dyndo dash

Generate a DASH MPD from an asset.json.

Synopsis

dyndo dash [OPTIONS]

Options

Description

dash reads the descriptor at --input, parses each track’s CMAF header to recover its segment index, and writes a static MPD to --output:

wrote stream.mpd

The manifest is type="static" (video on demand). Each track becomes a Representation inside an AdaptationSet for its content type (video, audio, or text), carrying a SegmentTemplate with a SegmentTimeline derived from the source’s sidx. Segment URLs use the $RepresentationID$ and $Time$ template variables — <id>/init.mp4 and <id>/<time>.m4s — matching the server’s segment routes.

Audio and text AdaptationSets carry a lang attribute, and tracks are grouped into sets by (sample entry, timescale, language, role) — the fields DASH requires to be uniform within a set. A track’s role becomes a Role descriptor (scheme urn:mpeg:dash:role:2011); the description and enhanced-audio-intelligibility audio roles additionally emit an Accessibility descriptor. A text track with no role defaults to Role@value="subtitle". See the Track roles reference for the exact mapping.

Text tracks appear in the MPD when their source is CMAF wvtt; raw .vtt sources are recorded in the descriptor but not yet advertised — on-the-fly chunking of raw WebVTT is still being wired up.

The --compact flag

Without --compact, every Representation carries its own SegmentTemplate. With it, a SegmentTemplate common to all representations in an AdaptationSet is written once at the set level, ahead of the representations. The rendered timeline is identical; only the structure and size differ.

The server always renders DASH in the compact form, so --compact makes the CLI output match what the server serves.

Examples

dyndo dash -i asset.json -o stream.mpd
dyndo dash -i asset.json -o stream.mpd --compact

See also

• Generate manifests without the server.
• dyndo hls — the HLS equivalent.