[Nx plugin integration] Thumbnail showed the wrong image for the Object event.

Answered

Bobby Chen

August 05, 2021 09:52 Edited

The result:

• Case1: the thumbnail showed the wrong image (bounding box info and video playback are correct) for the Object event.

• Case 2: Show the wrong thumbnail from wrong camera.

• Case 3: Show no data for thumbnail.

 

Below is our flow and relative API on Object.

Flow:

1. NX Plugin receives info from FaceMe Security Central.
2. Parse http response from FaceMe Security Central.
3. Create MetaDataPacket with MetaData
4. Push MetaDataPacket to DeviceAgent.

API:

Create Object and DeviceAgnet.

• Step 1:

Create ObjectMetadataPacket and setup info to MetaDataPacket

void ObjectMetadataPacket::setTimestampUs(int64_t timestampUs)
void ObjectMetadataPacket::setDurationUs(int64_t durationUs)

• Step 2:

Create ObjectMetadata and setup info to MetaData

void ObjectMetadata::setTypeId(std::string typeId)
void ObjectMetadata::setTrackId(const Uuid& value)
void ObjectMetadata::setBoundingBox(const Rect& rect) // Relative X/Y and Frame width/height
void ObjectMetadata::addAttribute(nx::sdk::Ptr<Attribute> attribute)  // All attributes from FaceMe Security Central

• Step 3:

Add MetaData to MetaDataPacket

void ObjectMetadataPacket::addItem(const IObjectMetadata* objectMetadata)

• Step 4:

Push MetaDataPacket to ConsumingDeviceAgent

void ConsumingDeviceAgent::pushMetadataPacket

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• 

  Anton Babinov

  • Network Optix team

  August 05, 2021 10:26

  Hi Bobby,

  have you checked our troubleshooting article https://support.networkoptix.com/hc/en-us/articles/1500006332441-Troubleshooting-Analytics-Issues-for-Cameras-and-Plugins? It includes instruction on how to enable analytic logging and provides troubleshooting steps for some of your cases.

  Case1: the thumbnail showed the wrong image (bounding box info and video playback are correct) for the Object event.

  Case 2: Show the wrong thumbnail from wrong camera

  Case 3: Show no data for thumbnail.

  How do you generate trackId for your object? Such behaviour can occur if generated tackId isn't unique for each object.

   

   

  1
• 

  Bobby Chen

  August 06, 2021 07:17

  Hi Anton,

  We use NX SDK randomUuid API to set track id

  track_id_ = nx::sdk::UuidHelper::randomUuid();

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• 

  Anton Babinov

  • Network Optix team

  August 24, 2021 14:05

  Hi Bobby,

  sorry for the delayed response. Without samples of your code or detailed logs there is not much we can troubleshoot. Have you tried following our troubleshooting guide to investigate the issue?

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• 

  Andrey Terentyev

  • Network Optix team

  November 09, 2021 15:05

  Hello,

  The troubleshooting of similar issues is covered in this guide.

  https://support.networkoptix.com/hc/en-us/articles/1500006332441-Troubleshooting-Analytics-Issues-for-Cameras-and-Plugins

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• 

  Andrey Terentyev

  • Network Optix team

  March 10, 2022 12:18

  Hello,

  The issue was caused by track id duplication and has been resolved by using up-to-date version 5.0 of the Metadata SDK.

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