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John Archer / Forbes:
Amazon’s Prime Video basic ad tier, which began on Jan. 29 in the US as a downgrade to subscribers, quietly cut Dolby Vision HDR and Dolby Atmos sound support — Amazon AMZN caused a furor recently when it announced that it was introducing advertisements right across its Prime Video streaming service.
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Source : http://www.techmeme.com/240212/p22#a240212p22