MPEG‑DASH and Dolby AC-4 overview Introduction about MPEG‑DASH and Dolby AC-4. MPEG Dynamic Adaptive Streaming over HTTP with ISO containers MPEG-DASH is an HTTP-based adaptive streaming technology that enables high-quality streaming of media content over the Internet. MPEG-DASH Media Presentation Description file A Media Presentation Description (MPD) file is a hierarchical XML document that provides information for an MPEG-DASH client about the available content for a media presentation. Raw AC-4 frame Each raw AC-4 frame is composed of a table of contents and at least one substream. Random access point The Dolby AC-4 decoder features a seamless switch between Dolby AC-4 elementary streams of the same media content and different configuration options.