W3C Media Working Group Repositories

The W3C Media Working Group maintains several repositories related to media technologies on the web, including specifications and tools for media playback, encryption, and streaming. These resources are crucial for developers working on web-based media applications.

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Related resources

• Encrypted Media Extensions (EME) — W3C Working DraftOfficial W3C spec for EME, the browser API for DRM-protected playback control (MediaKeys, encryptionScheme detection, getStatusForPolicy).
• CTA WAVE Technical Working GroupLive issue tracker and spec repo showing real working-group deliberation on WAVE/HbbTV/ATSC interoperability.
• SVTA LabsStreaming Video Technology Alliance GitHub org hosting spec implementations (Common Media Library, LiveSim2, Sandbox) under MIT license.
• Dolby.io Media APIs — Developer ToolsOfficial Dolby.io reference documentation for Media APIs developer tooling.
• IMSC 1.2 — TTML Profiles for Internet Media Subtitles and CaptionsLatest stable W3C spec text for IMSC 1.2, the base standard behind most subtitle delivery in streaming.
• MPEG-5 Standards Overview (EVC & LCEVC)Overview of MPEG-5 Part 1 (EVC) and Part 2 (LCEVC) codec standards with links to specifications.
• Video Coding Experts Group (VCEG)Overview of ITU-T's Video Coding Experts Group and its joint work with MPEG (JVET) developing codecs beyond VVC.
• MPEG Basics (Chiariglione)Explanation of MPEG standardization process and organizational structure by MPEG founder Leonardo Chiariglione.
• Disney Dolby Vision Best Practices Guide v1.3.1Official Disney mastering spec detailing Dolby Vision L0/L1/L2/L5/L6/L8 metadata layers and trim requirements per content type.
• Dolby Vision Overview (Technical PDF)Vendor-style technical overview of Dolby Vision mastering workflow covering PQ grading, CMU, and trim metadata.
• MovieLabs Production Technology SpecificationsConcrete specification documents (Ontology for Media Creation, Media Creation Cloud, security architecture) supporting the 2030 Vision for…
• HbbTV Reference ApplicationMIT-licensed reference DASH player with PlayReady/Marlin/ClearKey test material including cbcs streams, from the official HbbTV Association.
• SMPTE ST 2110 — Professional Media over Managed IP NetworksOfficial SMPTE standard page for ST 2110, the professional media-over-IP suite (2025 Emmy-winning standard with EBU and VSF).
• AIMS Alliance (Alliance for IP Media Solutions)Industry alliance driving adoption of open IP standards (SMPTE ST 2110, NMOS) for professional media infrastructure interoperability.
• MovieLabs 2030 VisionMajor studio-backed initiative defining cloud-native, software-defined media production workflows, ontology, and security architecture for…