# How to access Deepstream latency informations in python **URL:** \ **Category:** DeepStream SDK\ **Tags:** python\ **Created:** [October 6, 2023, 7:12am UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588 "2023-10-06T07:12:51Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![Alex6s](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@Alex6s](https://forums.developer.nvidia.com/u/Alex6s)\ **Post date:** [October 6, 2023, 7:12am UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/1 "2023-10-06T07:12:51Z")
Please provide complete information as applicable to your setup. **• Hardware Platform (Jetson / GPU)** Jetson Orin AGX **• DeepStream Version** 6.2 **• JetPack Version (valid for Jetson only)** 5.1.1 **• TensorRT Version** **• NVIDIA GPU Driver Version (valid for GPU only)** **• Issue Type( questions, new requirements, bugs)** question **• 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)** I want to get the latency of a (or multiple) component(s) of my pipeline. My code is in python, using the python bindings. I understand that in C++, we would use the function _nvds\_measure\_buffer\_latency()_, but since there is no binding in python for it, I am trying to get NVDS\_LATENCY\_MEASUREMENT\_META user meta from NvDsMetaType, as explained by Fiona.Chen here : [How to get the latency from deepstream python apps - #13 by Fiona.Chen](https://forums.developer.nvidia.com/t/how-to-get-the-latency-from-deepstream-python-apps/197227/13) Taking example on this [NvDsUserMeta — Deepstream Deepstream Version: 6.3 documentation (nvidia.com)](https://docs.nvidia.com/metropolis/deepstream/dev-guide/python-api/PYTHON_API/NvDsMeta/NvDsUserMeta.html), I presume it would look something like this : ```auto def latency_measurement_probe(self,pad, info, u_data): buffer = info.get_buffer() if not buffer: self.logger.info('Unable to get GstBuffer') return batch_meta = pyds.gst_buffer_get_nvds_batch_meta(hash(buffer)) l_user = batch_meta.batch_user_meta_list while l_user is not None: try: user_meta=pyds.NvDsUserMeta.cast(l_user.data) except StopIteration: break if(user_meta and user_meta.base_meta.meta_type == pyds.NvDsMetaType.NVDS_LATENCY_MEASUREMENT_META): try: latency_meta = pyds.NvDsFrameLatencyInfo.cast(user_meta.user_meta_data) #or latency_meta = pyds.NvDsMetaCompLatency.cast(user_meta.user_meta_data) except StopIteration: break latency_ms = latency_meta.latency print("Latency :",latency_ms,"ms") return Gst.PadProbeReturn.OK ``` But neither NvDsFrameLatencyInfo nor NvDsMetaCompLatency exist in the binding. So the question is how can I access latency informations that are in the user metadata in python ? ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [October 7, 2023, 8:41am UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/3 "2023-10-07T08:41:38Z")
You need to bind the structures by referring the [BINDINGSGUIDE.md](https://github.com/NVIDIA-AI-IOT/deepstream_python_apps/blob/master/bindings/BINDINGSGUIDE.md). ---
**Author:** ![Alex6s](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@Alex6s](https://forums.developer.nvidia.com/u/Alex6s)\ **Post date:** [October 9, 2023, 3:09pm UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/5 "2023-10-09T15:09:53Z")
Thank you for the answer. I followed the guide to create binding for the NvDsFrameLatencyInfo struct, but when i look at the latency I get an absurd value (1.145327…93e+243). Am I missing something with my probe code ? ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [October 10, 2023, 2:03am UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/6 "2023-10-10T02:03:14Z")
Yes. You can refer to our C demo code : `latency_info[i].latency`. The latency\_meta should be a list. ---
**Author:** ![Alex6s](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@Alex6s](https://forums.developer.nvidia.com/u/Alex6s)\ **Post date:** [October 10, 2023, 8:37am UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/7 "2023-10-10T08:37:30Z")
I see, but currently my variable latency\_meta is non iterable, maybe i’m casting it wrong ? here is my binding code (I also added binding for the nvds\_measure\_buffer\_latency function but didn’t get more success with it, I just don’t get how to call the function in python) ```auto void bindnvds_latency_meta(py::module &m) { py::class_(m, "NvDsFrameLatencyInfo", pydsdoc::nvds_latency_metadoc::NvDsFrameLatencyInfoDoc::descr) .def(py::init<>()) // Constructor wrapper, empty for struct .def_readwrite("source_id", &NvDsFrameLatencyInfo::source_id) .def_readwrite("frame_num", &NvDsFrameLatencyInfo::frame_num) .def_readwrite("comp_in_timestamp", &NvDsFrameLatencyInfo::comp_in_timestamp) .def_readwrite("latency", &NvDsFrameLatencyInfo::latency) .def("cast", [](void *data) { // Function definition return (NvDsFrameLatencyInfo *) data; // Cast void* to NvDsLatencyInfo* }, py::return_value_policy::reference, // Ownership of return object must remain with C++ pydsdoc::nvds_latency_metadoc::NvDsFrameLatencyInfoDoc::cast); // Docstring m.def("nvds_measure_buffer_latency", &nvds_measure_buffer_latency, "buf"_a, "latency_info"_a, py::return_value_policy::reference, pydsdoc::methodsDoc::nvds_measure_buffer_latency); } // Define the bindings function declared in the header file ``` ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [October 11, 2023, 7:48am UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/8 "2023-10-11T07:48:11Z")
OK. We will try adding this feature next version and notify you once it is completed. ---
**Author:** ![Alex6s](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@Alex6s](https://forums.developer.nvidia.com/u/Alex6s)\ **Post date:** [October 11, 2023, 8:08am UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/10 "2023-10-11T08:08:17Z")
Thank you very much, i’m sure it will help a lot of peoples ---
**Author:** ![omarabdallah300](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@omarabdallah300](https://forums.developer.nvidia.com/u/omarabdallah300)\ **Post date:** [October 23, 2023, 4:32pm UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/11 "2023-10-23T16:32:30Z")
Hi there, I came across this thread when I was looking for a method to get latency info for the pipeline in python, I wanted to ask is there any update on the availability of the feature anytime soon? @yuweiw ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [October 24, 2023, 3:07am UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/12 "2023-10-24T03:07:58Z")
We will release this feature in our next version. ---
**Author:** ![omhaimov](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@omhaimov](https://forums.developer.nvidia.com/u/omhaimov)\ **Post date:** [January 7, 2025, 5:01pm UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/13 "2025-01-07T17:01:56Z")
Hi, I came across this thread as well. Is there news regarding exposing the latency information in python? @yuweiw ---
**Author:** ![yuweiw](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/yuweiw/32/101255_2.png) [@yuweiw](https://forums.developer.nvidia.com/u/yuweiw)\ **Post date:** [January 8, 2025, 3:12am UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/14 "2025-01-08T03:12:34Z")
Yes. Please refer to our latest [deepstream-test3](https://github.com/NVIDIA-AI-IOT/deepstream_python_apps/tree/master/apps/deepstream-test3) sample. ---
**Author:** ![Fiona.Chen](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/fiona.chen/32/15508_2.png) [@Fiona.Chen](https://forums.developer.nvidia.com/u/Fiona.Chen)\ **Post date:** [March 10, 2025, 6:41am UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/15 "2025-03-10T06:41:44Z")
**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** ---
**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:** [March 24, 2025, 6:42am UTC](https://forums.developer.nvidia.com/t/how-to-access-deepstream-latency-informations-in-python/268588/16 "2025-03-24T06:42:35Z")
Closed on March 24, 2025, 6:42am UTC This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.