Interaction between the devicesIf you already have one of the TV models that have HDMI 2.1 inputs, connected video sources must of course have the same functions. An example: The new television was advertised with the HDMI feature of dynamic HDR display (Dolby Vision or HDR 10+). But neither Dolby Vision nor HDR 10+ appear in the feature list of the Blu-ray player - hence no dynamic HDR feature. Even if the Blu-ray player and the television support Dolby Vision, the HDR enjoyment can ultimately fail if the AV receiver involved does not participate.