CODEWITHSUNDEEP
c++opencvwebcamwebcam-capture
Ahx
Ahx

Reputation: 8005

OpenCV Creating Video From Text File

I am trying to build an application, which get data from webcam or external device, saves Video Frames into text file, then read frames from created text file.

I don't know whether it is a good idea to save to text file, I'm open suggestions.

So far I've done to saving to a text file.

My problem is reading from text file. Basically I read text line by line, but I don't know how to convert this text into Mat object.

So far my code is:

ifstream read_storage(new_vid_frm_path);
if(!read_storage.is_open()) {
    perror("\n\n\n\t\t\t(-)FAIL : Can't Open SavedVideoFrames.txt\n\n\n\t\t\t");
    return -1;
}

VideoWriter *vid = new VideoWriter(new_vid_frm_path,CV_FOURCC('P', 'I', 'M', '1'),30,Size(vc.get(CV_CAP_PROP_FRAME_WIDTH),vc.get(CV_CAP_PROP_FRAME_HEIGHT)));
Mat line;
vector<Mat> vid_frms;
while ( getline (read_storage,line) ) {
    cout << line << '\n';

}

read_storage.close();

if(vid_frms.size() == 0){
    printf("\n\n\n\t\t\t(-)FAIL: Error In Frame\n\n\n\t\t\t");
    return -1;
}

for(size_t i = 0; i<vid_frms.size(); i++)
    (*vid).write(vid_frms[i]);

printf("\n\n\n\t\t\t(+)SUCCESS: Video Processing Complete \n\n\n\t\t\t ");

Do you have ay suggestions how can I cast or convert this line string to Mat obejct?

while ( getline (read_storage,line) ) {
    cout << line << '\n';

}

Thanks.

By the way, I looked at this solution, but I couldn't understand. Convert a string of bytes to cv::mat

I couldn't find the byte type in c++ and I think there might be a direct conversion between String to Mat object.

Upvotes: 0

Views: 308

Answers (1)

Jeremy Gamet
Jeremy Gamet

Reputation: 165

You can save anything (just about) in OpenCV to a .xml or .yml text file and then read it back in using the OpenCV XML/YAML FileStorage methods.

I highly recomend this over using native C++ methods for file stuff.

It's specifically designed to handle all this legwork for you.

Upvotes: 2

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