Datasets:

chinmay-1302
/

TrackWhy

license: cc-by-nc-sa-3.0
task_categories:
  - video-classification
tags:
  - multi-object-tracking
  - mot20
  - failure-analysis
  - vision-language-models

TrackWhy: Tracker-Failure Clips

284 video clips of multi-object tracking failures, rendered from tracker output over MOT20 sequences MOT20-01 and MOT20-03. Each clip centres on one failure event drawn from a pool of 1,164 mined events, stratified at roughly 30 clips per condition category.

Companion release: annotations, attributor code and model outputs at https://github.com/chinmay-1302/trackwhy. Paper: https://openreview.net/pdf?id=TRJ7gFUnta. Project page: https://chinmay-1302.github.io/trackwhy-page/.

The full tree is about 3.4 GB.

Path	Description
`clips/`	Supervision-free rendering: highlight pinned to one tracker ID, never re-anchored
`clips_gt_informed/`	Ground-truth-informed rendering: highlight re-anchors to the matched track
`manifest.csv`	Clip ID, sequence, frame range, highlighted track IDs, rendering regime

Each directory contains C001.mp4–C284.mp4. Clips span 81–201 frames (median 93), play at 10 fps against a 25 fps source, and show tracker output only — every tracker box with its numeric ID, the target highlighted. No ground-truth geometry appears in any frame.

The Hub viewer’s label column is the source directory. The two regimes are paired renderings of the same 284 clips, not classes; manifest.csv carries the real per-clip metadata.

manifest.csv has one row per clip per regime (568 rows). For regime=supervision_free, highlight_after_track_id is the successor identity that the ground-truth-informed render re-anchors to; that highlight is not drawn in clips/.

The two video directories both include C205. The companion ground-truth-informed annotation reference omits that clip (283 records); the supervision-free reference keeps it (284). The videos themselves are released for both regimes.

The two rendering regimes

They differ at the failure and the difference is load-bearing. Under ground-truth-informed rendering the highlight re-anchors to whichever tracker box the ground truth now matches, so the visualisation appears continuous and the only cue that anything happened is the change of label digits. Under supervision-free rendering the highlight is pinned to one tracker identity and ends with it, and the successor appears as an ordinary unhighlighted box among the others.

A reader who mixes the two directories will not reproduce the paper's numbers.

Licence and attribution

These clips are derivative works of the MOT20 dataset and are released under CC BY-NC-SA 3.0, the same licence MOT20 carries.

MOT20 is published by the Technical University of Munich Computer Vision Group under CC BY-NC-SA 3.0. If you use this data, cite MOT20 as well as this work:

@article{dendorfer2020mot20,
  title={MOT20: A benchmark for multi object tracking in crowded scenes},
  author={Dendorfer, Patrick and Rezatofighi, Hamid and Milan, Anton and Shi, Javen
          and Cremers, Daniel and Reid, Ian and Roth, Stefan and Schindler, Konrad
          and Leal-Taix{\'e}, Laura},
  journal={arXiv preprint},
  year={2020}
}

@inproceedings{mhatre2026what,
  title={What Counts as a Tracking Failure? Measuring Disagreement Between Metrics, Human Observers, and Vision-Language Models},
  author={Chinmay Mhatre and Sankalp Gawali and Punit Rathore},
  booktitle={Grounded and Faithful Vision-Language Models for Real-World Deployment 2026},
  year={2026},
  url={https://openreview.net/forum?id=TRJ7gFUnta}
}

Note: the MOTChallenge evaluation server is no longer in operation; dataset archives remain available at their published addresses.

TrackWhy: Tracker-Failure Clips

Contents

The two rendering regimes

Licence and attribution