How to access pastframeobj data while using deepstream-nvdsanalytics.py like the way in the deepstream_test_2.py?

As the topic said, I want to access the pastframeobj data like bellow:

    #past traking meta data
    if(past_tracking_meta[0]==1):
        l_user=batch_meta.batch_user_meta_list
        while l_user is not None:
            try:
                # Note that l_user.data needs a cast to pyds.NvDsUserMeta
                # The casting is done by pyds.NvDsUserMeta.cast()
                # The casting also keeps ownership of the underlying memory
                # in the C code, so the Python garbage collector will leave
                # it alone
                user_meta=pyds.NvDsUserMeta.cast(l_user.data)
            except StopIteration:
                break
            if(user_meta and user_meta.base_meta.meta_type==pyds.NvDsMetaType.NVDS_TRACKER_PAST_FRAME_META):
                try:
                    # Note that user_meta.user_meta_data needs a cast to pyds.NvDsPastFrameObjBatch
                    # The casting is done by pyds.NvDsPastFrameObjBatch.cast()
                    # The casting also keeps ownership of the underlying memory
                    # in the C code, so the Python garbage collector will leave
                    # it alone
                    pPastFrameObjBatch = pyds.NvDsPastFrameObjBatch.cast(user_meta.user_meta_data)
                except StopIteration:
                    break
                for trackobj in pyds.NvDsPastFrameObjBatch.list(pPastFrameObjBatch):
                    print("streamId=",trackobj.streamID)
                    print("surfaceStreamID=",trackobj.surfaceStreamID)
                    for pastframeobj in pyds.NvDsPastFrameObjStream.list(trackobj):
                        print("numobj=",pastframeobj.numObj)
                        print("uniqueId=",pastframeobj.uniqueId)
                        print("classId=",pastframeobj.classId)
                        print("objLabel=",pastframeobj.objLabel)
                        for objlist in pyds.NvDsPastFrameObjList.list(pastframeobj):
                            print('frameNum:', objlist.frameNum)
                            print('tBbox.left:', objlist.tBbox.left)
                            print('tBbox.width:', objlist.tBbox.width)
                            print('tBbox.top:', objlist.tBbox.top)
                            print('tBbox.right:', objlist.tBbox.height)
                            print('confidence:', objlist.confidence)
                            print('age:', objlist.age)
            try:
                l_user=l_user.next
            except StopIteration:
                break

What should I do , if I want to do the same thing at deepstream-nvdsanalytics.py example code?

You need to set “enable-past-frame” property of nvtracker to 1 in the pipeline(Gst-nvtracker — DeepStream 6.0 Release documentation). And then you can use the code you paste to get NvDsPastFrameObj meta.(NVIDIA DeepStream SDK API Reference: _NvDsPastFrameObj Struct Reference)

1 Like

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.