Update app_multi.py

app_multi.py

@@ -433,7 +433,7 @@ def youtube_downloader(
             "outtmpl": 'dl_audio/youtube_audio',
         }
         with yt_dlp.YoutubeDL(ydl_opts) as ydl:
-            ydl.download([url])
+            ydl.download([video_identifier])
         audio_path = "dl_audio/youtube_audio.wav"
         return audio_path