[cleanup] Add deprecation warnings

1 files changed, 8 insertions, 0 deletions

diff --git a/yt_dlp/YoutubeDL.py b/yt_dlp/YoutubeDL.py
index 593f73f87..a6e0163af 100644
--- a/yt_dlp/YoutubeDL.py
+++ b/yt_dlp/YoutubeDL.py
@@ -566,6 +566,8 @@ class YoutubeDL(object):
 
         for msg in self.params.get('_warnings', []):
             self.report_warning(msg)
+        for msg in self.params.get('_deprecation_warnings', []):
+            self.deprecation_warning(msg)
 
         if 'list-formats' in self.params.get('compat_opts', []):
             self.params['listformats_table'] = False
@@ -886,6 +888,12 @@ class YoutubeDL(object):
                 return
             self.to_stderr(f'{self._format_err("WARNING:", self.Styles.WARNING)} {message}', only_once)
 
+    def deprecation_warning(self, message):
+        if self.params.get('logger') is not None:
+            self.params['logger'].warning('DeprecationWarning: {message}')
+        else:
+            self.to_stderr(f'{self._format_err("DeprecationWarning:", self.Styles.ERROR)} {message}', True)
+
     def report_error(self, message, tb=None):
         '''
         Do the same as trouble, but prefixes the message with 'ERROR:', colored