[小程序系列] C++ Opencv 视频格式转换
- 引言
- 代码
- 参考文献
引言
小项目需求，需要对大一点的视频做格式转换，用一个小程序实现。
代码
执行文件 test.cpp。
#include <opencv2/core.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/highgui.hpp>
#include <iostream>
#include <stdio.h>
int main(int argc, char ** argv){
if (argc != 3) {
std::cerr << "usage: main <param for camera and write file path>\n";
return -1;
}
cv::VideoCapture video_cap(0);// default open camera
if (std::string(argv[1]) != "0"){
video_cap = cv::VideoCapture(argv[1]);
}
if (!video_cap.isOpened()) {
std::cerr << "Unable to open video, Please enter the correct video path! \n";
return -1;
}
std::cout << "video frame FPS: " << video_cap.get(cv::CAP_PROP_FPS) << std::endl;
std::cout << "video frame width: " << video_cap.get(cv::CAP_PROP_FRAME_WIDTH) << std::endl;
std::cout << "video frame height: " << video_cap.get(cv::CAP_PROP_FRAME_HEIGHT) << std::endl;
cv::Mat video_image; // define video image
video_cap >> video_image;
if (video_image.empty()) {
std::cerr << "blank frame grabbed!\n";
return -1;
}
bool is_color = (video_image.type() == CV_8UC3);
cv::VideoWriter writer;
double video_fps = 15.0;
if (video_cap.get(cv::CAP_PROP_FPS) > 0) {
video_fps = video_cap.get(cv::CAP_PROP_FPS);
}
int codec = cv::VideoWriter::fourcc('X', 'V', 'I', 'D');
writer.open(argv[2], codec, video_fps, video_image.size(), is_color);
if (!writer.isOpened()) {
std::cerr << "Could not open the output video file for write ！\n";
return -1;
}
for (;;){
if (!video_cap.read(video_image)) {
std::cerr << " blank frame grabbed\n";
break;
}
writer.write(video_image);
cv::imshow("video_image", video_image);
if (cv::waitKey(5) >= 0)
break;
}
return 1;
}
参考文献
感谢各位大佬的分享
jackwangcumt–OpenCV C++简单的视频读取和保存
胵恦–OpenCV初尝试
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