Media Presentation Description with Dolby AC-4 Use proper values in an MPD file to describe a Dolby AC-4 bitstream. Examples of MPD files for different scenarios are provided. Media Presentation Description An MPD can be used to describe media presentations with one or multiple Dolby AC-4 bitstreams. MPD for immersive stereo content To signal immersive stereo content in the MPD file, an additional SupplementalProperty descriptor must be included. Media Presentation Description file examples Example MPD files for different media presentations are provided.