ANSI SCTE 138:2019 pdf download.Stream Conditioning For Switching Of Addressable Content In Digital Television Receivers.
The Switch from the Primary Channel to the Addressable Content Set and back to the Primary Channel is defined by several levels.
For “Level 0”, or “LO” systems, it defines Switching among compressed video and compressed audio streams in a non-seamless fashion (similar to a channel change).
For “Level 1”, or “L1” systems, it defines Switching among compressed video and compressed audio streams in a seamless fashion.
All LO or L1 Switches shall occur from a video stream to another video stream compressed using the same video codec. All LO or L1Switches shall occur from an audio stream to another audio stream compressed using the same audio codec.
1.2.1. Supported video and audio codecs
This standard supports the Ibliowing video and audio codecs:
• Video: MPEG-2, AVC, and HEVC.
• Audio: AC-3, E-AC-3. AAC, AC-4, MPEG-H Audio, DTS-HD, and DTS-UHD.
Readers of this standard will find references to other relevant standards in later sections of this document.
Section 2.1 SCTE References, section 2.2 Standards from Other Organizations and section 6 Standards
Compliance describe specific requirements for each of these codecs.
Codecs refered to in requirements defined by this standard arc specified in other sections of this document. For example, video Filler requirements and related standards for the AVC video codec can be found in section 8.4.1 AVC Video Filler.
Triggers and signaling are out of scope for this standard.
Note: Client-DPI Devices include Receivers conforming to OCAP as well as other cable-compatible Receivers.
1.3. Benefits
Client-DPI Devices will Switch to Addressable Content Sets either in the same multiplex as the primary Channel or in a new multiplex depending on the level. This standard ensures that conditioning occurs to properly formatted picture data and audio data in the transmitted Primary Channels and the Addressable Content Sets. This ensures that the Client-DPI Device will be able to acquire and begin decoding the new content without displaying any artifacts or losing any significant video or audio data. Without this conditioning, there would be visible artifacts during an addressable Client-DPI Device Switch.
1.4. Intended Audience
The intended audience for this standard is MVPDs, ad insertion equipment manufacturers, Client-DPI Device manufacturers, and addressable advertisement companies.
1.5. Areas for Further Investigation or to be Added in Future Versions
Areas for future consideration might include:
• Support for additional codecs beyond the ones included in this standard.
• Switches where there is a codec change in a Client-DPI Device implementation.
• Further consideration for C3/C7 rating periods.
2. Normative References
The following documents contain provisions, which, through reference in this text, constitute provisions of this document. At the time of Subcommittee approval, the editions indicated were valid. All documents are subject to revision; and while parties to any agreement based on this document are encouraged to investigate the possibility of applying the most recent editions of the documents listed below, they are reminded that newer editions of those documents might not be compatible with the referenced version.ANSI SCTE 138 pdf download.