The MPEG Data Stream - Digital Video and Audio Broadcasting Technology - page 78

exactly the same structure as in DVB SI and also have the same functional-
ity. The ARIB Standard thus also makes reference to ETSI 300468.

3.6 DMBT (China) Tables

China, too, have their own digital terrestrial television standard named
DMB-T - Digital Multimedia Broadcasting - Terrestrial. It can be as-
sumed that there is also an independent or modified or copied table of
comparable significance to DVB-SI but there have been no publications
regarding what modifications, if any, were made.

3.7 Other Important Details of the MPEG2 Transport
Stream

In the section below, other details of the MPEG-2 transport stream will be
discussed in more detail.
Apart from the sync bytes (synchronization to the transport stream) al-
ready mentioned, the transport stream error indicator and the packet identi-
fier (PID), the transport stream header also contains:

• the Payload Unit Start Indicator,
• the Transport Priority,

• the Transport Scrambling Control,

• the Adaptation Field Control, and

• the Continuity Counter.

The Payload Unit Start Indicator is a bit which marks the start of a pay-
load. If this bit is set, it means that a new payload is starting in this trans-
port stream packet: this transport stream packet contains either the start of
a video or audio PES packet plus PES header, or the beginning of a table
plus table ID as the first byte in the payload part of the transport stream
packet.

3.7.1 The Transport Priority

This bit indicates that this transport stream packet has a higher priority
than other TS packets with the same PID.