IEC 62481-2:2017

Overview

IEC 62481-2:2017 - Digital Living Network Alliance (DLNA) home networked device interoperability guidelines - Part 2: Media Format Profiles defines the media format requirements that enable reliable content sharing in DLNA home networks. Applicable to the DLNA Device Classes in IEC 62481-1-1:2017, this third edition standardizes Audio, Image and AV media classes, and introduces Profile ID values for media collections. It supersedes the 2013 edition with technical changes including removal of certain optional profiles, addition of mandatory profiles for the CVP‑2 Device Profile, and updates to resolve interoperability issues.

Key topics and technical requirements

• Media Format Profiles: normative profiles for Image (JPEG, PNG, GIF), Audio (MP3, AAC, AC‑3, DTS, LPCM, etc.) and AV (MPEG‑2, AVC/H.264, HEVC/H.265, VC‑1, WMV9).
• Profile structure and identifiers: unique Profile ID values to identify media items and media collections for consistent discovery and handling across devices.
• Mandatory vs Optional profiles: clear guidance on which profiles are mandatory for specific DLNA device categories (HND, MHD, CVP‑2) and which are optional, with updated rules (removal of some optional Audio/AV profiles and new mandatory CVP‑2 profiles).
• Interoperability model: guidance on media format support, profile parameter sets, media format overlap, transport alignment and audio rendering considerations.
• Profiling details: MIME type definitions, resolution/thumbnail conventions (e.g., JPEG_RES_<H>_<V>, JPEG_TN), ancillary chunk handling for PNG, and ID3/metadata tolerance for MP3 and other audio formats.
• Compatibility and conformance: recommended checks and behaviors to reduce format ambiguities and improve cross‑vendor playback reliability.

Practical applications and users

Who benefits:

• Consumer electronics manufacturers (smart TVs, set‑top boxes, Blu‑ray players)
• Networked media server/NAS vendors and mobile device OEMs
• Firmware and software developers implementing DLNA stacks and media renderers
• System integrators and QA labs performing interoperability testing
• Content distributors seeking predictable playback across DLNA ecosystems

Common use cases:

• Serving photos, music and video reliably from home NAS to TVs and AV receivers
• Ensuring thumbnails, metadata and transcoding behaviors are interoperable
• Certifying DLNA device profiles (including CVP‑2) for guaranteed media playback

Related standards

• IEC 62481-1-1:2017 (DLNA Device Classes and general guidelines)
• Relevant codec and container specifications such as MPEG, AVC/H.264, HEVC/H.265, JPEG and PNG standards (referenced within IEC 62481-2:2017)

IEC 62481-2:2017 is essential for anyone implementing or testing DLNA-compliant home network media devices who needs authoritative, practical rules for media format compatibility and robust interoperability.