[youtube] Better message when login required

yt_dlp/extractor/youtube.py

@@ -85,7 +85,20 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
 
         If _LOGIN_REQUIRED is set and no authentication was provided, an error is raised.
         """
+
+        def warn(message):
+            self.report_warning(message)
+
+        # username+password login is broken
+        if self._LOGIN_REQUIRED and self.get_param('cookiefile') is None:
+            self.raise_login_required(
+                'Login details are needed to download this content', method='cookies')
         username, password = self._get_login_info()
+        if username:
+            warn('Logging in using username and password is broken. %s' % self._LOGIN_HINTS['cookies'])
+        return
+        # Everything below this is broken!
+
         # No authentication to be performed
         if username is None:
             if self._LOGIN_REQUIRED and self.get_param('cookiefile') is None:
@@ -126,9 +139,6 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
                     'Google-Accounts-XSRF': 1,
                 })
 
-        def warn(message):
-            self.report_warning(message)
-
         lookup_req = [
             username,
             None, [], None, 'US', None, None, 2, False, True,
@@ -4018,9 +4028,6 @@ class YoutubeFeedsInfoExtractor(YoutubeTabIE):
     def IE_NAME(self):
         return 'youtube:%s' % self._FEED_NAME
 
-    def _real_initialize(self):
-        self._login()
-
     def _real_extract(self, url):
         return self.url_result(
             'https://www.youtube.com/feed/%s' % self._FEED_NAME,