Opencv error on Gstreamer

[Akrita]

Hi 
I also developed this

cv::VideoCapture cap(0); 
std::string pipeline = "appsrc ! autovideoconvert ! omxh265enc ! matroskamux
! filesink    
    location=test.mkv ";
	cv::VideoWriter writer;
    writer.open(pipeline,0, (double)30, cv::Size(640, 480), true);
	 if (!writer.isOpened()) {
        printf("=ERR= can't create video writer\n");
        return -1;
    }
	if(cap.isOpened()){
	  cv::Mat frame;   
      while(1){
        cap >> frame;
        if (!frame.empty()){
		    cv::imshow( "Frame", frame );
			writer<<frame;
           char c=(char)cv::waitKey(40);
           if(c==27)
             break;
  
        }

but got this error!!!!!!!!
GStreamer Plugin: Embedded video playback halted; module appsrc0 reported:
Internal data flow error.

i dont really know what should i do <smiley
image="anim_confused.gif"/>

Regards,






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