thumbnail_filename = info['thumbnails'][-1]['filename']
- if info['ext'] == 'mp3':
+ if not os.path.exists(encodeFilename(thumbnail_filename)):
+ self._downloader.report_warning(
+ 'Skipping embedding the thumbnail because the file is missing.')
+ return [], info
+
+ 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)"']