ISO/IEC 13818-6:1998/Cor 1:1999

Overview

ISO/IEC 13818-6:1998/Cor 1:1999 is a Technical Corrigendum to Part 6 ("Extensions for DSM-CC") of the ISO/IEC 13818 family (MPEG-2 systems). Prepared by ISO/IEC JTC 1/SC 29, this corrigendum clarifies and corrects protocol semantics and message handling in the DSM-CC (Digital Storage Media - Command and Control) extensions used with generic coding of moving pictures and associated audio information.

Key topics and requirements

• StatusCount semantics
  The corrigendum changes the meaning of the StatusCount field in subclause 4.3. StatusCount is a 2‑byte field (0x0000–0xFFFF) that now explicitly indicates the number of status bytes returned in a status response. This clarification affects status reporting and parsing logic in DSM-CC implementations.

• Continuous Feed Session resource handling
  A clarified procedure in subclause 4.8.1.1 (Step 4) describes how a Server should connect a Client Session to an existing Continuous Feed Session:

  • The Server must request the Continuous Feed Session resource from the Network using the appropriate sessionId.
  • The Server may allocate or request additional resources exclusive to the Client Session in addition to those already assigned to the Continuous Feed Session.
  • If the Continuous Feed Session resource descriptor uses list encoding, the resource must be added via ServerAddResourceRequest.
  • If the descriptor uses single encoding, the resource may be added either in the ServerAddResourceRequest sequence or in the ServerSessionSetUpResponse.
  • If no additional Network-allocated resources are required, the flow skips further add-resource steps (i.e., proceed to step 7).

• Message-level clarifications
  The corrigendum refines the expected behavior of specific DSM-CC messages and resource descriptors - important for interoperable implementations.

Applications and users

This corrigendum is relevant to organizations implementing or testing DSM-CC extensions in MPEG-2 systems, including:

• Set-top box and STB middleware developers integrating DSM-CC session control
• Digital TV and multicast service providers using Continuous Feed Sessions
• Network equipment vendors implementing DSM-CC resource management (e.g., Server, Network components)
• Test labs and standards conformance teams validating message sequences (ServerAddResourceRequest, ServerSessionSetUpResponse)
• Standards bodies and technical authors maintaining DSM-CC profiles

Related standards

• ISO/IEC 13818-6:1998 (Part 6 - Extensions for DSM-CC) - base document for this corrigendum
• ISO/IEC 13818 series (MPEG-2 Systems) - broader context for packetized video/audio transport and control

Keywords: ISO/IEC 13818-6, DSM-CC, Technical Corrigendum, StatusCount, Continuous Feed Session, ServerAddResourceRequest, ServerSessionSetUpResponse, MPEG-2.