[youtube:tab] Extract video thumbnails from playlist (#2096)

closes #1184
Co-Authored-by: coletdjnz, pukkandan

yt_dlp/extractor/youtube.py

@@ -667,6 +667,30 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
                 if text:
                     return text
 
+    @staticmethod
+    def _extract_thumbnails(data, *path_list):
+        """
+        Extract thumbnails from thumbnails dict
+        @param path_list: path list to level that contains 'thumbnails' key
+        """
+        thumbnails = []
+        for path in path_list or [()]:
+            for thumbnail in traverse_obj(data, (*variadic(path), 'thumbnails', ...), default=[]):
+                thumbnail_url = url_or_none(thumbnail.get('url'))
+                if not thumbnail_url:
+                    continue
+                # Sometimes youtube gives a wrong thumbnail URL. See:
+                # https://github.com/yt-dlp/yt-dlp/issues/233
+                # https://github.com/ytdl-org/youtube-dl/issues/28023
+                if 'maxresdefault' in thumbnail_url:
+                    thumbnail_url = thumbnail_url.split('?')[0]
+                thumbnails.append({
+                    'url': thumbnail_url,
+                    'height': int_or_none(thumbnail.get('height')),
+                    'width': int_or_none(thumbnail.get('width')),
+                })
+        return thumbnails
+
     @staticmethod
     def extract_relative_time(relative_time_text):
         """
@@ -783,6 +807,8 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
         overlay_style = traverse_obj(
             renderer, ('thumbnailOverlays', ..., 'thumbnailOverlayTimeStatusRenderer', 'style'), get_all=False, expected_type=str)
         badges = self._extract_badges(renderer)
+        thumbnails = self._extract_thumbnails(renderer, 'thumbnail')
+
         return {
             '_type': 'url',
             'ie_key': YoutubeIE.ie_key(),
@@ -794,6 +820,7 @@ class YoutubeBaseInfoExtractor(InfoExtractor):
             'view_count': view_count,
             'uploader': uploader,
             'channel_id': channel_id,
+            'thumbnails': thumbnails,
             'upload_date': strftime_or_none(timestamp, '%Y%m%d'),
             'live_status': ('is_upcoming' if scheduled_timestamp is not None
                             else 'was_live' if 'streamed' in time_text.lower()
@@ -2903,25 +2930,7 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                             if f.get('vcodec') != 'none':
                                 f['stretched_ratio'] = ratio
                         break
-
-        thumbnails = []
-        thumbnail_dicts = traverse_obj(
-            (video_details, microformats), (..., ..., 'thumbnail', 'thumbnails', ...),
-            expected_type=dict, default=[])
-        for thumbnail in thumbnail_dicts:
-            thumbnail_url = thumbnail.get('url')
-            if not thumbnail_url:
-                continue
-            # Sometimes youtube gives a wrong thumbnail URL. See:
-            # https://github.com/yt-dlp/yt-dlp/issues/233
-            # https://github.com/ytdl-org/youtube-dl/issues/28023
-            if 'maxresdefault' in thumbnail_url:
-                thumbnail_url = thumbnail_url.split('?')[0]
-            thumbnails.append({
-                'url': thumbnail_url,
-                'height': int_or_none(thumbnail.get('height')),
-                'width': int_or_none(thumbnail.get('width')),
-            })
+        thumbnails = self._extract_thumbnails((video_details, microformats), (..., ..., 'thumbnail'))
         thumbnail_url = search_meta(['og:image', 'twitter:image'])
         if thumbnail_url:
             thumbnails.append({
@@ -3584,7 +3593,6 @@ class YoutubeTabBaseInfoExtractor(YoutubeBaseInfoExtractor):
 
     def _extract_from_tabs(self, item_id, ytcfg, data, tabs):
         playlist_id = title = description = channel_url = channel_name = channel_id = None
-        thumbnails_list = []
         tags = []
 
         selected_tab = self._extract_selected_tab(tabs)
@@ -3603,26 +3611,13 @@ class YoutubeTabBaseInfoExtractor(YoutubeBaseInfoExtractor):
             description = renderer.get('description', '')
             playlist_id = channel_id
             tags = renderer.get('keywords', '').split()
-            thumbnails_list = (
-                try_get(renderer, lambda x: x['avatar']['thumbnails'], list)
-                or try_get(
-                    self._extract_sidebar_info_renderer(data, 'playlistSidebarPrimaryInfoRenderer'),
-                    lambda x: x['thumbnailRenderer']['playlistVideoThumbnailRenderer']['thumbnail']['thumbnails'],
-                    list)
-                or [])
 
-        thumbnails = []
-        for t in thumbnails_list:
-            if not isinstance(t, dict):
-                continue
-            thumbnail_url = url_or_none(t.get('url'))
-            if not thumbnail_url:
-                continue
-            thumbnails.append({
-                'url': thumbnail_url,
-                'width': int_or_none(t.get('width')),
-                'height': int_or_none(t.get('height')),
-            })
+        thumbnails = (
+            self._extract_thumbnails(renderer, 'avatar')
+            or self._extract_thumbnails(
+                self._extract_sidebar_info_renderer(data, 'playlistSidebarPrimaryInfoRenderer'),
+                ('thumbnailRenderer', 'playlistVideoThumbnailRenderer', 'thumbnail')))
+
         if playlist_id is None:
             playlist_id = item_id
         if title is None: