Please provide complete information as applicable to your setup. • DeepStream Version: 7.X I have a pipeline which in general looks like this: source -> decode --(I want to put some data here using probe)-> process -> streammux -> nvinfer -(I want to read these data here)-> display In 2022 it wa…

Just from the log you attached, the 2nd parameter is None which is incompatible function arguments. Could you refer to our C code first to learn how to use this feature? deepstream\sources\apps\sample_apps\deepstream-gst-metadata-test

SIDENOTE I made mistake during copying error, there was none in 3rd , not 2nd argument Could you refer to our C code first to learn how to use this feature? Yes I refered to C code from your repos and it looked like this GstBuffer *buf = (GstBuffer *) info->data; NvDsMeta *meta = NULL; H…

I also checked docs for this API NVIDIA DeepStream SDK API Reference: DeepStream Metadata Extension And according to them 2nd and 3rd arguments should contain gpointers to structures (Null values should also be valid pointers).

[image] pkot: And according to them 2nd and 3rd arguments should contain gpointers to structures (Null values should also be valid pointers). Yes. But this is just applicable to the C/C++ language. For python, these two parameters require capsule type. So you need to use 2capsule parameters …

@yuweiw Do you know what capsule is?

You can refer to capsule and we also used the variable of capsule type in the deepstream_imagedata-multistream_cupy.py . We currently do not have a sample for this gst_buffer_add_nvds_meta API in python. You will need to implement it yourself at present.

[image] yuweiw: You can refer to capsule and we also used the variable of capsule type in the deepstream_imagedata-multistream_cupy.py . In the docs you mention mention there are C API-s for capsule, not the Python ones. Your bindings for this API seem to be broken, because my attempts to pass…

@yuweiw In this post: Attaching User Metadata to GStreamer Buffer using Python Bindings - #12 by yuweiw You stated that: We’ll develop it and provide a guide for this in the future version. Could you tell me where this guide is placed?

Another thread with the same issue: How to pass MetaData from One pipeline node to another - #11 by yuweiw

How to add metadata to plugin before Gst-nvstreammux

Accelerated Computing Intelligent Video Analytics DeepStream SDK

yuweiw September 10, 2025, 1:26am 13

Guide: CUSTOMUSERMETAGUIDE.md.

Some workarounds:
How to add custom metadata in a GStreamer native plugin and access it in Python.

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How to add metadata to plugin before Gst-nvstreammux

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