Editing MPEG transport stream (section)

===Packet identifier (PID)===
Each table or elementary stream in a transport stream is identified by a 13-bit packet identifier (PID). A [[Inverse multiplexer|demultiplexer]] extracts elementary streams from the transport stream in part by looking for packets identified by the same PID. In most applications, [[time-division multiplexing]] will be used to decide how often a particular PID appears in the transport stream.

{| class="wikitable"
|+ Packet identifiers in use
|-
! Decimal !! Hexadecimal !! Description 
|-
|0
|0x0000
|Program association table (PAT) contains a directory listing of all program map tables
|-
|1
|0x0001
|[[Conditional access]] table (CAT) contains a directory listing of all ITU-T Rec. H.222 entitlement management message streams used by program map tables
|-
|2
|0x0002
|Transport stream description table (TSDT) contains descriptors relating to the overall transport stream
|-
|3
|0x0003
|IPMP control information table contains a directory listing of all ISO/IEC 14496-13 control streams used by program map tables
|-
|4–15
|0x0004-0x000F
|Reserved for future use
|-
|16–31
|0x0010-0x001F
|Used by [[DVB]] [[metadata]]<ref name="PID used by DVB">{{cite book |url=http://www.etsi.org/deliver/etsi_en/300400_300499/300468/01.13.01_40/en_300468v011301o.pdf |page=20 |section=5.1.3 Coding of PID and table_id fields |series=EN |volume=300 468 |edition=v1.13.1 |title=Digital Video Broadcasting (DVB); Specification for Service Information (SI) in DVB systems |website=Etsi.org|year=2012 |access-date=2016-10-13}}</ref>
* 0x0010: NIT, ST
* 0x0011: [[Service Description Table|SDT]], BAT, ST
* 0x0012: EIT, ST, CIT
* 0x0013: RST, ST
* 0x0014: TDT, TOT, ST
* 0x0015: network synchronization
* 0x0016: RNT
* 0x0017-0x001B: reserved for future use
* 0x001C: inband signalling
* 0x001D: measurement
* 0x001E: DIT
* 0x001F: SIT
|-
|32-8186
|0x0020-0x1FFA
|May be assigned as needed to program map tables, elementary streams and other data tables
|-
|8187
|0x1FFB
|Used by [[DigiCipher 2]]/[[ATSC]] MGT [[metadata]]
|-
|8188–8190
|0x1FFC-0x1FFE
|May be assigned as needed to program map tables, elementary streams and other data tables
|-
|8191
|0x1FFF
|Null Packet (used for fixed bandwidth padding)
|}