Managing 2.25 billion video ads monthly, BrightRoll challenges Hulu, YouTube and Tremor Media.
BrightRoll is first to offer high-definition video ads on Web sites.
Among all Web sites tracked by ComScore in March, Hulu scored the highest for the number of video ads displayed, with a total of 1.2 billion video ad impressions for the month.
Online video advertising firm, BlackArrow has raised an additional $20 million in funding.
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