Unable to to extract speed value from Deepstream

Accelerated Computing Intelligent Video Analytics DeepStream SDK
1

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU): GPU
• DeepStream Version5.1-21.02-devel
• JetPack Version (valid for Jetson only)
• TensorRT Version
• NVIDIA GPU Driver Version (valid for GPU only): 470.103.01
• Issue Type( questions, new requirements, bugs): Questions
• How to reproduce the issue? (This is for bugs. Including which sample app is used, 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’m using the combination of test5-app and the NVDS analytics app for extracting the metadata. I have successfully combined and generated the JSON structure with the values.

“analyticsModule” : {
“cam-source-id” : 0,
“description” : “Vehicle Detection and License Plate Recognition”,
“occupancy” : 1.0,
“Entry” : 2.0,
“Exit” : 0.0,
“source” : “OpenALR”,
“version” : “1.0”
},
“object” : {
“track-id” : “238”,
“speed” : 0.0,
“direction” : 0.0,
“orientation” : 0.0,
“person” : {
“age” : 0,
“gender” : “”,
“hair” : “”,
“cap” : “”,
“apparel” : “”,
“confidence” : 1.0
},
“bbox” : {
“topleftx” : 621,
“toplefty” : 399,
“bottomrightx” : 728,
“bottomrighty” : 511
},
“location” : {
“lat” : 0.0,
“lon” : 0.0,
“alt” : 0.0
},
“coordinate” : {
“x” : 0.0,
“y” : 0.0,
“z” : 0.0
}
},
“event” : {
“id” : “9f30f662-c841-4fda-9c08-ee2465961b3a”,
“type” : “entry”
},
“videoPath” : “”
}

The app works but does not send proper speed value. Only sending default “0”.
Where should I update so that I can get the proper speed value?

1 Like
3

where is speed value from? I can’t find it in deepstream sdk.

4

The default JSON structure of deepstream-test5 application has a variable name speed. By enabling Kafka if we run the application for vehicle detection and tracking, we receive the below JSON structure.

{
  "messageid" : "03484b05-b63c-4c3b-ac7b-ee13031de0ce",
  "mdsversion" : "1.0",
  "@timestamp" : "2023-04-30T06:31:55.274Z",
  "place" : {
    "id" : "0",
    "name" : "HWY_20_AND_LOCUST__EBA",
    "type" : "intersection/road",
    "location" : {
      "lat" : 30.32,
      "lon" : -40.549999999999997,
      "alt" : 100.0
    },
    "entrance" : {
      "name" : "C_127_158",
      "lane" : "Lane 1",
      "level" : "P1",
      "coordinate" : {
        "x" : 1.0,
        "y" : 2.0,
        "z" : 3.0
      }
    }
  },
  "sensor" : {
    "id" : "HWY_20_AND_LOCUST__EBA__4_11_2018_4_59_59_508_AM_UTC-07_00",
    "type" : "Camera",
    "description" : "Aisle Camera",
    "location" : {
      "lat" : 45.293701446999997,
      "lon" : -75.830391449900006,
      "alt" : 48.155747933800001
    },
    "coordinate" : {
      "x" : 5.2000000000000002,
      "y" : 10.1,
      "z" : 11.199999999999999
    }
  },
  "analyticsModule" : {
    "id" : "XYZ_1",
    "description" : "Vehicle Detection and License Plate Recognition",
    "source" : "OpenALR",
    "version" : "1.0"
  },
  "object" : {
    "id" : "558",
    **"speed" : 0.0**,
    "direction" : 0.0,
    "orientation" : 0.0,
    "Car" : {
    },
    "bbox" : {
      "topleftx" : 624,
      "toplefty" : 270,
      "bottomrightx" : 1104,
      "bottomrighty" : 708
    },
    "location" : {
      "lat" : 0.0,
      "lon" : 0.0,
      "alt" : 0.0
    },
    "coordinate" : {
      "x" : 0.0,
      "y" : 0.0,
      "z" : 0.0
    }
  },
  "event" : {
    "id" : "c455fd66-8ae5-4151-9526-6fbf4b53fc67",
    "type" : "entry"
  },
  "videoPath" : ""
}

I am assuming the speed variable inside analyticsModule/object should provide us with the tracked object speed. But currently, it is only sending hard-coded “0” values.
Let me know whether my assumption is wrong or if the function for calculating the speed is still not integrated inside the deepstream SDK?

1 Like
5

yes, please refer to generate_object_object in deepstream sdk, this speed value is set to hardcode zero.
there is no this speed information in analytics meta, please refer to NvDsAnalyticsObjInfo and NvDsAnalyticsFrameMeta in deepstream sdk.

6

@fanzh Thanks for the response.

Is there any way by which we can extract the previously tracked objects’ information(e.g. track_id, bbox, etc) in deepstream_test5_app_main.c?

7

you can get this information in NvDsObjectMeta, please refer to bbox_generated_probe_after_analytics for how to access NvDsObjectMeta.

8

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