1 files changed, 22 insertions, 0 deletions
diff --git a/yt_dlp/utils.py b/yt_dlp/utils.py
index be0c69d8f..87463c999 100644
--- a/yt_dlp/utils.py
+++ b/yt_dlp/utils.py
@@ -5271,6 +5271,28 @@ def join_nonempty(*values, delim='-', from_dict=None):
     return delim.join(map(str, filter(None, values)))
 
 
+def scale_thumbnails_to_max_format_width(formats, thumbnails, url_width_re):
+    """
+    Find the largest format dimensions in terms of video width and, for each thumbnail:
+    * Modify the URL: Match the width with the provided regex and replace with the former width
+    * Update dimensions
+
+    This function is useful with video services that scale the provided thumbnails on demand
+    """
+    _keys = ('width', 'height')
+    max_dimensions = max(
+        [tuple(format.get(k) or 0 for k in _keys) for format in formats],
+        default=(0, 0))
+    if not max_dimensions[0]:
+        return thumbnails
+    return [
+        merge_dicts(
+            {'url': re.sub(url_width_re, str(max_dimensions[0]), thumbnail['url'])},
+            dict(zip(_keys, max_dimensions)), thumbnail)
+        for thumbnail in thumbnails
+    ]
+
+
 def parse_http_range(range):
     """ Parse value of "Range" or "Content-Range" HTTP header into tuple. """
     if not range: