Latency fix for RTSP-camera in console-app

AlexeyAB

2017-08-07 b202eaee259572cf8b627a776a62ce9d59aa50a6

Latency fix for RTSP-camera in console-app

 build/darknet/yolo_console_dll.vcxproj

@@ -117,6 +117,7 @@
      <SDLCheck>true</SDLCheck>
      <AdditionalIncludeDirectories>C:\opencv_3.0\opencv\build\include</AdditionalIncludeDirectories>
      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;_MBCS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <ExceptionHandling>Async</ExceptionHandling>
    </ClCompile>
    <Link>
      <EnableCOMDATFolding>true</EnableCOMDATFolding>

 src/yolo_console_dll.cpp

@@ -4,6 +4,7 @@
#include <vector>
#include <fstream>
#include <thread>
#include <atomic>

#define OPENCV

@@ -77,16 +78,19 @@
        try {
#ifdef OPENCV
            std::string const file_ext = filename.substr(filename.find_last_of(".") + 1);
            if (file_ext == "avi" || file_ext == "mp4" || file_ext == "mjpg" || file_ext == "mov") {    // video file
            std::string const protocol = filename.substr(0, 4);
            if (file_ext == "avi" || file_ext == "mp4" || file_ext == "mjpg" || file_ext == "mov" || protocol == "rtsp") {  // video file
                cv::Mat frame, prev_frame, det_frame;
                std::vector<bbox_t> result_vec, thread_result_vec;
                detector.nms = 0.02;    // comment it - if track_id is not required
                std::thread td([]() {});
                for (cv::VideoCapture cap(filename); cap >> frame, cap.isOpened();) {
                std::atomic<int> ready_flag = false;
                cv::VideoCapture cap(filename);
                for (; cap >> frame, cap.isOpened();) {
                    td.join();
                    result_vec = thread_result_vec;
                    det_frame = frame;
                    td = std::thread([&]() { thread_result_vec = detector.detect(det_frame, 0.2, true); });
                    td = std::thread([&]() { thread_result_vec = detector.detect(det_frame, 0.2, true); ready_flag = true; });

                    if (!prev_frame.empty()) {
                        result_vec = detector.tracking(result_vec); // comment it - if track_id is not required
@@ -94,6 +98,8 @@
                        show_result(result_vec, obj_names);
                    }
                    prev_frame = frame;
                    //if(protocol == "rtsp") while (!ready_flag) cap.grab();    // use if cam-fps 2x or more than dnn-fps
                    ready_flag = false;
                }
            }
            else if (file_ext == "txt") {   // list of image files