Nielsen ID3 User Manual page 66

ID3 Tag Validator Application User Manual
PID (Packet Identifier)
Each 188-byte transport packet in an MPEG-2 transport stream begins with a Packet Identifier (PID) that associates
the packet with a specific elementary stream, with a specific table, or with some other component of the transport
stream. MPEG-2 decoders use the PID to reassemble the interleaved transport packets into the component to which
they belong.
PMT (Program Map Table)
A component of an MPEG-2 transport stream that assigns a PID to all elementary streams in a specific program in
the transport stream. For example, the PMT might list the video elementary stream, the audio elementary stream, and
the metadata elementary stream. The PMT would assign a PID to each of these elementary streams.
PTS (Presentation Timestamp)
The Presentation Timestamp is the MPEG-2 feature that synchronizes the component elementary streams of the
elementary stream. The transcoder application is required to assign to the metadata PES packet the PTS of the audio
packet from which the most recent watermark was decoded. In the ID3 tag listing in the _tags.txt file, the PTS field
reports the PTS (converted to seconds) of the PES from which the ID3 tag was extracted.
S
sequence number
Each ID3 tag includes an integer sequence number, which starts at 0 when the PCM-to-ID3 SDK is first activated.
The sequence number increases by one each time a new tag is released. Both INFO and DATA tags are assigned
sequence numbers from the same continuum of integers.
SID (Source ID)
The SID (an integer) uniquely identifies the distribution source or content provider (the entity to which the viewing will
be credited). In the _tags.txt file, the second field of each EDU line identifies the SID of the watermark from which the
EDU was derived.
T
tag number
Indicates the ordinal position of the current ID3 tag among all of the tags in the detailed tag listing. It reflects the order
in which Validator extracted the ID3 tags from the metadata PES.
tag time
See ID3 tag time.
TIC (time in content)
For non-linear (file-based, VOD-type) content, the watermark timestamp field is filled with a value called a TIC (time in
content). A TIC is the same size (in bytes) as a clock-based timestamp, and, like a clock-based timestamp, it
advances by 1 second for every second of audio content that is processed. It does not directly relate to a clock time.
Its conversion to a date/time string, while possible, is not meaningful.
timestamp (watermark timestamp, audio code timestamp)
A component of the audio code that is a numeric representation of the date and time at which the watermark was
inserted into the stream. The NAES 2 and NAES 6 timestamps are measured from different epochs. Therefore, the
NAES 2 raw timestamp for a specific date and time is much larger than the NAES 6 timestamp for the same date and
Release 1.8 Revision F 65 Nielsen Confidential