无法从 deepstream 自定义解析器检索输出

Question

i have a detection task using deepstream custom bounding box parser. I store the inference result in

std::vector<NvDsInferParseObjectInfo>& objectList

in such a way:

NvDsInferObjectDetectionInfo object;
object. classId = static_cast<unsigned int>(class);
object.left = static_cast<unsigned int>(left);
object.top = static_cast<unsigned int>(top);
object.width = static_cast<unsigned int>(width);
object.height = static_cast<unsigned int>(height);
object.detectionConfidence = static_cast<float>(score);
objectList.push_back(object);

I printed out the above values, they do exist. However, when i try to print them out in my program through:

batch_meta = pyds.gst_buffer_get_nvds_batch_meta(hash(gst_buffer))
l_frame = batch_meta.frame_meta_list
frame_meta = pyds.NvDsFrameMeta.cast(l_frame.data)
frame_number=frame_meta.frame_num
num_rects = frame_meta.num_obj_meta
l_obj=frame_meta.obj_meta_list
print(l_obj)
print(num_rects)

It shows None or 0. No output at all.

Any idea on which part i did wrongly? Thanks

Answer 1

Does num_rects show 0 too ?

Be sure to set detection-threshold in the config file of detector Also make sure the bounding boxes lie in the roi property (if set) in the config file

If detector is not primary detector then make sure to set the operate-on-gie property in the config file.