[cleanup] Misc fixes

Closes #3565, https://github.com/yt-dlp/yt-dlp/issues/3514#issuecomment-1105944364

yt_dlp/postprocessor/embedthumbnail.py

@@ -79,9 +79,9 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
 
         original_thumbnail = thumbnail_filename = info['thumbnails'][idx]['filepath']
 
-        thumbnail_ext = os.path.splitext(thumbnail_filename)[1][1:]
         # Convert unsupported thumbnail formats (see #25687, #25717)
         # PNG is preferred since JPEG is lossy
+        thumbnail_ext = os.path.splitext(thumbnail_filename)[1][1:]
         if info['ext'] not in ('mkv', 'mka') and thumbnail_ext not in ('jpg', 'jpeg', 'png'):
             thumbnail_filename = convertor.convert_thumbnail(thumbnail_filename, 'png')
             thumbnail_ext = 'png'
@@ -100,7 +100,7 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
         elif info['ext'] in ['mkv', 'mka']:
             options = list(self.stream_copy_opts())
 
-            mimetype = 'image/%s' % ('jpeg' if thumbnail_ext in ('jpg', 'jpeg') else thumbnail_ext)
+            mimetype = f'image/{thumbnail_ext.replace("jpg", "jpeg")}'
             old_stream, new_stream = self.get_stream_number(
                 filename, ('tags', 'mimetype'), mimetype)
             if old_stream is not None:

yt_dlp/postprocessor/xattrpp.py

@@ -1,3 +1,5 @@
+import os
+
 from .common import PostProcessor
 from ..compat import compat_os_name
 from ..utils import (
@@ -28,6 +30,7 @@ class XAttrMetadataPP(PostProcessor):
         self.to_screen('Writing metadata to file\'s xattrs')
 
         filename = info['filepath']
+        mtime = os.stat(filename).st_mtime
 
         try:
             xattr_mapping = {
@@ -53,8 +56,6 @@ class XAttrMetadataPP(PostProcessor):
                     write_xattr(filename, xattrname, byte_value)
                     num_written += 1
 
-            return [], info
-
         except XAttrUnavailableError as e:
             raise PostProcessingError(str(e))
 
@@ -73,4 +74,6 @@ class XAttrMetadataPP(PostProcessor):
                 else:
                     msg += '(You may have to enable them in your /etc/fstab)'
                 raise PostProcessingError(str(e))
-            return [], info
+
+        self.try_utime(filename, mtime, mtime)
+        return [], info