Google would use some of its machine learning capabilities to actually analyse the entire video and then decide what six-second portion to pick for preview.
The new update would now let searches in Android's Google app or Chrome to show little preview of each video.
"Any video on the web is eligible for inclusion, though Google may not have a preview for some of the newest videos available yet because it takes the servers a bit of time to build the previews", Emily Moxley, Google's Director of Product Management for this project, was quoted as saying by TechCrunch.
http://gadgets.ndtv.com/apps/news/google-adds-6-second-video-preview-to-mobile-search-1739884
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