ISO/IEC 23009-9:2025

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Information technology - Dynamic adaptive streaming over HTTP (DASH) - Part 9: Redundant encoding and packaging for segmented live media (REaP)

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ISO/IEC 23009-9:2025

This document specifies formats for redundant encoding and packaging of live segmented media (REaP).

This document specifies:

  • formats for Interchangeable Live Media Ingest and stream announcement;
  • format and segmentation strategy to generate interchangeable segments;
  • formats for generating interchangeable media presentation descriptions or playlists;
  • formats for efficient cloud storage access and archiving of live segmented media;
  • a protocol for communicating media descriptor files and fragmented media between encoders and packagers.

REaP enables the following:

  • failover support and rejoining of distributed components in the workflow (see AnnexΒ E);
  • workflows for live with dynamic ad insertion (DAI) with a decisioning system;
  • workflows with digital rights management (DRM) and content protection;
  • Mixing file and live inputs.

This document specifies additional constraint to formats defined in ISO/IEC 14496-12, ISO/IEC 23009-1, ISO/IEC 23000-19 and IETF RFC 8216.

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