rg3/youtube-dl — pull request #3426 by rupertbaxter2 (2014-08-03 14:45:23+00:00)
Title: Add --sleep-interval option to sleep between downloads during a batch process

Adds the option --sleep-interval (default 0)

Waits the specified number of seconds before downloading the next file in a batch. This is helpful for dealing with "503: Service Unavailable" errors that sometimes occur if one download is quickly started after the previous. I've seen this happen sometimes with vimeo channel downloads.