'%(extractor)s for the provider (youtube, metacafe, etc), '
'%(id)s for the video id, %(playlist)s for the playlist the video is in, '
'%(playlist_index)s for the position in the playlist and %% for a literal percent. '
+ '%(height)s and %(width)s for the width and height of the video format. '
+ '%(resolution)s for a textual description of the resolution of the video format. '
'Use - to output to stdout. Can also be used to download to a different directory, '
'for example with -o \'/my/downloads/%(uploader)s/%(title)s-%(id)s.%(ext)s\' .'))
filesystem.add_option('--autonumber-size',