diff --git a/data/self_supervised_temporal_labeled_mask_online_dataset.py b/data/self_supervised_temporal_labeled_mask_online_dataset.py
index e11544562..b23d9015c 100644
--- a/data/self_supervised_temporal_labeled_mask_online_dataset.py
+++ b/data/self_supervised_temporal_labeled_mask_online_dataset.py
@@ -1,9 +1,9 @@
 import os
 import random
 import re
-
+import bisect
 import torch
-
+from collections import OrderedDict
 from data.base_dataset import BaseDataset, get_transform_list
 from data.image_folder import make_labeled_path_dataset
 from data.online_creation import crop_image
@@ -60,6 +60,29 @@ def __init__(self, opt, phase, name=""):
 
         self.A_size = len(self.A_img_paths)  # get the size of dataset A
 
+        self.frames_counts = OrderedDict()
+        for path in self.A_img_paths:
+            vid_series_paths = os.path.dirname(path)
+            if vid_series_paths not in self.frames_counts:
+                self.frames_counts[vid_series_paths] = (
+                    0,
+                    -self.num_frames * self.frame_step,
+                )
+            count, count_minus = self.frames_counts[vid_series_paths]
+            count += 1
+            self.frames_counts[vid_series_paths] = (
+                count,
+                count - self.num_frames * self.frame_step,
+            )
+
+        self.cumulative_sums = []
+        cumulative_sum = 0
+        self.vid_series_keys = list(self.frames_counts.keys())
+        for _, (_, count_minus) in self.frames_counts.items():
+            if count_minus > 0:
+                cumulative_sum += count_minus
+            self.cumulative_sums.append(cumulative_sum)
+
     def get_img(
         self,
         A_img_path,
@@ -71,30 +94,39 @@ def get_img(
         index=None,
     ):  # all params are unused
 
-        while True:
-
+        if len(self.frames_counts) == 1:  # single video mario
             index_A = random.randint(0, self.range_A - 1)
+        else:  # video series
+            range_A = sum(
+                count_minu
+                for count, count_minu in self.frames_counts.values()
+                if count_minu > 0
+            )
+            index_A = random.randint(0, range_A - 1)
+            selected_index = bisect.bisect_right(self.cumulative_sums, index_A)
+            selected_key = self.vid_series_keys[selected_index]
+            path_num = (
+                index_A - self.cumulative_sums[selected_index - 1]
+                if selected_index > 0
+                else 0
+            )
+            filtered_paths = [
+                path
+                for path in self.A_img_paths
+                if os.path.dirname(path) == selected_key
+            ]
+            if path_num < len(filtered_paths):  # this is absolu true
+                selected_path = filtered_paths[path_num - 1]
+            else:
+                print("Path number exceeds available paths in the selected directory")
+
+            index_A = self.A_img_paths.index(selected_path)
+
+        images_A = []
+        labels_A = []
+        ref_A_img_path = self.A_img_paths[index_A]
+        ref_name_A = ref_A_img_path.split("/")[-1][: self.num_common_char]
 
-            images_A = []
-            labels_A = []
-
-            ref_A_img_path = self.A_img_paths[index_A]
-            ref_name_A = ref_A_img_path.split("/")[-1][: self.num_common_char]
-            ref_A_name = ref_A_img_path.split("/")[-1]  # fullname of the ref_A
-
-            vid_series_path = os.path.dirname(ref_A_img_path)
-            vid_series = vid_series_path.split("/")[-1]
-            if ref_A_name.startswith(
-                vid_series
-            ):  # dataset contains different video in form of img/vid_series/vid_seriesframe.jpg
-                series_count = sum(vid_series_path in path for path in self.A_img_paths)
-                frame_num = int(ref_A_name[len(vid_series) : -4])  # remove ".jpg"
-                if frame_num < (series_count - self.num_frames):
-                    break
-                else:
-                    print("Condition not met, generating a new index_A...")
-            else:  # dataset from one video in form of img/frames.jpg
-                break
         for i in range(self.num_frames):
             cur_index_A = index_A + i * self.frame_step