[ie/redtube] Fix formats extraction (#9076)

Authored by: jazz1611

yt_dlp/extractor/redtube.py

@@ -7,6 +7,7 @@
     str_to_int,
     unified_strdate,
     url_or_none,
+    urljoin,
 )
 
 
@@ -79,7 +80,7 @@ def _real_extract(self, url):
                 'media definitions', default='{}'),
             video_id, fatal=False)
         for media in medias if isinstance(medias, list) else []:
-            format_url = url_or_none(media.get('videoUrl'))
+            format_url = urljoin('https://www.redtube.com', media.get('videoUrl'))
             if not format_url:
                 continue
             format_id = media.get('format')