metadata
description: >-
Explore the track.py script for Ultralytics object tracking. Learn how
on_predict_start, on_predict_postprocess_end, and register_tracker functions
work.
keywords: >-
Ultralytics, YOLO, object tracking, track.py, on_predict_start,
on_predict_postprocess_end, register_tracker
Reference for ultralytics/trackers/track.py
!!! note
This file is available at [https://github.com/ultralytics/ultralytics/blob/main/ultralytics/trackers/track.py](https://github.com/ultralytics/ultralytics/blob/main/ultralytics/trackers/track.py). If you spot a problem please help fix it by [contributing](https://docs.ultralytics.com/help/contributing/) a [Pull Request](https://github.com/ultralytics/ultralytics/edit/main/ultralytics/trackers/track.py) 🛠️. Thank you 🙏!