HbbTV Specifications Library

Canonical index of all HbbTV core specifications and conformance test suites for hybrid broadcast-broadband TV applications.

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• AMWA IS-04 — NMOS Discovery and Registration SpecificationCanonical rendered spec for NMOS registration and query APIs used to discover senders/receivers in SMPTE ST 2110 IP production networks.
• CTA-5004: Common Media Client Data (CMCD) SpecificationThe canonical CTA specification defining CMCD keys and the HTTP header/query transport modes players use to report playback telemetry to CD…
• IAMF — Immersive Audio Model and Formats SpecificationAOMedia's specification for immersive/scene-based audio delivery, with v1.1.0 approved (base-enhanced profile) and v2.0.0 in draft.
• AMWA IS-05 — NMOS Device Connection Management SpecificationSpec for configuring sender/receiver connections in NMOS-managed IP video networks, sharing the IS-04 data model.
• draft-pantos-hls-rfc8216bis-22 — HTTP Live Streaming 2nd EditionCurrent HLS specification draft (protocol version 13, May 2026) that obsoletes RFC 8216, covering delivery directives and EXT-X-SERVER-CONT…
• EBU Tech 3373 — HLG UHDTV Colour Bar Test PatternsSpecification and downloadable TIFF/v210 HLG colour bar patterns for validating HDR production pipelines and 2SI signal paths.
• APV Codec Specification (IETF, now RFC 9924)IETF document track for the Advanced Professional Video codec, published as RFC 9924 in February 2026.
• Advanced HDR by Technicolor (SL-HDR1/2/3)Vendor home for the SL-HDR family (ETSI TS 103 433), which carries an SDR base layer plus reconstruction metadata for backward-compatible H…
• EBU TR 045 — Codec-Independent Next-Generation Audio WorkflowsEBU technical report arguing for open, codec-independent NGA production workflows and explaining the role of ADM in immersive/personalized…
• ATSC A/85 — Techniques for Establishing and Maintaining Audio LoudnessThe North American recommended practice for digital television audio loudness measurement and control, including loudness/true-peak quick r…