fix bug

app.py

@@ -66,6 +66,7 @@ def download_video(url):
         try:
           ydl.cache.remove()
           meta = ydl.extract_info(url)
+          title = meta['title']
           thumb_url = meta['thumbnail']
           thumb_location = f"videos/{meta['id']}.{thumb_url.split('.')[-1]}"
           wget.download(thumb_url, out=thumb_location)
@@ -74,11 +75,11 @@ def download_video(url):
           print(f'error with download_video function: {error}')
           save_location = None
           thumb_location = None
-          meta = None
+          title = None
     except IndexError as err:
       print(f"can't find suitable video formats. we are not able to process video larger than 95 Mib at the moment")
-      fps, save_location, thumb_location, meta = None, None, None, None
-    return(fps, save_location, thumb_location, meta['title'])
+      fps, save_location, thumb_location, title = None, None, None, None
+    return(fps, save_location, thumb_location, title)
 
 def process_video_parallel(video, skip_frames, dest_path, num_processes, process_number):
     cap = cv2.VideoCapture(video)