C++ opencv保存mp4文件

C++ opencv保存mp4文件

cv::VideoWriter w_cap("re_video.mp4", VideoWriter::fourcc('m', 'p', '4', 'v'), rate, cv::Size(width, height));
// VideoWriter::fourcc('m', 'p', '4', 'v')中的mp4v都要小写才不会报错，操!