[embedthumbnail] a little 'debug' statement got out of eyes.

youtube_dl/postprocessor/embedthumbnail.py

@@ -43,8 +43,6 @@ class EmbedThumbnailPP(FFmpegPostProcessor):
                 'Skipping embedding the thumbnail because the file is missing.')
             return [], info
 
-        self._downloader.to_screen("used format" + info['ext'])
-
         if info['ext'] == 'mp3':
             options = [
                 '-c', 'copy', '-map', '0', '-map', '1',