Language: TypeScript Maintainer: Eyevinn (Torbjörn Einarsson) GitHub: Eyevinn/warp-player Role: Browser player for CMSF media over MoQ, using MSE playback
Overview
Eyevinn’s TypeScript player for CMAF-packaged media delivered over MoQ. It consumes the CMSF streaming format and plays back through Media Source Extensions, which makes it the natural client-side counterpart to moqlivemock (the Go publisher and mlmtest interop client) and to the LOCMAF work Eyevinn co-authors.
It is one of the tracked repositories listed in this wiki’s schema, alongside moqlivemock and moqtransport.
Position in the Eyevinn MoQ stack
| Component | Language | Role |
|---|---|---|
| moqlivemock | Go | Live MoQ video+audio publisher + bundled subscriber; mlmtest interop client |
| warp-player | TypeScript | Browser CMSF player (MSE) |
| moqtransport | Go | MoQ Transport library (fork of mengelbart’s) |
| LOCMAF | — | Low Overhead CMAF draft (tobbe-einarsson + Hugo Björs) |
Status
Draft support: draft-18 only since v0.14.0 “draft-18 rewrite” (2026-08-31) — the breaking PR #190 “speak MoQ Transport draft-18 only” (+2,554/−4,245) dropped the legacy draft-14/16 paths, moving warp-player onto moq-transport draft-18 in lockstep with the rest of the Eyevinn stack (moqlivemock v0.14.0, moqtransport v0.11.1) ahead of the Sep-2 draft-18 interop hackathon. Prior tag: v0.13.1 (2026-08-29). Not separately registered in the interop-runner; Eyevinn’s runner presence is the moqlivemock / mlmtest client endpoint.
Latest: v0.16.0 (2026-09-29): subtitles. PR #198 (+3,362/−78) plays the catalog’s text subtitle tracks, CMAF and LOCMAF, in step with the picture. TTML is laid out by imscJS (as in dash.js) and WebVTT by the player’s own renderer. It also handles the experimental paint-model formats stpc and wvtc, chosen by the init segment’s sample entry. There is a Subtitles/CC selector (Off, CC1, or one subtitle track), with the CC button now a shortcut to it, and a side-by-side table of per-track bitrate and parse cost. The MSF catalog version may now be "1" as well as "draft-01", so a catalog that follows the draft’s own examples is no longer rejected. Pair it with moqlivemock v0.16.0, which publishes the paint-model tracks and a _locmaf variant of every subtitle track.
v0.15.0 (2026-09-16) — plays through a relay. PR #193 “discover namespaces with SUBSCRIBE_NAMESPACE and encode them as tuples” (+486/−43) fixed the two reasons the player could not work behind a relay: it only ever listened for PUBLISH_NAMESPACE (which a publisher volunteers but a relay does not — draft-18 §6.1 makes SUBSCRIBE_NAMESPACE the in-band discovery mechanism), and it encoded namespaces as a single slash-joined field instead of a real tuple. The player now sends SUBSCRIBE_NAMESPACE on connect (keeping the passive listener as a fallback, and reporting on screen when nothing arrives within 5 s), adds a “Namespace prefixes” filter field (comma-separated, blank = all; one request per prefix, since §10.18 rejects overlapping prefixes with PREFIX_OVERLAP), splits namespaces at the wire boundary via namespaceFields(), and fixed a Request-ID collision (TracksManager had counted IDs separately from Client). Meant to be paired with moqlivemock v0.15.0, whose namespaces carry an mlm publisher prefix. Verified in Chromium against mlmpub → mlmrel → player. See moqlivemock for the combined-stack narrative.