Today Tumblr announced the beta launch of in-stream auto-play ads with 11 brands including J.C. Penney, Hulu, Universal, and Unilever’s Axe products.

The new ad product comes a week after Tumblr unveiled its new video player. Tumblr’s sponsored video posts will play automatically in-stream on desktop and mobile platforms, with audio defaulting to mute.

In a statement, the company said its video posts are growing twice as fast as photo posts. That means the company’s new sponsored video posts could help it build advertising revenues.

Other partners include Lexus and television station CW. Tumblr says advertisers can expect the full service to roll out in mid-November.

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