13. The electronic computing device of claim 8 , wherein the instructions to classify include instructions to classify a webpage as a video page when the webpage includes video player information and a footprint of the video player information included in the webpage indicates that the video player information is for playing video content other than an advertisement.
8. An electronic computing device for discovering and indexing online video content, the electronic computing device comprising at least one processor programmed to implement instructions to: crawl a plurality of webpages; classify each of the plurality of webpages as either a video page or a non-video page; aggregate ones of the plurality of webpages classified as a video page by the classifier; select ones of a plurality of domains based on respective domain importance rankings, each of the plurality of domains including at least one of the plurality of webpages classified as a video page; sample webpages of each of the selected ones of the plurality of domains; assign each of the sampled webpages to a respective one of a plurality of page groups of a respective one of the selected ones of the plurality of domains based on a layout and a visual pattern of each of the sampled webpages; analyze a structure of each of the selected ones of the plurality of domains to determine relationships among the plurality of page groups of each of the selected ones of the plurality of domains; generate hint information for guiding a deep crawling operation with respect to each of the selected ones of the plurality of domains based on attributes and relationships among the sampled webpages of each of the selected ones of the plurality of domains; and index video pages discovered during the deep crawling operation.