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-rw-r--r--youtube_dl/postprocessor/embedthumbnail.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/youtube_dl/postprocessor/embedthumbnail.py b/youtube_dl/postprocessor/embedthumbnail.py
index e19dbf73d..3bad5a266 100644
--- a/youtube_dl/postprocessor/embedthumbnail.py
+++ b/youtube_dl/postprocessor/embedthumbnail.py
@@ -40,7 +40,7 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
'Skipping embedding the thumbnail because the file is missing.')
return [], info
- if info['ext'] == 'mp3':
+ if info['ext'] in ('mp3', 'mkv'):
options = [
'-c', 'copy', '-map', '0', '-map', '1',
'-metadata:s:v', 'title="Album cover"', '-metadata:s:v', 'comment="Cover (Front)"']