How to limit processing number of frames per second in network optix?

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akshay thoughtclan

• April 10, 2020 06:11

I am using Nx version=4.1.0.30731. I am using hello world sample plugin. In the device_agent.cpp file `

generateObjectMetadataPacket` this function produces metadata packet for all the frames. i.e., if my video fps is 30 then 30 times it generates metadata for a sec. I am planning to compute these coordinates by calling python REST API. it's a time consuming task. so, I don't want to compute coordinates for each frames. I want to limit to n frames. where n is some fixed low value. How to do this in network optix? 

 

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  Nx Support

  • April 10, 2020 23:14

  You can implement drop frame function inside your plugin, you don't have to send bounding boxes for every frame.

  7-11 fps is usually enough.

   

  Also, if you have standalone analytics service it might be an option to request the video from the server using RTSP and then delivering bounding boxes back through the plugin. Then you can control the drop frame in your processing pipeline

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  Mohamed Thasin

  • April 11, 2020 04:56

  I am controlling the frames using `frameindex` variable. So, this issue is resolved. Accessing video through RTSP is currently not suitable for my application. I'll keep this in my mind for the future development.

  I am struggling to send frame to my REST API.
  How to send video frame as image to REST API? Could you help me to solve this?

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  Andrey Terentyev

  • June 03, 2020 11:45
  • Edited

  Hello Mohamed Thasin ,

  The Server delivers video frames to plugin by pushUncompressedVideoFrame or pushCompressedVideoFrame methods of DeviceAgent class. Both methods accept a pointer to the structure, that  contains actrlal frame data, which could be sent to your server over REST API. For more detail read the Metadata SDK documentation supplied with SDK.

  This post as well gives a guideline and useful link for further reading:

  https://support.networkoptix.com/hc/en-us/community/posts/360043199653/comments/360010973914

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