Fullscreen, the YouTube multichannel network whose backers include Comcast and Chernin Group, has acquired mobile-video startup Supernova, which was previously called Viddy.

Terms of the deal were not disclosed.

More than 40% of Fullscreen’s total viewership comes from mobile devices, compared with less than 10% just two years ago, according to founder and CEO George Strompolos.

“With the acquisition of Supernova, we are well-positioned to capitalize on this major shift in consumer behavior through rich mobile video content experiences,” he said in announcing the deal. “Perhaps most importantly, the Supernova team shares our vision to empower the connected generation of creators. We could not be more excited.”

Under the deal, Supernova’s 12 employees will join Fullscreen. For now Fullscreen intends to maintain the three apps developed by Supernova: Viddy, the startup’s original video-capture app; Clique, a Snapchat-like app for sharing photos anonymously within a group of friends; and Epic, for sharing slow-motion videos.