Update app.py

app.py

@@ -203,6 +203,7 @@ def randomly_select_videos(env_name):
     with open(VIDEO_INFO, 'r') as fp:
         files = json.load(fp)
     env_files = files[env_name]
+    print(env_name, len(env_files), env_files)
     # randomly choose two videos
     selected_video_ids = np.random.choice(len(env_files), 2, replace=False)
     left_video_path = env_files[selected_video_ids[0]]