> Metadata format for the LPR, Line Counter, Presence Counter and Queue nodes has been updated to reduce duplicate information, and introduce a uniform structure with new properties that can be used to trigger snapshots, video clip capture, webhooks, etc. # Summary Metadata format for the following nodes has been updated to reduce duplicate information, and introduce a uniform structure with new properties that can be used to trigger snapshots, video clip capture, webhooks, etc. : * [License Plate Detection Node](doc:license-plate-detection-node) * [Line Counter Node](doc:line-crossing-counter-node) * [Presence Counter Node](doc:presence-counter-node) * [Queue Length Counter](doc:queue-length-counter-node) These updates take effect when you create new deployments or update existing ones. Starting and stopping existing deployments will not be impacted. If you are expecting the old(er) format metadata, you can turn on legacy metadata option in the node property to keep the older format while you transition to the new format. # What's changed ## Metadata format updates With this update, these nodes insert their metadata inside the root field `nodes`, while previously those nodes used top-level fields like `lpr`, `lines`, `presence`, `queue`. The contents of those fields have now been moved into `nodes.` as per below: * `lpr` -> `nodes..license_plates` * `lines` -> `nodes..lines` * `presence` -> `nodes..rois` * `queue` -> `nodes..rois` To provide for backward compatibility during this transition, the [Line Counter Node](doc:line-crossing-counter-node) and [License Plate Detection Node](doc:license-plate-detection-node) have the option to turn ON the legacy metadata format in node properties. Enabling that option will revert the metadata for those deployments to the older format. ## New metadata properties These nodes now add new metadata to make it easier to trigger webhooks, snapshots, etc. based on the difference in counts between previous and current frame. This makes it easier to trigger when a new car is detected, or when a new object crosses a line, etc. ### License Plate Recognition ``` nodes.annotate_lpr1.license_plates_entered_delta nodes.annotate_lpr1.license_plates_exited_delta nodes.annotate_lpr1.license_plates_count ``` ### Line Counter ``` nodes.annotate_line_counter1.lines..total_objects_crossed_delta nodes.annotate_line_counter1.lines..dir1_objects_crossed_delta nodes.annotate_line_counter1.lines..dir2_objects_crossed_delta ``` ### Presence Counter ``` nodes.annotate_presence1.rois..objects_entered_delta nodes.annotate_presence1.rois..objects_exited_delta nodes.annotate_presence1.rois..objects_above_max_time_threshold_count ``` ### Queue Length Counter ``` nodes.annotate_queue1.rois..objects_entered_delta nodes.annotate_queue1.rois..objects_exited_delta nodes.annotate_queue1.rois..objects_above_max_waiting_time_count ``` For specifics of the new format, see node documentation. # What you need to do * If you have code that parses Lumeo metadata, either in a Custom Function, or sent to you via webhooks, or from a saved clip, you will need to update it to account for the format changes. * If you are using the [Publish to Google Sheets](doc:publish-to-google-sheets-node) node, you will need to update the `Metadata to Publish` property to look for metadata in the new format. Here's an example of the new property value: ``` video*,nodes.*.dir1_objects_crossed,nodes.*.dir2_objects_crossed,nodes.*.total_objects_crossed,nodes.*.diff_objects_crossed ``` * While you make those changes, you can turn on "Legacy Metadata" format from node properties to retain the old format.