tracking two video

[anonyprogrammer]

Hi, I want to do speed estimate and object tracking for two video and when I do that with thread it goes until the second thread stop with this error :
Traceback (most recent call last):
File "C:\Users\Administrator\AppData\Local\Programs\Python\Python310\lib\threading.py", line 953, in run
self._target(*self._args, **self._kwargs)
File "G:\Programming\Python Project\Speed Detection\myVenv\lib\site-packages\torch\utils_contextlib.py", line 115, in decorate_context
return func(*args, **kwargs)
File "G:\Programming\Python Project\Speed Detection\YOLOv8-DeepSORT-Object-Tracking\ultralytics\yolo\engine\predictor.py", line 189, in call
s += self.write_results(i, preds, (p, im, im0s))
File "G:\Programming\Python Project\Speed Detection\YOLOv8-DeepSORT-Object-Tracking\ultralytics\yolo\v8\detect\predict.py", line 326, in write_results
outputs = deepsort.update(xywhs, confss, oids, im0)
File "G:\Programming\Python Project\Speed Detection\YOLOv8-DeepSORT-Object-Tracking\ultralytics\yolo\v8\detect\deep_sort_pytorch\deep_sort\deep_sort.py", line 39, in update
self.tracker.update(detections)
File "G:\Programming\Python Project\Speed Detection\YOLOv8-DeepSORT-Object-Tracking\ultralytics\yolo\v8\detect\deep_sort_pytorch\deep_sort\sort\tracker.py", line 74, in update
self._match(detections)
File "G:\Programming\Python Project\Speed Detection\YOLOv8-DeepSORT-Object-Tracking\ultralytics\yolo\v8\detect\deep_sort_pytorch\deep_sort\sort\tracker.py", line 130, in _match
linear_assignment.min_cost_matching(
File "G:\Programming\Python Project\Speed Detection\YOLOv8-DeepSORT-Object-Tracking\ultralytics\yolo\v8\detect\deep_sort_pytorch\deep_sort\sort\linear_assignment.py", line 56, in min_cost_matching
cost_matrix = distance_metric(
File "G:\Programming\Python Project\Speed Detection\YOLOv8-DeepSORT-Object-Tracking\ultralytics\yolo\v8\detect\deep_sort_pytorch\deep_sort\sort\iou_matching.py", line 74, in iou_cost
if tracks[track_idx].time_since_update > 1:
IndexError: list index out of range
what do you suggest me to do?
and is there another way to do that without a thread?
I want to do that with an id for every video to save its detections with its video id
please help me with this error
thanks for your Time...