Postprocessor performed on Primary Inference Source Probe not allowing Secondary Inference to Process results

• Hardware Platform (Jetson / GPU)
Jetson Orin AGX Dev Kit
RTXA4000, Driver Version 515.86.01 Dell XPS intel I7-10700 CPU
• DeepStream Version
• JetPack Version (valid for Jetson only)

We have a post processing library that works with a secondary inference, we are able to access the output tensor of the secondary inference in a source probe. We are using a python application.

The issue is the obj_meta.obj_user_meta_list shows as None when implementing the exact post processor on the primary inference source probe instead of using a postproc library.

The object meta gets placed correctly including the rect_params, confidence, classid, object_id, object label, text_params, bboxinfo, and unique_component_id.

On the frame level, the number of objects is set correctly, bInferDone is set to 1, and the source width/height are set correctly. We can access the frame and object meta data in the secondary source probe as shown:

obj_user_meta_list None, height 375.0 width 162.0 class_id 1
top 233.0 left 271.0
bbox info: left 271.0406188964844
bbox info: top 233.3119354248047
bbox info: width 162.89999389648438
bbox info: height 375.16741943359375

As you see the obj_user_meta_list is None, we know the models are working and the configuration files are correct because, as mentioned, we are able to extract the obj_user_meta_list from the post processor library implementation.

So my question is whats missing here? Is the secondary inference looking for some kind frame_user_meta, or obj_user_meta data?

Here is what we are basing our python application from, how could this be used with a secondary network?

deepstream_python_apps/ at master · NVIDIA-AI-IOT/deepstream_python_apps (

Can you provide your code and configurations? We don’t know what kind of DsUserMeta you expected. Your description is confusing.

No. SGIE works only on the objects detected by PGIE.

this needed to be done in python for secondary inference to work:
obj_meta->unique_component_id = meta->unique_id;

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