Message format for signal gate node

Question

Hi everyone,
I have scenario where i need to store the video based particular event. So i planned to used signal gate node.
from example, its start storing the video when motion detect , but did not give more detail about what message send to signal gate nodes.
As per theory need to send some event message to gate node in order activate and i want to send the that event message from my inference AI module which is implemented as http extension.
I have two question as

1. I am planning to add this event message in inference message and send to signal gate node as well as iot hub sink, signal gate node get trigger and start storing video, what is format of event message for signal gate node
2. i have different situation for start recording and stop recording, but with gate node , i can start video recording and but dont have control over stop recording, so how do I achieve it ?

Please anyone know answer ,let me know

Thanks in advance

Answer 1

Hello @Choubey, Gaurav ,
Could you please confirm that you are following this How-To Guide?

• Configure a signal gate for event-based video recording

On that how-to guide you can see the answer to your second question, you can define the duration of the recording:

2. i have different situation for start recording and stop recording, but with gate node , i can start video recording and but dont have control over stop recording, so how do I achieve it ?

"When it's triggered, the gate opens and lets media flow through for a specified duration. In the absence of events to trigger the gate, the gate closes, and media stops flowing."

1. I am planning to add this event message in inference message and send to signal gate node as well as iot hub sink, signal gate node get trigger and start storing video, what is format of event message for signal gate node

For that you would need to define Media graph topologies and instances:

"A graph topology enables you to define the blueprint of a graph, with parameters as placeholders for values. The topology defines what nodes are used in the media graph, and how they are connected within the media graph."

See for example Video recording based on events from other sources - The JSON representation of the graph topology below can be seen here: https://github.com/Azure/live-video-analytics/blob/master/MediaGraph/topologies/evr-hubMessage-files/topology.json

Hope I could help.

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