DBUILD_ZLIB=ON", "-DBUILD_opencv_apps=ON", "-DBUILD_opencv_calib3d=ON", "-DBUILD_opencv_dnn=ON", "-DBUILD_opencv_features2d=ON", "-DBUILD_opencv_flann=ON", # No bindings provided. This module is used as a dependency for other modules. "-DBUILD_opencv_gapi=ON", "-DBUILD_opencv_ml=ON", "-DBUILD_opencv_photo=ON", "-DBUILD_opencv_imgcodecs=ON", "-DBUILD_opencv_shape=ON", "-DBUILD_opencv_videoio=ON", "-DBUILD_opencv_videostab=ON", "-DBUILD_opencv_highgui=ON", "-DBUILD_opencv_superres=ON", "-DBUILD_opencv_stitching=ON", "-DBUILD_opencv_java=OFF", "-DBUILD_opencv_java_bindings_generator=OFF", "-DBUILD_opencv_js=ON", "-DBUILD_opencv_python2=OFF", "-DBUILD_opencv_python3=OFF", "-DBUILD_opencv_python_bindings_generator=OFF", "-DBUILD_EXAMPLES=OFF", "-DBUILD_PACKAGE=OFF", "-DBUILD_TESTS=OFF", "-DBUILD_PERF_TESTS=OFF"]

我收到的错误消息是

错误：未定义符号：\ ZN2cv12VideoCaptureC1Ev警告：要禁用 未定义符号的错误使用

-s ERROR\u ON\u undefined\u symbols=0

错误：未定义的符号：_ZN2cv12VideoCaptureD1Ev

这是我的C++代码：

#include <emscripten/bind.h>
#include <emscripten/val.h>
#include <opencv2/core/mat.hpp>
#include <opencv2/imgcodecs.hpp>
#include <opencv2/opencv.hpp>
#include <opencv2/objdetect.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/videoio.hpp>
#include <iostream>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
using namespace cv;
using namespace emscripten;
class Hello {
private:
std::vector<unsigned char> buffer;
Mat decoded;
cv::VideoCapture capture;
public:
Hello() : buffer{}, decoded{} {};
val allocate(size_t size) {
this->buffer.reserve(size);
unsigned char *byteBuffer = this->buffer.data();
return val(typed_memory_view(size, byteBuffer));
}
bool init(String s){
capture = cv::VideoCapture(s);
capture.set(CAP_PROP_BUFFERSIZE, 1);
// capture.set(CV_CAP_PROP_BUFFERSIZE, 1);
// capture.set(CV_CAP_PROP_FRAME_WIDTH,1280);
// capture.set(CV_CAP_PROP_FRAME_HEIGHT,720);
// capture.set(cv::CAP_PROP_FPS,60);
//capture.set(CV_CAP_PROP_FRAME_HEIGHT,768);
return capture.isOpened();
}
cv::Mat getFrame(){
cv::Mat frame;
if (!capture.read(frame)) {
return frame;
}
return frame;
}
Mat my_imdecode() {
// this->decoded = cv::imdecode(this->buffer, IMREAD_GRAYSCALE);
return this->decoded;
}
};
EMSCRIPTEN_BINDINGS(my_module) {
class_<Mat>("Mat");
class_<Hello>("Hello")
.constructor<>()
.function("imdecode", &Hello::my_imdecode)
.function("allocate", &Hello::allocate)
.function("init", &Hello::allocate).
.function("getFrame", &Hello::allocate);
}

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使用名称空间cv；
使用名称空间emscripten；
同学们好{
私人：
向量缓冲区；
Mat解码；
视频捕获；
公众：
Hello（）：缓冲区{}，解码{}{}；
val分配（大小）{
此->缓冲区保留（大小）；
unsigned char*byteBuffer=this->buffer.data（）；
返回值（键入的内存视图（大小，字节缓冲））；
}
bool init（字符串s）{
捕获=cv:：视频捕获；
捕获设置（CAP_PROP_BUFFERSIZE，1）；
//捕获设置（CV\U CAP\U PROP\U BUFFERSIZE，1）；
//捕获设置（CV\U CAP\U PROP\U FRAME\U WITH，1280）；
//拍摄设置（CV、帽子、道具、框架、高度720）；
//捕获集（cv:：CAP_PROP_FPS，60）；
//捕获设置（CV、CAP、PROP、框架、高度，768）；
返回capture.isopend（）；
}
cv:：Mat getFrame（）{
cv：：垫架；
如果（！捕获.读取（帧））{
返回框；
}
返回框；
}
Mat my_imdecode（）{
//this->decoded=cv:：imdecode（this->buffer，IMREAD\u灰度）；
返回此->已解码；
}
};
EMSCRIPTEN_绑定（我的_模块）{
类别("Mat");；
班级("你好")
.constructor（）
.function（“imdecode”，&Hello:：my_imdecode）
.function（“分配”、&Hello:：分配）
.function（“init”，&Hello:：allocate）。
.function（“getFrame”和&Hello:：allocate）；
}

我知道我的代码是正确的，我犯的唯一错误是编译OpenCV，那么我应该编译哪些模块呢