up

.vscode/launch.json

@@ -0,0 +1,19 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug yt-dlp",
+            "type": "debugpy",
+            "request": "launch",
+            "program": "debug.py",
+            "console": "integratedTerminal",
+            "justMyCode": false,
+            //"sudo": true,
+            "args": [
+            ]
+        }
+    ]
+}

debug.py

@@ -27,7 +27,7 @@
 from yt_dlp import YoutubeDL
 
 ydl = YoutubeDL({
-    # "cookiefile":'',
+    # "cookiefile": '',
     # 'ignoreerrors': True,
     # 'plain_entries': True,
     # 'skip_download_media_type': "",
@@ -77,7 +77,7 @@
 )
 
 # ydl.download_with_info_file(os.path.join(current_dir, "debug", "info.json"))
-info = ydl.extract_info('url', download=False)
+info = ydl.extract_info('https://www.youtube.com/watch?v=kyN623RzFe0', download=False)
 s = json.dumps(ydl.sanitize_info(info))
 print(s)
 with open(os.path.join(current_dir, 'debug', 'info.json'), 'w') as f:

yt_dlp/extractor/youtube.py

@@ -726,8 +726,9 @@ def _extract_visitor_data(self, *args):
         Extracts visitorData from an API response or ytcfg
         Appears to be used to track session state
         """
-        if visitor_data := self._configuration_arg('visitor_data', [None], ie_key=YoutubeIE, casesense=True)[0]:
-            return visitor_data
+        visitor_data_cfg = self._configuration_arg('visitor_data', [None], ie_key=YoutubeIE, casesense=True)
+        if visitor_data_cfg and len(visitor_data_cfg) > 0:
+            return visitor_data_cfg[0]
         return get_first(
             args, [('VISITOR_DATA', ('INNERTUBE_CONTEXT', 'client', 'visitorData'), ('responseContext', 'visitorData'))],
             expected_type=str)