add progress bar for video download

app.py

@@ -73,6 +73,10 @@ selected_visualizations = [viz for viz in visualizations if viz['display_name']
 if not st.button('Get Results'):
     st.stop()
 
+st.write("Retrieving results...")
+progress_bar = st.progress(0)
+
+
 gt_only_viz = [viz for viz in selected_visualizations if viz['viz_type'] == 'gt_only']
 model_only_viz = [viz for viz in selected_visualizations if viz['viz_type'] == 'model_only']
 both_viz = [viz for viz in selected_visualizations if viz['viz_type'] == 'both']
@@ -95,6 +99,8 @@ gt_viz.extend([viz for viz in gt_only_viz if viz['gt_type'] == 'event'])
 num_gt_rows = len(gt_viz)
 num_rows = max(num_model_rows, num_gt_rows)
 
+total_videos_needed = len(selected_models) * num_model_rows + num_gt_rows
+
 if len(gt_viz) > 0:
     selected_models.append(ground_truth)
 
@@ -125,6 +131,7 @@ else:
 for row_idx in range(num_rows):
     for col_idx in range(num_cols):
         vid_idx = len(video_paths)
+        progress_bar.progress(float(vid_idx) / total_videos_needed)
         cur_model = selected_models[col_idx]
         if cur_model['name'] == "gt":
             if row_idx < len(gt_viz):