OpenCV合成视频
主要用到VideoCapture, VideoWriter
/* * Demo制作，将原始视频与该视频跟踪轨迹合并为一个视频。 * 用法：s键将将改合成帧加入到输出视频中 */#include#include #include #include #include using namespace std;using namespace cv;int main(){ const string originalFramePath = "/home/corfox/Data/GOPR/7"; // 原始视频帧路径 string originalFrameName; // 原始视频帧图像名 ostringstream numToStr; Mat originalFrame; // 原始视频帧图像 const int originalFrameNums = 1456; // 原始视频帧数目 int originalFrameWidth = 960; int originalFrameHeight = 540; const string mapVideo = "/home/corfox/Videos/7_25.mp4"; // 轨迹与地图视频 VideoCapture videoCapture; Mat mapFrame; videoCapture.open(mapVideo); if (!videoCapture.isOpened()) return 1; int mapFrameWidth = videoCapture.get(CV_CAP_PROP_FRAME_WIDTH); int mapFrameHeight = videoCapture.get(CV_CAP_PROP_FRAME_HEIGHT); const string mergeVideo = "/home/corfox/Videos/gopr7_25.avi"; // 合并后的视频 VideoWriter videoWriter; videoWriter.open(mergeVideo, CV_FOURCC('M', 'J', 'P', 'G'), 25, Size(mapFrameWidth + originalFrameWidth, mapFrameHeight + originalFrameHeight)); Mat mergeFrame; Rect roiLeft(0, 0, mapFrameWidth, mapFrameHeight); Rect roiRight(mapFrameWidth - 100, mapFrameHeight - 100, originalFrameWidth, originalFrameHeight); if (!videoWriter.isOpened()) return 1; int key = -1; int numCount = 1; while (1) { if (numCount < 10) { numToStr << originalFramePath << "/" << "frame0000" << numCount << ".jpg"; originalFrameName = numToStr.str(); } else if (numCount < 100) { numToStr << originalFramePath << "/" << "frame000" << numCount << ".jpg"; originalFrameName = numToStr.str(); } else if (numCount < 1000) { numToStr << originalFramePath << "/" << "frame00" << numCount << ".jpg"; originalFrameName = numToStr.str(); } else if (numCount < 10000) { numToStr << originalFramePath << "/" << "frame0" << numCount << ".jpg"; originalFrameName = numToStr.str(); } originalFrame = imread(originalFrameName, CV_LOAD_IMAGE_COLOR); originalFrameName.clear(); numToStr.str(""); numCount++; if (numCount > originalFrameNums) { break; } if (!videoCapture.read(mapFrame)) { break; } if (key == 115 || key == 83) // 's' or 'S' { mergeFrame = Mat(originalFrame.rows + mapFrame.rows, originalFrame.cols + mapFrame.cols, CV_8UC3, Scalar(255, 255, 255)); mapFrame.copyTo(mergeFrame(roiLeft)); originalFrame.copyTo(mergeFrame(roiRight)); videoWriter.write(mergeFrame); imshow("merge", mergeFrame); mergeFrame.release(); } imshow("map", mapFrame); imshow("original", originalFrame); key = waitKey(0); if (key == 27) break; } videoCapture.release(); videoWriter.release(); mapFrame.release(); originalFrame.release(); return 0;}