If you are interested in publishing video ads, you can apply through Google Video Advertising Solutions (Watch the video above). The publisher section is only made available to invite publishers who meet the following minimum requirements:
Use Flash player 7.0 or above
Viewership primarily based in the United States, English language
At least one million monthly video views
If you meet the qualifications apply here.
Official Google Blog: AdSense for video now in beta: "Google Video Advertising Solutions."
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