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QT video write from images (cv::Mat) problem
RahibeMeryem last edited by
I am using thread and signal slot mechanism in my opencv object detection framework.
I decide to write frames as video (mp4 or mjpg) to a file.
I opened :
video = new VideoWriter; cv::VideoWriter video ("/data/outcpp.avi",CV_FOURCC('M','J','P','G'),25, Size(1280,720)); .. .. video->write(frame);
frame is coming from:
connect(worker , &Worker::frameChanged , recorder , &Vrecorder::recording);
it is creating file outcpp.avi and the size stuct at 4kb. It is not writing the video.
Same code is working as pure c++ without QT signal slot mechanism.
Any suggestion ?
Or any experince to write video from signalling with opencv or ffmpeg ?
Which one is preferable ?
You should show the complete code you are using. In what you posted, you seem to have some pointer to a VideoWriter, then a local
cv::VideoWriterwith the same name, then writing through the first object.