OpenCV加载视频

一、加载视频

	//视频路径QString appPath = QCoreApplication::applicationDirPath();QString videoPath = appPath + "/vtest.avi";cv::VideoCapture capture;capture.open(videoPath.toStdString(),CAP_FFMPEG);//从摄像头读取//capture.open(0, CAP_DSHOW);cv::Mat frame;while (true) {//读帧bool ret = capture.read(frame);if (!ret)break;imshow("frame", frame);//添加帧处理 等待 100 毫秒，检查用户是否按下键盘上的按键char c = waitKey(100);//按下的是 ESC 键 (ASCII 值为 27)，则跳出循环，停止播放视频if (c == 27)break;}waitKey(0);destroyAllWindows();

二、获取视频属性

	//视频路径QString appPath = QCoreApplication::applicationDirPath();QString videoPath = appPath + "/vtest.avi";cv::VideoCapture capture;capture.open(videoPath.toStdString(),CAP_FFMPEG);qDebug() << u8"高：" << capture.get(CAP_PROP_FRAME_HEIGHT);qDebug() << u8"宽：" << capture.get(CAP_PROP_FRAME_WIDTH);qDebug() << u8"帧率FPS：" << QString::number(capture.get(CAP_PROP_FPS));qDebug() << u8"总帧率：" << capture.get(CAP_PROP_FRAME_COUNT);

三、保存视频

	//视频路径QString appPath = QCoreApplication::applicationDirPath();QString videoPath = appPath + "/vtest.avi";cv::VideoCapture capture;capture.open(videoPath.toStdString(), CAP_FFMPEG);qDebug() << u8"高：" << capture.get(CAP_PROP_FRAME_HEIGHT);qDebug() << u8"宽：" << capture.get(CAP_PROP_FRAME_WIDTH);qDebug() << u8"帧率FPS：" << capture.get(CAP_PROP_FPS);qDebug() << u8"总帧率：" << capture.get(CAP_PROP_FRAME_COUNT);//保存视频路径QString savevideoPath = appPath + "/output.avi";cv::VideoWriter writer(savevideoPath.toStdString(), capture.get(CAP_PROP_FOURCC), capture.get(CAP_PROP_FPS), Size(capture.get(CAP_PROP_FRAME_WIDTH), capture.get(CAP_PROP_FRAME_HEIGHT)));cv::Mat frame;while (true) {//读帧bool ret = capture.read(frame);if (!ret)break;imshow("frame", frame);//添加帧处理 writer.write(frame);//等待 100 毫秒，检查用户是否按下键盘上的按键char c = waitKey(100);//按下的是 ESC 键 (ASCII 值为 27)，则跳出循环，停止播放视频if (c == 27)break;}capture.release();writer.release();waitKey(0);destroyAllWindows();