Gst-dsexample plugin can't crop and extract detection

Please provide complete information as applicable to your setup.

• Hardware Platform (GPU)
• DeepStream Version 5.1.0
• JetPack Version (valid for Jetson only)
• TensorRT Version
• NVIDIA GPU Driver Version (465.19.01)
• Issue Type( questions, new requirements, bugs)
• How to reproduce the issue ? (This is for bugs. Including which sample app is using, the configuration files content, the command line used and other details for reproducing)
• Requirement details( This is for new requirement. Including the module name-for which plugin or for which sample application, the function description)

I was trying to implement the Gst-dsexample plugin to crop and extract the detection in each frame. I was following this post tutorial:

So basically in the get_converted_mat() method, the following code were added:

  // Use openCV to remove padding and convert RGBA to BGR. Can be skipped if
  // algorithm can handle padded RGBA data.
  in_mat =
      cv::Mat (dsexample->processing_height, dsexample->processing_width,
      CV_8UC4, dsexample->inter_buf->surfaceList[0].mappedAddr.addr[0],

  cv::cvtColor (in_mat, *dsexample->cvmat, cv::COLOR_RGBA2BGR);
  cv::cvtColor (in_mat, *dsexample->cvmat, CV_RGBA2BGR);

  std::string IMpath = "/home/img/";
  IMpath = IMpath + std::to_string(dsexample->frame_num) +"_new" + ".png";
  cv::imwrite(IMpath, *dsexample->cvmat);

But when I run the following pipeline, I always couldn’t get the cropped images in the predefined path, what’s wrong?

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If you have found anything wrong with deepstream, please tell us how to reproduce the problem.

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