ISO/IEC 23009-9:2025

Overview - What ISO/IEC 23009-9:2025 (REaP) covers

ISO/IEC 23009-9:2025, part of the MPEG-DASH family, defines formats and workflows for redundant encoding and packaging of live segmented media (REaP). The standard specifies how live ingest, encoding, packaging and storage can be made interoperable and redundant so that independently deployed encoders and packagers can produce interchangeable segments and manifests. Key outcomes include robust failover, rejoining of distributed components, support for dynamic ad insertion (DAI), content protection (DRM) workflows, and mixed file+live inputs for live streaming and 24x7 archiving.

Key technical topics and requirements

• Interchangeable Live Media Ingest (I-MPD): formats for announcing and ingesting live streams so multiple encoders can produce the same segment timelines.
• Segment format and segmentation strategy: constraints to generate segments that are time-aligned and interchangeable across redundant encoders.
• Interchangeable media presentation descriptions (MPD/playlist): formats for D-MPD, HLS playlists and S‑MPD for storage to ensure consistent playback and replay.
• Encoder ↔ Packager protocol: a protocol for exchanging media descriptor files and fragmented media between distribution encoders and packagers.
• Asset storage and recording (S‑MPD): formats and track constraints for efficient cloud storage, 24x7 live archiving and retrieval.
• Synchronization mechanisms: use of synchronization time stamps (STS, E‑STS, P‑STS), recommended segment durations and methods for exchanging timing (see Annexes B, D, E, H).
• Constraints and interoperability: additional constraints on ISO BMFF/CMAF, DASH and HLS formats to guarantee interchangeable outputs across implementations.

Practical applications and who should use it

• Broadcasters and live-event producers seeking high-availability live streaming with failover and multi-site encoding.
• Streaming platform and CDN operators implementing consistent packaging and origin behavior for live feeds.
• Encoder and packager vendors building interoperable products that can join existing workflows and produce identical segments and manifests.
• Cloud storage and archive teams that require standardized S‑MPD and storage track formats for long-term recording and efficient access.
• Ad decisioning and DRM integrators enabling DAI and content protection across redundant delivery paths.

Related standards

• ISO/IEC 23009-1 (DASH MPD & segment formats)
• ISO/IEC 14496-12 (ISO base media file format / ISO BMFF)
• ISO/IEC 23000-19 (CMAF for segmented media)
• IETF RFC 8216 (HLS)

ISO/IEC 23009-9:2025 is essential reading for engineers and product teams who need resilient, interoperable live streaming workflows with standardized ingest, packaging, synchronization and archival formats. Keywords: ISO/IEC 23009-9:2025, DASH, REaP, redundant encoding, live segmented media, CMAF, MPD, HLS, DAI, DRM, cloud archiving.