-r, --rate-limit LIMIT download rate limit (e.g. 50k or 44.6m)
-R, --retries RETRIES number of retries (default is 10)
--dump-user-agent display the current browser identification
- --user-agent None specify a custom user agent
+ --user-agent UA specify a custom user agent
--list-extractors List all supported extractors and the URLs they
would handle