minor cosmetic changes to improve readibility

coub-dl.py

@@ -128,11 +128,13 @@ with open(FILES[File.LIST], 'w') as f:
     for i in range(timesLoop):
         print("file '{}'".format(shorterFile), file=f)
 
-# loop & mux
+# loop shorter stream
 print_opt('Looping shorter stream... ', end='', flush=True)
 call(('/usr/bin/env', 'ffmpeg', '-f', 'concat', '-i', FILES[File.LIST], '-c', 'copy', FILES[File.LOOP]),
      stdout=DEVNULL, stderr=DEVNULL)
 print_opt('Done!')
+
+# mux with audio
 print_opt('Muxing streams... ', end='', flush=True)
 call(('/usr/bin/env', 'ffmpeg', '-i', FILES[File.LOOP],
                                 '-i', FILES[Stream.AUDIO],