Qt或OpenCV:打印视频文件的编解码器 [英] Qt or OpenCV: print out the codec of a video file

问题描述

我想知道在使用VideoCapture(在OSX或Ubuntu上)打开视频文件后，如何打印出该视频文件的编解码器.

I'd like to know how i can print out the codec of a video file after opening it with VideoCapture (on OSX or Ubuntu).

该文件已由qt应用程序中的opencv正确加载并可视化.

The file is correctly loaded and visualized by opencv inside a qt application.

QString filename =  QFileDialog::getOpenFileName(...)
cout << filename.size() << endl; // size in byte
VideoCapture cap = VideoCapture(filename.toStdString());
cout << cap.get(CV_CAP_PROP_FRAME_HEIGHT) << endl; // print the height
cout << cap.get(CV_CAP_PROP_FPS) << endl; // print the fps

codec ??

推荐答案

尝试

cap.get(CV_CAP_PROP_FOURCC);

获取编解码器.

修改:我不是C ++程序员，但这是我发现在四处搜索以将其更改为char数组的结果:

I am not a C++ programmer, but this is what I found searching around to change it to a char array:

int ex = static_cast<int>(inputVideo.get(CV_CAP_PROP_FOURCC));
char EXT[] = {ex & 0XFF , (ex & 0XFF00) >> 8,(ex & 0XFF0000) >> 16,(ex & 0XFF000000) >> 24, 0};

请参阅: http://docs.opencv.org/doc/tutorials/highgui/video-write/video-write.html

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