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Check this out, it may be what you're looking for. https://dabble.me/cast
Here is Vgethttps://chrome.google.com/webstore/d...jaogciic?hl=en link
I'm not sure how Vget works but when I was viewing a page that the vidcast bookmarklet couldn't add casting to, Vget gives the option to cast it.
The vimeo video didn't work for me too... If you change your browser user agent to an android tablet/phone or possibly ios , I only tried android tablet, after it reloaded the UA it did work. But before I changed the user agent I clicked the Vget icon and it gave the option to cast the video in mp4 while video on the page was an flv I believe. So I think the Vget is able to check if the video url returns a proper format video for chromecast. Most sites video will play in formats according to the user agent presented.