tumblr supports copy&pasting links from a number of videos sites providing oembed json / xml files (youtube, vimeo, dailymotion) but seems to ignore others (screenr, ted.com) although those sites offer valid oembed files as well.
as there is no information in the tumblr docs / in their google group / on stackoverlow on this topic: what's the deciding factor? is there a whitelist of providers and if so, who is the person to get in touch with for getting on this whitelist?
many thanks!
p.s.: being an embed.ly provider (http://embed.ly/embed/features/providers) does not seem to be enough.