[ie/youtube] Fix `uploader_id` extraction (#11818)

Closes #11816
Authored by: bashonly

yt_dlp/extractor/youtube.py

@@ -518,11 +518,12 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
         return self._search_regex(rf'^({self._YT_CHANNEL_UCID_RE})$', ucid, 'UC-id', default=None)
 
     def handle_or_none(self, handle):
-        return self._search_regex(rf'^({self._YT_HANDLE_RE})$', handle, '@-handle', default=None)
+        return self._search_regex(rf'^({self._YT_HANDLE_RE})$', urllib.parse.unquote(handle or ''),
+                                  '@-handle', default=None)
 
     def handle_from_url(self, url):
         return self._search_regex(rf'^(?:https?://(?:www\.)?youtube\.com)?/({self._YT_HANDLE_RE})',
-                                  url, 'channel handle', default=None)
+                                  urllib.parse.unquote(url or ''), 'channel handle', default=None)
 
     def ucid_from_url(self, url):
         return self._search_regex(rf'^(?:https?://(?:www\.)?youtube\.com)?/({self._YT_CHANNEL_UCID_RE})',
@@ -2801,6 +2802,35 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                 'extractor_args': {'youtube': {'player_client': ['ios'], 'player_skip': ['webpage']}},
             },
         },
+        {
+            # uploader_id has non-ASCII characters that are percent-encoded in YT's JSON
+            'url': 'https://www.youtube.com/shorts/18NGQq7p3LY',
+            'info_dict': {
+                'id': '18NGQq7p3LY',
+                'ext': 'mp4',
+                'title': '아이브 이서 장원영 리즈 삐끼삐끼 챌린지',
+                'description': '',
+                'uploader': 'ㅇㅇ',
+                'uploader_id': '@으아-v1k',
+                'uploader_url': 'https://www.youtube.com/@으아-v1k',
+                'channel': 'ㅇㅇ',
+                'channel_id': 'UCC25oTm2J7ZVoi5TngOHg9g',
+                'channel_url': 'https://www.youtube.com/channel/UCC25oTm2J7ZVoi5TngOHg9g',
+                'thumbnail': r're:https?://.+/.+\.jpg',
+                'playable_in_embed': True,
+                'age_limit': 0,
+                'duration': 3,
+                'timestamp': 1724306170,
+                'upload_date': '20240822',
+                'availability': 'public',
+                'live_status': 'not_live',
+                'view_count': int,
+                'like_count': int,
+                'channel_follower_count': int,
+                'categories': ['People & Blogs'],
+                'tags': [],
+            },
+        },
     ]
 
     _WEBPAGE_TESTS = [