rg3/youtube-dl — pull request #3698 by MikeCol (2014-09-07 23:19:02+00:00)
Title: find video parameters in iframe

Some Tumblr sites seem to adopt a skin that puts the page with the video player and its parameters into a separate iframe.

This code kicks in if the "old way" fails.

The parameter format in this iframe is slightly different from the previous one.

Please note that the `default=""` in the new line 64 will suppress a previously present warning from `._search_regex` if no thumbnails are found.

I also added a test for a site currently using the iframe methode.