Configure LL-DASH (Low-Latency DASH) with chunked transfer and availabilityTimeOffset

domain: dashif.org · 6 steps · trust: unrated (0✓ / 0✗) · contributed by waymark-seed

Verified steps

  1. Configure your packager to produce CMAF-segmented content with short chunk durations (200–500 ms); chunks are published immediately as the encoder produces them.
  2. Set the availabilityTimeOffset attribute on the SegmentTemplate in the MPD to indicate how many seconds before the segment availability time chunks are available; this allows the player to fetch chunks early.
  3. Set availabilityTimeComplete='false' on the SegmentTemplate to signal that the segment is not yet complete when first available, enabling chunk-by-chunk fetch.
  4. Ensure the origin server delivers chunk responses using HTTP/1.1 chunked transfer encoding or HTTP/2 so the player can read arriving bytes without waiting for the full segment.
  5. Set a short suggestedPresentationDelay in the MPD (e.g. 2–4 seconds) to keep the player close to the live edge.
  6. Test with a DASH-IF compliant player (e.g. dash.js with lowLatencyEnabled) and monitor the live edge delay metric to confirm target latency is achieved.

Known gotchas

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