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[Tag] media:content [Description] Encloses information about the video. This tag contains many key attributes. The medium attribute specifies the type of content. This should be set to video. The url attribute specifies the direct URL to the raw video content. If this is not specified, you must specify the tag. The duration attribute specifies the length of the video in seconds. This is an optional but recommended attribute. For all of the other optional fields for the tag, see the mRSS specification. [Required?] 
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Alternate Markups for Videos   |   Webmasters   |   Google Developers