How to consume radar metadata using ACAP application on Axis Q1656-DLE radar video fusion camera

[gahangandi11]

Hi, I have built an ACAP application following the steps in the github page here

https://github.com/AxisCommunications/acap-native-sdk-examples/tree/main/message-broker/consume-scene-metadata

I have built and uploaded the eap file and when i see the logs i find something like this

I do not see any metadata from radar like speed and distance here . So I have have changed the source number to 2 in the consume_scene_metadata.c file like below, hoping source="2" would give metadata from radar...

channel_identifier_t channel_identifier    = {.topic =
                                                  "com.axis.analytics_scene_description.v0.beta",
                                              .source = "2"}; 
                                              
I built the application again and uploaded it but this time i do not see any data in the logs. This is what i see

please help me how to build the ACAP application to consume metadata from the radar channel usin axis Q1656 DLE.

I am using axis os 12.2.52

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[Cacsjep]

As you can see in the json example payload description for Scene Data there is nothing about radar speed or distance. I would use metadata monitor and See what Events are send eg produced. And use axevent to subsricbe to them

[Cacsjep]

If you have more question come Here https://discord.gg/jrE98E6Qe9

[Cacsjep]

Just for reference, an example how to consume radar metadatastream via python,
could also be used for standart metadata stream (just modify url)

import av

def extract_and_parse_metadata(rtsp_url):
    """
    Connect to an RTSP stream over TCP, extract XML metadata, and handle potential issues.
    """
    try:
        # Open the RTSP stream with TCP transport
        container = av.open(rtsp_url, 'r', options={'rtsp_transport': 'tcp'})

        # Select the data stream
        if not container.streams.data:
            print("No data stream found in the RTSP container.")
            return
        
        data_stream = container.streams.data[0]
        print(f"Data stream opened: {data_stream}")

        for packet in container.demux(data_stream):
            try:
                # Decode the packet to an XML string
                xml_string = packet.to_bytes().decode('utf-8')
                print("Extracted XML Metadata:")
                print(xml_string)
            except UnicodeDecodeError:
                print("Warning: Failed to decode packet as UTF-8. Skipping this packet.")
            except Exception as e:
                print(f"Error processing packet: {e}")
    except av.AVError as e:
        print(f"Error reading RTSP stream: {e}")
    except Exception as e:
        print(f"An unexpected error occurred: {e}")
    finally:
        print("Processing completed.")

if __name__ == "__main__":
    # Replace with your data
    user = "root"
    password = "blabla"
    ip = "195.60.68.14"
    rtsp_port = 554
    rtsp_url = f"rtsp://{user}:{password}@{ip}:{rtsp_port}/axis-media/media.amp?camera=2&video=0&audio=0&event=on&analytics=polygon"

    extract_and_parse_metadata(rtsp_url)