Opencv error on Gstreamer

[Akrita]

Hi
i develop this code on jetson tk1 and UBUNTU 14.04

  cv::VideoCapture cap(0);
  std::string pipeline = "appsrc !
video/x-raw,width=640,height=480,format=(string)YUY2 ! videoconvert  !     
  omxh264enc ! matroskamux ! filesink location=test.mp4 ";
  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;
            }
       } 
  }
	cap.release();
	

 but i got these error 
 Inside NvxLiteH264DecoderLowLatencyInitNvxLiteH264DecoderLowLatencyInit set
DPB and  
  MjstreamingGStremer plugin:Embedded video playback halted;module appsrc0
reported:Internal Data flow
  error.

 Best Regards
 Akrita

    




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