ANSI SCTE 67 pdf free download
ANSI SCTE 67 pdf free download.Recommended Practice for Digital Program Insertion for Cable.
In Figure 1 IDVS 839J, a compliant MPEG-2 transport stream (either Multi Program Transport Stream or Single Program Transport Stream) is assumed for the provider stream. No further constraints beyond the inclusion ofthe defined Cue Messages are placed upon the stream in SCTE 35.
SCTE 35 specites a technique for carrying notitication of upcoming splice points in the transport stream. A splice information table is defined for notifying downstream devices of Splice Events, such as a network Break or return from a network Break. The splice information table, which pertains to a given program. is carried in a separate PID referred to by that program’s Program Map Table (PMT). In this way, Splice Event notilication can pass through most transport stream remultiplexers without need for special processing. However, remultiplexers may need to obey certain constraints when they carry the Cue Message. These constraints are addressed in SCTE 35 and are elaborated on within this document.
SCTE 35 does not address constraints on splicing devices and SCTE 35 splice_info_table syntax and is not intended to guarantee seamless splicing.
By using PTS to reference In Points and Out Points in the program or component streams frame accurate splicing is possible. This document does offer some advice on how to properly encode or condition the video to aid this. While SCTE 35 does not require any stream conditioning, it can be advantageous to get the best splice results. SCTE 172 defines constraints on insertion materials at In Points and Out Points. SCTE 172 also provides suggestions on splicer behavior at In Points and Out Points
5.1. Example SCTE 35 Decoder
A sample java SCTE 35 decoder application written using the Netbeans framework is available (provided separately). It allows you to enter a Base64 or Hex string of the SCTE 35 mpeg section and will decode it with a printout of the data. It will also convert the Base64 or Hex to the opposite format. This is open source sample code and it does not have extensive error checking. It may he useful to understand how to properly parse a Cue Message. The SCTE website will be updated to list the SCTE 35 decoder beside the listing of the SCTE 67.
6. Application Guidelines
6.1. Practical Boundaries for splice_time() in splice_insert()
How far ahead of the splice must a splice_insert Message be sent. relative to the picture it refers to. in order to be safely responded to by an Ad Insertion System? SCTE 35 requires a minimum of 4 seconds of “pre-roll,” which is also termed “arm time.”
The “arm time” denotes the time a Cue Message precedes that actual insertion. The arm time is typically in the range of 5 – 8 seconds. This is in line with the pre-roll time ftr analog cue-tones. The arm time cannot be so short that the Avail passes by before the Ad Insertion System has time to respond. A minimum of 4 seconds is required for “start” Cue Messages (out_of_network_indicator = I) and a minimum of 4 seconds is recommended for “stop” Cue Messages (out_of_network_indicator = 0). It is not necessary to send a “stop” Cue Message if “Duration” is provided. Manufacturers should provide the option to generate a real time DTMF “stop” cue-tone at the actual switch point for legacy analog insertion systems.
More thought about the possible consequences is required if it is desirable to extend the arm time beyond the recommended eight seconds. To specify a maximum arm time therefore seems premature.
The splice_info_section itself does not have any P1’S or DTS value associated with it, as it is not a PES structure.
ANSI SCTE 67 pdf download.
