Encode YUV420 buffer with appsrc

[pchaurasia]

Thanks for helping out BabyOctopus. After following your suggestion - I am
still not able to get the format right.  Following is my code, this code is
generating a legal mkv bitstream but content is all junk. It seems there is
some issue in what I am feeding to encoder 




    GstVideoInfo info;
    GstElement *appsrc;
    GstElement *pipeline;
    GstCaps *caps;

    string aaDebugPipeline          = "appsrc name=myappsrc !
autovideoconvert ! omxh265enc ! matroskamux ! filesink location=test.mkv ";    
    pipeline                        =
gst_parse_launch(aaDebugPipeline.c_str(),NULL);
    g_assert (pipeline);

    appsrc                          = gst_bin_get_by_name
(GST_BIN(pipeline), "myappsrc");
    g_assert (appsrc);

    gst_video_info_set_format(&info, GST_VIDEO_FORMAT_I420, 1920, 1080);
    caps                            = gst_video_info_to_caps(&info); 
    gst_app_src_set_caps(GST_APP_SRC(appsrc), caps);


   m_videoWriter.open(aaDebugPipeline,0, (double)30, cv::Size(1920, 1080),
false);
   if (!m_videoWriter.isOpened()) {
      REPORT_ERROR("can't create writer\n");
      exit(1);
   }


// THis is how I am calling m_videoWriter -

       cv::Mat imgY = cv::Mat(1080 ,1920, CV_8UC1, framedata.dataY,2048);
       cv::Mat imgU = cv::Mat(540 ,960, CV_8UC1, framedata.dataU,1024);
       cv::Mat imgV = cv::Mat(540 ,960, CV_8UC1, framedata.dataV,1024);

       m_videoWriter.write(imgY);  

// I am able to successfully imshow (imgY)

Thanks





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