Editing MPEG-2 (section)

===Systems===
{{see also|MPEG program stream|MPEG transport stream}}

MPEG-2 Part 1 (ISO/IEC 13818-1 and ITU-T Rec. H.222.0<ref name="H.222.0">{{cite web |url=http://www.itu.int/rec/T-REC-H.222.0 |title=H.222.0 : Information technology - Generic coding of moving pictures and associated audio information: Systems |author=ITU-T |access-date=2010-06-03 |url-status=live |archive-url=https://web.archive.org/web/20120903192809/http://www.itu.int/rec/T-REC-H.222.0 |archive-date=2012-09-03 }}</ref><ref>{{cite web |url=http://www.itu.int/dms_pubrec/itu-t/rec/h/T-REC-H.222.0-200605-I!!SUM-HTM-E.htm |title=H.222.0 Summary |author=ITU-T |date=May 2006 |access-date=2010-06-03 |url-status=dead |archive-url=https://web.archive.org/web/20110519041216/http://www.itu.int/dms_pubrec/itu-t/rec/h/T-REC-H.222.0-200605-I!!SUM-HTM-E.htm |archive-date=2011-05-19 }}</ref>), titled ''Systems'', defines two distinct, but related, [[Digital container format|container formats]]. One is the ''transport stream'', a data packet format designed to transmit one data packet in four [[Asynchronous Transfer Mode|ATM]] data packets for streaming digital video and audio over fixed or mobile transmission mediums, where the beginning and the end of the stream may not be identified, such as [[radio frequency]], [[Electrical cable|cable]] and linear recording mediums, examples of which include [[ATSC]]/[[Digital Video Broadcasting|DVB]]/[[ISDB]]/[[SBTVD]] broadcasting, and [[HDV]] recording on tape. The other is the ''program stream'', an extended version of the [[MPEG-1#Part 1: Systems|MPEG-1]] container format with less overhead than ''transport stream''. ''Program stream'' is designed for random access storage mediums such as [[hard disk drive]]s, [[optical disc]]s and [[flash memory]].

''Transport stream'' file formats include [[M2TS]], which is used on [[Blu-ray]] discs, [[AVCHD]] on re-writable DVDs and [[HDV]] on [[compact flash]] cards. ''Program stream'' files include [[VOB]] on [[DVD]]s and [[Enhanced VOB]] on the short lived [[HD DVD]]. The standard MPEG-2 ''transport stream'' contains packets of 188 bytes. M2TS prepends each packet with 4 bytes containing a 2-bit copy permission indicator and 30-bit timestamp.

[[International Organization for Standardization|ISO]] authorized the "[[SMPTE]] Registration Authority, LLC" as the registration authority for MPEG-2 format identifiers. The registration descriptor of MPEG-2 transport is provided by ISO/IEC 13818-1 in order to enable users of the standard to unambiguously carry data when its format is not necessarily a recognized international standard. This provision will permit the MPEG-2 transport standard to carry all types of data while providing for a method of unambiguous identification of the characteristics of the underlying private data.<ref>[http://smpte-ra.org/mpegreg/mpeg.html SMPTE Registration Authority, LLC - registration authority for MPEG-2 format identifiers] {{webarchive|url=https://web.archive.org/web/20100128120057/http://www.smpte-ra.org/mpegreg/mpeg.html |date=2010-01-28 }} Retrieved on 2009-07-06</ref>