%(upload_date)s for the upload date (YYYYMMDD),
%(extractor)s for the provider (youtube, metacafe,
etc), %(id)s for the video id and %% for a literal
-- percent. Use - to output to stdout.
++ percent. 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' .
--restrict-filenames Restrict filenames to only ASCII characters, and
avoid "&" and spaces in filenames
-a, --batch-file FILE file containing URLs to download ('-' for stdin)