Specifications

A-45

Cisco TV CDS 2.5 ISA Software Configuration Guide

OL-24788-01

Appendix A Troubleshooting

CDS Content Quality Guidelines

This section covers the following topics:

• Supported Elementary Stream Types

• Scrambling

• Transport Bit Rate

• Stream Length

• Format Restrictions

• Preferred Formats

Supported Elementary Stream Types

Video-only, audio-only (as well as audio streams with only a few or occasional video frames) and

data-only streams are supported in addition to the customary multiplex of both audio and video.

Scrambling

The transport layer cannot be scrambled, meaning the transport header and any adaptation field must be

in the clear. Streams whose Elementary Streams (ESs) are fully scrambled, including all start codes, are

capable of being ingested and streamed, but are incapable of trick play.

For trick-play capability, the following cannot be scrambled:

• Packetized Elementary Stream (PES) headers

• Program Association Table (PAT) and Program Map Table (PMT)

• Closed-caption data (if scrambled, the data is incorrectly included in tricks)

Transport Bit Rate

All transport streams are constant bit rate (CBR). Variable bit rate (VBR) is not supported. The

maximum bit rate is 35 Mbps. There is no minimum bit rate. The ES video bit rate, as specified in the

MPEG-2 sequence header, is ignored. The bit rates of individual ESs do not matter. The CBR for an

individual ES (in particular the video) is not required. All that is required is that the aggregate transport

stream be CBR.

Streams containing MPEG-2 or AVC video are expected to conform to the appropriate buffer models

spelled out in ISO/IEC 13818-1 and 14496-10.

Stream Length

All content must be at least one second in length. A content item must be under 12 hours in length or

15 GB, whichever comes first.