Video::isExternal() 

\nn\t3::Video()->isExternal($url = NULL); 

Checks whether the URL is an external video on YouTube or Vimeo. Returns an array with data for embedding.

\nn\t3::Video()->isExternal( 'https://www.youtube.com/...' );
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| @return array

Source Code 

public function isExternal ( $url = null )
{
	return $this->getExternalType( $url );
}
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