Reference Tools

Content Delivery Protocols

These tools address the application-layer delivery protocols that sit above the 5G transport, ensuring interoperability across content formats, packaging standards, and player implementations. The project is designed to support any delivery protocol; it currently implements FLUTE and ROUTE, used respectively for file and real-time object delivery over 5G Broadcast and 5G Multicast Broadcast Services (MBS). Useful for developers validating DASH/HLS players, packagers, and Content Delivery Network (CDN) integrations in 5G environments. For the architectures these transports plug into and the per-feature FLUTE audit, see Implementation Detail.

What's Built

4 repositories make up this project, listed below.

Repositories

The real code behind this project, with each repository's latest release.

Implementation Detail

Architectures, and a feature-by-feature FLUTE audit against TS 26.346.

Call to Try

Build and test it yourself, with the tutorials.

Developer Updates

Community stats, open pull requests and the roadmap.

Standards implemented

RFC 3926 (FLUTE)

RFC 9223 (ROUTE)

Implemented specifications: IETF RFC 3926/RFC 6726 (FLUTE) and RFC 9223 (ROUTE) — the transports the tools implement. DASH (ISO/IEC 23009-1), HLS (RFC 8216) and CMAF (ISO/IEC 23000-19) are the formats these transports carry as opaque segments and manifests, not something the tools implement themselves.

See Content Delivery Protocols on the Standards portal for the full specification list.

Contributors & How to Contribute

BBCFraunhofer FOKUSBig Blue MarbleMotion Spell+Become a Contributor

Repositories & Releases

CMMF Encoderrt-cmmf-encoder

IssuesPull RequestsReleases

Reference implementation of a CMMF Encoder according to ETSI TS 103 973.

StandardsETSILicense5G-MAG PL v1.0

FLUTE Protocol and Profilesrt-libflute

IssuesPull RequestsReleases

This is an implementation of a FLUTE server and client.

StandardsIETFRuns onLinuxLicense5G-MAG PL v1.0

Latest release: rt-libflute-0.12.4 · 2026-09-01 · 6w ago

Media Origin Server and Packagerrt-media-originEarly Access

IssuesPull RequestsReleases

A media origin server component for Content Delivery Protocols testing (JavaScript/TypeScript web application). No public description has been published on GitHub yet.

StandardsIETF3GPPETSIRuns onWebLicense5G-MAG PL v1.0

Reference Media Applicationrt-media-android-applicationEarly Access

IssuesPull RequestsReleases

An Android test app and a laptop test rig that check every delivery method of rt-media-origin arrives on a phone and plays as configured.

StandardsIETFRuns onAndroidLinuxDepends onrt-media-originLicense5G-MAG PL v1.0

Developer Updates

Last Synced: 2026-10-10 02:53 UTC

Repository	Stars	Forks	Views (Total)	Clones (unique per day)	Activity
rt-libflute	25	13	935	150	Active
rt-media-origin	0	0	26	3	Active
rt-media-android-application	0	0	1	1	Active
rt-cmmf-encoder	0	0	168	55	Active

Open Pull Requests

rt-media-originMerge development into main: radio channels, push transports and documentationReady#2 · 5d ago

rt-libflutedocs: apply the 5G-MAG README formatReady#113 · 1w ago

rt-cmmf-encoderdocs: apply the 5G-MAG README formatReady#2 · 1w ago

rt-libfluteWEBRC congestion control (RFC 3738), unverified: no conformance claimedDraft#98 · 7w ago

rt-libfluteTunnel-mode reception, and five object-handling fixes (compression, partitioning, transfer length)Ready#68 · 9w ago

rt-libfluteFLUTE version 2 (RFC 6726) signalling, off by default: step one of three, no conformance claimedReady#65 · 9w ago

rt-libfluteRFC 6330 RaptorQ FEC scheme (not 3GPP-mandated, offered as reference work)Ready#64 · 9w ago

This page links to the public roadmap boards tracking work on the content delivery protocol tools, including transport support for the Multimedia Broadcast Multicast Service (MBMS) delivery protocols ROUTE and FLUTE.

General Project Roadmap: the Kanban board below tracks the planned and in-progress work for Content Delivery Protocols (ROUTE and FLUTE transport support for the 5G Broadcast components). It is maintained live on GitHub.

Kanban board: Roadmap

Developer Kanban Boards:

• MBMS: Support for ROUTE — all issues and functionality around ROUTE support for the 5G Broadcast components: Kanban board
• MBMS: Support for FLUTE — all issues and functionality around FLUTE support for the 5G Broadcast components, including functionality like Forward Error Correction (FEC): Kanban board