Trying to save frames, saved frames are raw, without bounding boxes even after setting output-tensor-meta =1

[anmolp]

hardware : GPU
Deepstream version : 6.2
NVIDIA GPU Driver Version: 525.60.13
Issue Type: questions

For setting output-tensor-meta property:

pgie.set_property(“output-tensor-meta”, 1)

Inside probe callback function on the sink pad of nvosd element:

n_frame = pyds.get_nvds_buf_surface(hash(gst_buffer), frame_meta.batch_id)
frame_copy = np.array(n_frame, copy=True, order=‘C’)
frame_copy = cv2.cvtColor(frame_copy, cv2.COLOR_RGBA2BGR)

and then saving frame using opencv

The saved frame doesn’t contains Bounding boxes.

what else need to be done. I don’t want to draw bounding boxes explicitly using meta data parameters.

[yuweiw]

When you set output-tensor-meta=1, you should process the tensor output by yourself, like processing tensor, drawing bbox. Could you reproduce you problem with any of our demo code?
https://github.com/NVIDIA-AI-IOT/deepstream_python_apps

[anmolp]

In example deepstream_imagedata-multistream.py

There is a function call draw_bounding_boxes() before saving the frame. Is there any way to get bounding boxes drawn on the frame by setting some parameters in the elements ?

I don’t want to explicitly draw bounding boxes by calling some function.

[yuweiw]

If you get the picture from the osd src-pad probe function, it will draw the bbox on the frame automatically. Because the tiler is in front of osd, so you can only get the raw data without bbox.

[anmolp]

yeah, i have tried that also, its not working.

[yuweiw]

Have you tried to get the picture from the src-pad of osd plugin? Could you attach your code?

[anmolp]

osdsinkpad = nvdsosd.get_static_pad(“sink”)
if not osdsinkpad:
sys.stderr.write(" Unable to get sink pad of nvosd \n")
osdsinkpad.add_probe(Gst.PadProbeType.BUFFER, probe function, 0)

I have attached on sink pad. Do i need to attach on src pad ??

[yuweiw]

Yes. The sink pad is the input end and the src pad is the output end. You need to get the image with bbox from the src pad.

[anmolp]

Yes, its working now. Thanks a lot.
One doubt, output-tensor-meta parameter has nothing to do with this ? because setting its value to 0 or 1 has no impact on output. In all the case, I am getting bbox.

[yuweiw]

There is no update from you for a period, assuming this is not an issue anymore. Hence we are closing this topic. If need further support, please open a new one. Thanks

You can refer to our Guide: https://docs.nvidia.com/metropolis/deepstream/dev-guide/text/DS_plugin_gst-nvinfer.html#id4.
output-tensor-meta=1 means the raw tensor data attaches to the Gstbuffer. If you want to process by yourself, you can get the raw tensor from the Gstbuffer.