GoPro Hero4 Black C++ Streaming With OpenCV

gopro_streaming.cpp

#include <boost/exception/exception.hpp>
#include <boost/thread.hpp>
#include <boost/chrono.hpp>

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

using namespace cv;
using namespace std;


bool newFrame = false;
VideoCapture* cap;
Mat frame;
boost::mutex mtx;
boost::condition_variable cond;

void captureFunc()
{
    cap = new VideoCapture("udp://@10.5.5.9:8554");
    while (cap->isOpened())
    {
        boost::this_thread::sleep_for(boost::chrono::milliseconds(20));
        {
            boost::lock_guard<boost::mutex> lock(mtx);
            *cap >> frame;
            newFrame = true;
        }
        cond.notify_one();
    }
    return;
}

void sendToCB(const boost::system::error_code& ec)
{
    cerr << "Error " << ec.value() << endl;
}

void keepAlive()
{
    try
    {
        boost::asio::io_service ioService;
        boost::asio::ip::udp::resolver resolver(ioService);
        boost::asio::ip::udp::endpoint dest(boost::asio::ip::address::from_string("10.5.5.9"), 8554);
        boost::asio::ip::udp::socket sock(ioService, boost::asio::ip::udp::v4());

        for (;;)
        {
            boost::this_thread::sleep_for(boost::chrono::milliseconds(2000));
            sock.async_send_to(boost::asio::buffer("_GPHD_:0:0:2:0.000000\n", 22), dest,
                               boost::bind(&sendToCB, boost::asio::placeholders::error));
            cout << "Sent stay alive\n";
        }
    }
    catch (boost::exception& e)
    {
        cerr << "socket errored\n";
    }
}

int main(int argc, char** argv)
{
    namedWindow("frame");
    boost::thread capThread {captureFunc};
    boost::thread keepAliveThread {keepAlive};
    for (;;)
    {
        boost::unique_lock<boost::mutex> lock(mtx);
        while (!newFrame)
        {
            cond.wait(lock);
        }
        imshow("frame", frame);
        newFrame = false;
        if (27 == waitKey(10)) break; // the thread sleeps for longer
    }

    keepAliveThread.interrupt();
    cap->release();
    capThread.join();
    return 0;
}

How to receive json data from the camera. The camera info could be accessed through this url and the camera must be connected to the wifi http://10.5.5.9/gp/gpControl

Hi,

In case someone wanna find the similar code but in python-opencv, you may check this video tutorial with the code. Thanks.

hello,
the frame window is stuck in loading procedure and all grey. do you have an idea what the problem is ? i am using hero4 black firmware 5.0.

This is an ancient gist, compared to the speed of GoPro releases. I believe I wrote this code for either the Hero 3 or 4. If the code does not work for you, it most likely means that they've changed their interface.