[ie/facebook] Improve thumbnail extraction (#9060)

Authored by: kclauhk

diff --git a/yt_dlp/extractor/facebook.py b/yt_dlp/extractor/facebook.py
index 84856abe1b07cd95053f6f7027db4113ccf0d68f..2fbdf1c37cad5b742a961e20374fa39bfef21b1d 100644 (file)
--- a/yt_dlp/extractor/facebook.py
+++ b/yt_dlp/extractor/facebook.py
@@ -682,6 +682,9 @@ def parse_attachment(attachment, key='media'):
                 # honor precise duration in video info
                 if video_info.get('duration'):
                     webpage_info['duration'] = video_info['duration']
                 # honor precise duration in video info
                 if video_info.get('duration'):
                     webpage_info['duration'] = video_info['duration']

+                # preserve preferred_thumbnail in video info
+                if video_info.get('thumbnail'):
+                    webpage_info['thumbnail'] = video_info['thumbnail']

                 return merge_dicts(webpage_info, video_info)
 
         if not video_data:
                 return merge_dicts(webpage_info, video_info)
 
         if not video_data: