Update tracker.py

tracker.py

@@ -1,6 +1,9 @@
 import numpy as np
 from filterpy.kalman import KalmanFilter
 from scipy.optimize import linear_sum_assignment
+import logging
+
+logger = logging.getLogger(__name__)
 
 class BYTETracker:
     def __init__(self, track_thresh=0.3, track_buffer=90, match_thresh=0.5, frame_rate=30):
@@ -14,6 +17,8 @@ class BYTETracker:
         self.worker_history = {}
         self.last_positions = {}
         self.recently_removed = {}
+        logger.info("BYTETracker initialized with track_thresh=%.2f, track_buffer=%d, match_thresh=%.2f", 
+                    track_thresh, track_buffer, match_thresh)
 
     def _init_kalman(self):
         kf = KalmanFilter(dim_x=4, dim_z=2)
@@ -47,6 +52,9 @@ class BYTETracker:
             self.tracks[track_id]['bbox'][:2] = kf.x[:2].flatten()
 
         # Match detections to tracks
+        if len(dets) == 0:
+            return tracks
+
         cost_matrix = np.zeros((len(dets), len(self.tracks)))
         track_ids = list(self.tracks.keys())
         for i, det in enumerate(dets):