Error: gstDsExample has no property named 'nvbuf-memory- type' and Gst_dsexample_transform_ip:NEED NVBUF_MEM_CUDA_UNIFIED memory for opencv blurring

Accelerated Computing Intelligent Video Analytics DeepStream SDK
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  • deepstream-app version 6.1.0
  • DeepStreamSDK 6.1.0
  • CUDA Driver Version: 11.4
  • CUDA Runtime Version: 11.0
  • TensorRT Version: 8.2
  • cuDNN Version: 8.4
  • libNVWarp360 Version: 2.0.1d3
  • on A6000

1，I based on deepstream-test3, modified the source code, created the dsexample plugin with gst_element_factory_make and then added it to the pipeline, and it reported an error: gstDsExample has no property named ‘nvbuf-memory- type’ and Gst_dsexample_transform_ip:NEED NVBUF_MEM_CUDA_UNIFIED memory for opencv blurring.
2，But in deepsteam-app modify the configuration file, add ds-example can run, I analyzed the deepstream-app source code, found that he used create_dsexample_bin, in this function set nvbuf-memory-type separately.
3，I am modifying the source code, I can’t use deepstream-app, so I create dsexample plugin in the source code by gst_element_factory_make, what should I write in?

...
GstElement *osd = deepstream_test1_app_add_nvdsosd (pipeline, pgie, 0, 0, "OSD");
GstElement *dsexample = gst_element_factory_make ("dsexample", "dsexample");
g_object_set (G_OBJECT (dsexample), "full-frame", 0, "processing-width", 640, "processing-height", 480, "batch-size", 1, "unique-id", 15, "gpu-id", 0, "blur-objects", 1, "nvbuf-memory-type", 3, "roi-top-offset", 0, "roi-left-offset", 0, "roi-width", 640, "roi-height", 480, NULL);
gst_bin_add (GST_BIN (pipeline), dsexample);
gst_element_link (osd, dsexample);
...
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gstDsExample is opensource, there is no nvbuf-memory- type property, the path is: opt\nvidia\deepstream\deepstream\sources\gst-plugins\gst-dsexample\gstdsexample.cpp

here is a deepstream native sample: /opt/nvidia/deepstream/deepstream/sources/apps/sample_apps/deepstream-opencv-test

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opt\nvidia\deepstream\deepstream\sources\gst-plugins\gst-dsexample\gstdsexample.cpp

  /* Initialize all property variables to default values */
  dsexample->unique_id = DEFAULT_UNIQUE_ID;
  dsexample->processing_width = DEFAULT_PROCESSING_WIDTH;
  dsexample->processing_height = DEFAULT_PROCESSING_HEIGHT;
  dsexample->process_full_frame = DEFAULT_PROCESS_FULL_FRAME;
  dsexample->blur_objects = DEFAULT_BLUR_OBJECTS;
  dsexample->process_mapping = DEFAULT_PROCESS_MAP_OBJECTS;
  dsexample->gpu_id = DEFAULT_GPU_ID;
  /* This quark is required to identify NvDsMeta when iterating through
   * the buffer metadatas */
  if (!_dsmeta_quark)
    _dsmeta_quark = g_quark_from_static_string (NVDS_META_STRING);
}

From the opensource code, there is indeed no nvbuf-memory- type attribute.

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Can I add the dsexample directly after the osd plugin? Or do I have to add the convert plugin?

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yes, dsexample is only a sample plugin. no.

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1,I have to set up the conv plugin before example and set the nvbuf-memory-type of the conv plugin to 1 , so that it can be enabled.
2,But I found out that if I have multiple input sources, dsexample only processes the image after the overall tiler, instead of cycling through the different input sources, right?
3,How to do it?

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  1. yes, tiler plugin will output Gst Buffer (single frame) with composited input frames, please refer to Gst-nvmultistreamtiler — DeepStream 6.2 Release documentation.
  2. you can add dsexample before tiler plugin example, please refer to sample deepstream-opencv-test

There is no update from you for a period, assuming this is not an issue any more.
Hence we are closing this topic. If need further support, please open a new one.
Thanks

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