From 4b9051cf39e5f967b0826871bb30b36889ca65fa Mon Sep 17 00:00:00 2001
From: compujo <2576634+compujo@users.noreply.github.com>
Date: Fri, 11 Dec 2020 15:12:31 -0500
Subject: [YoutubeDL] Improve thumbnails' filenames deducing (closes #26010)
 (#27244)

---
 youtube_dl/YoutubeDL.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/youtube_dl/YoutubeDL.py b/youtube_dl/YoutubeDL.py
index fdd68f616..6f477bc32 100755
--- a/youtube_dl/YoutubeDL.py
+++ b/youtube_dl/YoutubeDL.py
@@ -2410,7 +2410,7 @@ class YoutubeDL(object):
             thumb_ext = determine_ext(t['url'], 'jpg')
             suffix = '_%s' % t['id'] if len(thumbnails) > 1 else ''
             thumb_display_id = '%s ' % t['id'] if len(thumbnails) > 1 else ''
-            t['filename'] = thumb_filename = os.path.splitext(filename)[0] + suffix + '.' + thumb_ext
+            t['filename'] = thumb_filename = replace_extension(filename + suffix, thumb_ext, info_dict.get('ext'))
 
             if self.params.get('nooverwrites', False) and os.path.exists(encodeFilename(thumb_filename)):
                 self.to_screen('[%s] %s: Thumbnail %sis already present' %
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