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Hypervideo
Hypervideo, or hyperlinked video, is a displayed video stream that contains embedded, user-clickable anchors,〔 allowing navigation between video and other hypermedia elements. Hypervideo is thus analogous to hypertext, which allows a reader to click on a word in one document and retrieve information from another document, or from another place in the same document. That is, hypervideo combines video with a non linear information structure, allowing a user to make choices based on the content of the video and the user's interests.
A crucial difference between hypervideo and hypertext is the element of time. Text is normally static, while a video is necessarily dynamic; the content of the video changes with time. Consequently, hypervideo has different technical, aesthetic, and rhetorical requirements than a static hypertext page. For example, hypervideo might involve the creation of a link from an object in a video that is visible for only a certain duration. It is therefore necessary to segment the video appropriately and add the metadata required to link from frames—or even objects—in a video to the pertinent information in other media forms.
==History of Hypervideo==
Illustrating the natural progression to hypervideo from hypertext, the software ''Storyspace'',〔(Storyspace: Storyspace )〕 a hypertext writing environment, employs a spatial metaphor for displaying links. ''Storyspace'' utilizes 'writing spaces', generic containers for content, which link to other writing spaces. ''HyperCafe'',〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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