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The spec currently says that the UA must ignore attempts to set media.currentTime when that media is assigned a mediastream. But the HTML spec says: "On setting, if the media element has a current media controller, then the user agent must throw an InvalidStateError exception" http://www.w3.org/html/wg/drafts/html/CR/embedded-content-0.html#dom-media-currenttime and a MediaStream assignment is similar on many other aspects to having a media controller, which suggests that trying to set currentTime should throw an InvalidStateError; that's also what Firefox currently does.
Resolved in 20130824 version of MediaCapture.