Can't get the object_id of sgie parent

[MingGatsby]

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU) GPU
• DeepStream Version 6.1
• NVIDIA GPU Driver Version (valid for GPU only) 510.47.03
• Issue Type( questions, new requirements, bugs) bugs

The code in deepstream-appsrc-test is always error.
“track_id = obj_meta->parent->object_id;”

I need to get sgie parent object_id.
I can’t use “track_id = obj_meta->object_id;”.
That always get “-1”,

[fanzh]

could you share your code diff? if no modification, obj_meta should be NULL, please refer to attach_metadata_detector() in deepstream SDK.

[MingGatsby]

I used the deepstream-app code, I can use the object_id of sgie parent.

However, I used the deepstream-appsrc code, I can’t use the object_id of sgie parent.
It always appears error.

[fanzh]

the default value of object_id is -1, object_id should not be -1 if enable tracker, did you see the object’s track-id on the video screen?

[MingGatsby]

This is my screen. Screen is ok.

However, I wanna get object-parent-id from pgie.
It’s fail at deepstream-appsrc-test, but I can get it at deepstream-app.

Another words, original pipeline is “pgie=>tracker=>sgie”, I changed to “pgie=>sgie=>tracker”.

However, I don’t know how to map pgie-object-id to sgie-object-id.
I wanna know the sgie-object is from which pgie-object.

[fanzh]

please use pgie->tracker->sgie pipeline , pgie will add object meta, this object 's object_id is -1, and its parent object is null, tracker will update object’s object-id.
please refer to attach_metadata_detector.

[MingGatsby]

I mean

My first image is “pgie->tracker->sgie” pipeline.
My Second image is “pgie->sgie->tracker” pipeline.

All is fail, can’t get the object_id of sgie parent.

---

please refer to attach_metadata_detector.
=> I check the method of the gstnvinfer_meta_utils.cpp file.

Therefore, parent object is null, I should how get it? I wanna get parent object from sgie.
Because sgie object_id is “-1”, that’s not useful.

[fanzh]

pgie will add object meta, sgie will not add object meta if sgie is classification, sgie will add classification meta to object, so if tracker is behind sgie, object-id will be -1 because this value will be updated by tracker.

[MingGatsby]

My code in deepstream_main.c is following, it’s successful for getting object meta from sgie.

if (appCtx[i]->config.secondary_gie_sub_bin_config[1].enable) {
    GstPad *src_pad3 = NULL;
    GstElement *gst3 = appCtx[i]->pipeline.common_elements.secondary_gie_bin.sub_bins[1].secondary_gie;
    src_pad3 = gst_element_get_static_pad (gst3, "src");
    if (!src_pad3)
        g_print ("Unable to get secondary_gie0 src pad\n");
    else
    {
        gst_pad_add_probe(src_pad3, GST_PAD_PROBE_TYPE_BUFFER,
                  sgie1_src_pad_buffer_probe, NULL, NULL);
        gst_object_unref (src_pad3);
    }
}

This part means I let sgie as pge to add object meta?

If I wanna write this part to deepstream_appsrc.c, have any advice?

Becasue I try to get it, it’s different as this part in deepstream_main.c.

EX:
“osd_sink_pad_buffer_probe” from osd_sink_pad.
or
“srcpad_buff_probe” from srcpad.

I still can’t get parent_object_track_id from sgie.

[fanzh]

1. this code is to add probe function sgie1_src_pad_buffer_probe on sgie’s src, you can also do this in deepstream_appsrc.c. osd is behind sgie, sgie and osd 's src alll are ok.
2. if sgie is also a detection, it will add new object, the new object ‘s parent should be the object pgie added, then you can know the sgie-object is from which pgie-object. if sgie is classification, the objects are added by pgie, the objects’ s parent is NULL.

[MingGatsby]

Thank you, it’s successfull.