DASH (dynamic adaptive streaming over HTTP), also called MPEG-DASH, is a technology used for media streaming over the web, commonly used for video on demand (VOD) and “replay/catch-up TV” services. The Media Presentation Description (MPD) is an XML document that lists the resources (manifest or “playlist”) forming a streaming service. A DASH client uses the manifest to determine which assets to request in order to perform adaptive streaming of the content. DASH MPD manifests can be used with content using different codecs (including H264, HEVC, AV1, AAC, VP9, MP4A, MP3) and containers (MP4, WebM, Matroska, AVI). There is a good explanation of adaptive bitrate video streaming at howvideo.works.
This commandline application allows you to download streaming video or audio to your local device. This involves selecting the alternative with the most appropriate encoding (in terms of bitrate, codec, etc.), fetching segments of the content using HTTP or HTTPS requests and muxing audio and video segments together. There is also support for downloading subtitles (mostly WebVTT, TTML, SRT, tx3g and SMIL formats, with some support for wvtt format). This application builds on the dash-mpd crate. It works for streaming that uses DASH adaptive streaming (MPD manifests), and doesn’t currently have support for HLS streaming (m3u8 manifests).
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