Update app.py

app.py

@@ -328,7 +328,7 @@ button:hover {
 
 def download_audio(url, cookie_file):
     ydl_opts = {
-        'format': 'bestaudio/best',
+        'format': 'bestaudio[ext=webm]/bestaudio[ext=m4a]/bestaudio/best',  # Prioritize audio-only formats
         'postprocessors': [{
             'key': 'FFmpegExtractAudio',
             'preferredcodec': 'wav',
@@ -350,7 +350,7 @@ def download_audio(url, cookie_file):
     with yt_dlp.YoutubeDL(ydl_opts) as ydl:
         try:
             info_dict = ydl.extract_info(url, download=True)
-            file_path = ydl.prepare_filename(info_dict).replace('.webm', '.wav')  # Adjust extension after extraction
+            file_path = ydl.prepare_filename(info_dict).replace('.webm', '.wav').replace('.m4a', '.wav')  # Adjust extension after extraction
             if not os.path.exists(file_path):
                 return None, "Downloaded file not found", None
             # Read the audio file for gr.Audio
@@ -360,6 +360,8 @@ def download_audio(url, cookie_file):
         except yt_dlp.utils.ExtractorError as e:
             if "Sign in to confirm you’re not a bot" in str(e):
                 return None, "Authentication failed. Please upload updated cookies from a logged-in browser session in the respective tab.", None
+            elif "HTTP Error 403: Forbidden" in str(e):
+                return None, "Download failed: HTTP Error 403. This format requires a GVS PO Token. Try uploading fresh cookies or using a different URL. See https://github.com/yt-dlp/yt-dlp/wiki/PO-Token-Guide for more info.", None
             return None, f"Download failed: {str(e)}", None
         except Exception as e:
             return None, f"Unexpected error: {str(e)}", None