Extracting image from QMediaPlayer Video

问题

i am using Qt Creator to implement an application that reads a video and by clicking on a button i will save the frame that is being showed. Then i will process that frame with Opencv.

Having a video being displayed with QmediaPlayer, how can i extract a frame from the video? I should then be able to convert that frame to a Mat image in Matlab.

Thanks

回答1:

QMediaPlayer *player = new QMediaPlayer();
QVideoProbe *probe = new QVideoProbe;

connect(probe, SIGNAL(videoFrameProbed(QVideoFrame)), this, SLOT(processFrame(QVideoFrame)));

probe->setSource(player); // Returns true, hopefully.

processFrame slot:

void processFrame(QVideoFrame const&) {
  if (isButtonClicked == false) return;
  isButtonClicked = false;

  ...
  process frame
  ...

}

QVideoProbe reference

QVideoFrame reference

You can use QVideoFrame::bits() to process image with OpenCV

来源：https://stackoverflow.com/questions/35293893/extracting-image-from-qmediaplayer-video