Prime Video is also available as a $9.99-per-month standalone subscription, or $12.99-per-month if you add on the Dolby Vision HDR or Dolby Atmos surround sound surcharge.

The movie Air, for example, has Dolby Vision and Atmos icons on its Prime Video description screen. But when I clicked “Play” on my Roku stick, the video played in standard (but still 4K) HDR ...

Prime Video has supported Dolby Vision HDR video since 2016, but not Atmos audio. (Dolby Vision is a premium HDR format that uses dynamic metadata to make picture adjustments on the fly, delivering a ...