# Injecting dection for Nvtacker

**URL:** <https://forums.developer.nvidia.com/t/injecting-dection-for-nvtacker/341313>\
**Category:** DeepStream SDK\
**Tags:** deepstream, jetson\
**Created:** [August 5, 2025, 1:22pm UTC](https://forums.developer.nvidia.com/t/injecting-dection-for-nvtacker/341313 "2025-08-05T13:22:52Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![michelcalifornia](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@michelcalifornia](https://forums.developer.nvidia.com/u/michelcalifornia)\
**Post date:** [August 5, 2025, 1:22pm UTC](https://forums.developer.nvidia.com/t/injecting-dection-for-nvtacker/341313/1 "2025-08-05T13:22:52Z")

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Hi,

I’m creating a pipeline (C/C++) that does not use nvinfer but inject detections from fusion detector and would like to use the Nvtracker for tracking objects:

If I use UNTRACKED\_OBJECT\_ID the object are not used by the tracker and nothing appears on the src pad, BUT if I set the ObjectID to 1 for instance the objects are not rejected but not really tracked. but the nvOSD is displaying the BB.

?? any idea ? topic already find in the forum but we no definite answers …

Jetson Orin Nano  
CUDA: 12.6.68  
TensorRT: 10.2.0.30

```auto
Using gst-nvtracker for object tracking with config file: nvtracker_config.yml
input source /dev/video0
Creating GStreamer capture for device: /dev/video0
gst_capture_create: device=/dev/video0, size=1280x720, fps=30
DEBUG: Pipeline created: 0xaaaad2422200
Creating pipeline: v4l2src device=/dev/video0 io-mode=4 ! image/jpeg,width=1280,height=720,framerate=30/1 ! jpegdec ! nvvidconv ! video/x-raw(memory:NVMM),format=RGBA ! tee name=t t. ! queue ! appsink name=sink t. ! queue name=mux_queue nvstreammux name=stream-muxer width=1280 height=720 batch-size=1 batched-push-timeout=33333 live-source=1 ! nvtracker name=tracker ! nvdsosd name=osd display-bbox=true display-clock=false process-mode=0 ! nv3dsink sync=false
Configuring appsink...
Configuring nvtracker with library and config file...
nvtracker configured with NvMultiObjectTracker library
Starting pipeline...
gstnvtracker: Loading low-level lib at /opt/nvidia/deepstream/deepstream/lib/libnvds_nvmultiobjecttracker.so
[NvMultiObjectTracker] Initialized

```

…

```auto
DEBUG: Set frame_meta->num_obj_meta = 10 for frame 4
[nvtracker probe] Frame 14 has 10 obj_meta(s)
  -> Object ID: 18446744073709551615, class_id: 57, component_id: 1, conf: 0.56, rect=(116.0,393.0,420.0,185.0)
  -> Object ID: 18446744073709551615, class_id: 57, component_id: 1, conf: 0.58, rect=(1026.0,348.0,252.0,226.0)
  -> Object ID: 18446744073709551615, class_id: 57, component_id: 1, conf: 0.64, rect=(664.0,388.0,342.0,96.0)
  -> Object ID: 18446744073709551615, class_id: 58, component_id: 1, conf: 0.60, rect=(1126.0,308.0,116.0,150.0)
  -> Object ID: 18446744073709551615, class_id: 56, component_id: 1, conf: 0.66, rect=(1024.0,347.0,254.0,227.0)
  -> Object ID: 18446744073709551615, class_id: 56, component_id: 1, conf: 0.80, rect=(316.0,349.0,68.0,54.0)
  -> Object ID: 18446744073709551615, class_id: 56, component_id: 1, conf: 0.88, rect=(208.0,349.0,68.0,52.0)
  -> Object ID: 18446744073709551615, class_id: 56, component_id: 1, conf: 0.83, rect=(0.0,336.0,44.0,222.0)
  -> Object ID: 18446744073709551615, class_id: 39, component_id: 1, conf: 0.54, rect=(728.0,516.0,34.0,59.0)
  -> Object ID: 18446744073709551615, class_id: 39, component_id: 1, conf: 0.73, rect=(764.0,379.0,36.0,50.0)

```

Please provide complete information as applicable to your setup.

**• Hardware Platform (Jetson / GPU)**  
**• DeepStream Version**  
**• JetPack Version (valid for Jetson only)**  
**• TensorRT Version**  
**• NVIDIA GPU Driver Version (valid for GPU only)**  
**• Issue Type( questions, new requirements, bugs)**  
**• How to reproduce the issue ? (This is for bugs. Including which sample app is using, the configuration files content, the command line used and other details for reproducing)**  
**• Requirement details( This is for new requirement. Including the module name-for which plugin or for which sample application, the function description)**

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<div class="post-metadata">

**Author:** ![kesong](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/kesong/32/101255_2.png) [@kesong](https://forums.developer.nvidia.com/u/kesong)\
**Post date:** [August 6, 2025, 12:30am UTC](https://forums.developer.nvidia.com/t/injecting-dection-for-nvtacker/341313/3 "2025-08-06T00:30:13Z")

</div>

Please compare the NvDsBatchMeta which added by you and the output of nvinfer. Please ensure set: frame\_meta-\>bInferDone = TRUE;

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<div class="post-metadata">

**Author:** ![michelcalifornia](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@michelcalifornia](https://forums.developer.nvidia.com/u/michelcalifornia)\
**Post date:** [August 8, 2025, 9:28am UTC](https://forums.developer.nvidia.com/t/injecting-dection-for-nvtacker/341313/4 "2025-08-08T09:28:25Z")

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> [@kesong](#):
>
> Please ensure set: frame\_meta-\>bInferDone = TRUE;

Thanks that is working now setting binferDone !!!

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<div class="post-metadata">

**Author:** ![system](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/system/32/68080_2.png) [@system](https://forums.developer.nvidia.com/u/system)\
**Post date:** [August 22, 2025, 9:28am UTC](https://forums.developer.nvidia.com/t/injecting-dection-for-nvtacker/341313/5 "2025-08-22T09:28:33Z")

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Closed on August 22, 2025, 9:28am UTC

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