Advertising platform Adap.tv has closed $13 million in Series B funding. The round was led by Spark Capital, along with Redpoint Ventures and Gemini Israel Fund. As part of the deal, Spark Capital’s Dennis Miller will join the company’s board of directors. Adap.tv’s total funding to date is now $23 million.

Adap.tv makes an ad platform called OneSource that allows online video content owners to access ads from a number of sources using a single interface. The service supports various formats including overlays and pre/post rolls. Partnerships with a large number of major content providers include Metacafe and Blip.tv.

Adap.tv has shifted its focus since we originally introduced them last fall. The service is now primarily an ad network optimization platform, providing access to most of the top ad networks, along with many smaller ones.