Live Video Analytics on IoT Edge . Unable to use RSTP stream generated by webcam.

Question

I am generating an RSTP stream using a webcam using the following command.

cvlc v4l2:///dev/video0 --sout="#transcode{vcodec=h264}:rtp{mux=ts,sdp=rtsp://0.0.0.0:8080/cam.sdp}"

I have setup IOTEdge on Jetson Nano and running lvaEdge. I am following the example in the link.
https://learn.microsoft.com/en-us/azure/media-services/live-video-analytics-edge/detect-motion-record-video-clips-media-services-quickstart

I created the following Media Graph

{  
    "@apiVersion": "2.0",  
    "name": "EVRtoAssetsOnMotionDetection",  
    "properties": {  
      "description": "Event-based video recording to Assets based on motion events",  
      "parameters": [  
        {  
            "name": "rtspUserName",  
            "type": "String",  
            "description": "rtsp source user name.",  
            "default": "dummyUserName"  
        },  
        {  
            "name": "rtspPassword",  
            "type": "String",  
            "description": "rtsp source password.",  
            "default" : "dummyPassword"  
        },  
        {  
            "name": "rtspUrl",  
            "type": "String",  
            "description": "rtsp Url"  
        },  
        {  
            "name": "motionSensitivity",  
            "type": "String",  
            "description": "motion detection sensitivity",  
            "default" : "medium"  
        },  
        {  
            "name": "hubSinkOutputName",  
            "type": "String",  
            "description": "hub sink output name",  
            "default" : "iothubsinkoutput"  
        }                                
    ],           
  
      "sources": [  
        {  
          "@type": "#Microsoft.Media.MediaGraphRtspSource",  
          "name": "rtspSource",  
          "endpoint": {  
            "@type": "#Microsoft.Media.MediaGraphUnsecuredEndpoint",  
            "url": "${rtspUrl}",  
            "credentials": {  
              "@type": "#Microsoft.Media.MediaGraphUsernamePasswordCredentials",  
              "username": "${rtspUserName}",  
              "password": "${rtspPassword}"  
            }  
          }  
        }  
      ],  
      "processors": [  
        {  
          "@type": "#Microsoft.Media.MediaGraphMotionDetectionProcessor",  
          "name": "motionDetection",  
          "sensitivity": "${motionSensitivity}",  
          "inputs": [  
            {  
              "nodeName": "rtspSource"  
            }  
          ]  
        },  
        {  
          "@type": "#Microsoft.Media.MediaGraphSignalGateProcessor",  
          "name": "signalGateProcessor",  
          "inputs": [  
            {  
              "nodeName": "motionDetection"  
            },  
            {  
              "nodeName": "rtspSource"  
            }  
          ],  
          "activationEvaluationWindow": "PT1S",  
          "activationSignalOffset": "PT0S",  
          "minimumActivationTime": "PT30S",  
          "maximumActivationTime": "PT30S"  
        }  
      ],  
      "sinks": [  
        {  
          "@type": "#Microsoft.Media.MediaGraphAssetSink",  
          "name": "assetSink",  
          "assetNamePattern": "sampleAssetFromEVR-LVAEdge-${System.DateTime}",  
          "segmentLength": "PT0M30S",  
          "localMediaCacheMaximumSizeMiB": "2048",  
          "localMediaCachePath": "/var/lib/azuremediaservices/tmp/",  
          "inputs": [  
            {  
              "nodeName": "signalGateProcessor"  
            }  
          ]  
        },  
        {  
          "@type": "#Microsoft.Media.MediaGraphIoTHubMessageSink",  
          "name": "hubSink",  
          "hubOutputName": "${hubSinkOutputName}",  
          "inputs": [  
            {  
              "nodeName": "motionDetection"  
            }  
          ]  
        }  
      ]  
    }  
}  

and running an instance using the following.

{  
    "@apiVersion" : "2.0",  
    "name" : "Sample-Graph-2",  
    "properties" : {  
        "topologyName" : "EVRtoAssetsOnMotionDetection",  
        "description" : "Sample graph description",  
        "parameters" : [  
            { "name" : "rtspUrl", "value" : "rtsp://IP:8080/cam.sdp" }  
  
        ]  
    }  
}  

I keep getting this error

{  
  "body": {  
    "code": "459",  
    "target": "rtsp://IP:8080/cam.sdp",  
    "protocol": "rtsp"  
  },  
  "properties": {  
    "topic": "/subscriptions/subscription-id/resourceGroups/IOT_Product/providers/microsoft.media/mediaservices/vmedia",  
    "subject": "/graphInstances/Sample-Graph-2/sources/rtspSource",  
    "eventType": "Microsoft.Media.Graph.Diagnostics.ProtocolError",  
    "eventTime": "2021-02-01T23:59:42.887Z",  
    "dataVersion": "1.0"  
  },  
  "systemProperties": {  
    "iothub-connection-device-id": "Nano1",  
    "iothub-connection-module-id": "lvaEdge",  
    "iothub-connection-auth-method": "{\"scope\":\"module\",\"type\":\"sas\",\"issuer\":\"iothub\",\"acceptingIpFilterRule\":null}",  
    "iothub-connection-auth-generation-id": "auth id",  
    "iothub-enqueuedtime": 1612223982902,  
    "iothub-message-source": "Telemetry",  
    "messageId": "msg id",  
    "contentType": "application/json",  
    "contentEncoding": "utf-8"  
  }  
}  

The stream displays fine in VLC. I am unable to debug the issue.

Answer 1

@vikash ranjan

Checking the code of your error for the RTSP Protocol

459 - Aggregate operation not allowed
See more info about the error: https://tools.ietf.org/html/rfc2326#page-43

Based on these related threads in Stack Overflow:
https://stackoverflow.com/questions/9253721/whats-wrong-with-this-my-rtsp-methods-server-replies-459-always
https://stackoverflow.com/questions/20278472/rtsp-1-0-459-aggregate-operation-not-allowed

Please can you follow the suggestion and try setting up the RTP stream accordingly?

Thanks!